Thermal and mechanical properties of thermoplastic urethanes made from crystalline and amorphous azelate polyols

Polyester polyols from renewable resources have gained significant interest in the field of polyurethane chemistry. Two sets of segmented TPUs were prepared from crystalline and amorphous azelate polyols, 4,4′-methylenebis(phenyl isocyanate), and 1,4-butanediol as a chain extender at a mole ratio of 1:2:1, respectively. Bio-1,3-propanediol (1,3-PDO) and 1,5-pentanediol (PTDO) were used to prepare crystalline azelate polyols, while 1,2-propanediol (1,2-PDO) and 2,2′-dimethyl-1,3-propanediol (NPG) were used to prepare amorphous azelate polyols. All TPUs displayed clear glass transition temperatures (T _gs) in between −36 and − 24 °C, associated with azelate polyols soft segments, which are decreasing with increasing diols chain lengths in azelate polyols. TPUs based on crystalline azelate polyols exhibited higher mechanical properties and better heat resistance in comparison to their counter parts. Besides, TPU based on 1,3-PDO azelate showed lower percentage of hysteresis indicating lower heat build-up. This is essentially good for TPUs that are to be used in dynamic applications such as rollers and wheels. Hence, the study on structure–property correlation of the crystalline and amorphous azelate polyols and their effect on TPUs properties suggest that crystalline azelate polyols are suitable for dynamic application of TPU, and amorphous azelate polyols are suitable for coatings and adhesives applications. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019 , 136, 47890.     

Synthesis and properties of polytriazoleimide containing anthracene,pyridine and 1, 2, 3‐triazole groups and their nanocomposites with titanium dioxide

A novel anthracene, pyridine and 1, 2, 3‐triazole containing diamine was synthesized by copper catalyst 1, 3‐dipolar cycloaddition of azides and alkynes groups (Click reaction). A series of polytriazoleimide (PTAI) nanocomposites were successfully prepared by condensation polymerization between the synthesized diamine monomer and commercially available pyromellitic dianhydride with different weight percentage of titanium dioxide (TiO₂). The structure of the monomer and polymer were confirmed by the fourier transform infrared and nuclear magnetic resonance spectroscopy. The synthesized PTAI is readily soluble in common polar solvents. The PTAIs naocomposites exhibited high thermal stability, the temperature corresponding to a 5% weight loss in the range of 495°C–555°C, excellent flame retardancy (char yield were found to be in the range of 48.1–66.4) and high glass transition temperature (T_g) at (267°C–294°C). Furthermore incorporation of TiO₂ into the PTAI matrix significantly improve the dielectric constant (2.70–4.75 at 1MHz) and dielectric loss (0.06–0.46 at 1 MHz). POLYM. ENG. SCI., 59:129–138, 2019. © 2018 Society of Plastics Engineers     

DMSO as solvent on the synthesis of flame-retardant polyether polyols

Polyether polyols with flame-retardant properties are synthesized using glycerol phosphate disodium salt as an initiator and dimethyl sulfoxide (DMSO) as a solvent. The molecular weight of the polyol decreased when higher solvent to initiator ratios were used, revealing that a larger amount of salt was activated. In addition, the larger the amount of activated salt was, the higher the percentage of phosphorous was in the final polyol. Glycerol phosphate disodium salt was still partially insoluble in the studied proportions of DMSO. Thus, the recovery and reuse of this part of the salt for the synthesis of new flame-retardant polyols were evaluated. The recovered salt promoted a shorter induction period because it presented a larger amount of deprotonated hydroxyl groups. In addition, there were no differences between both synthesized polyols, indicating that it is possible to use the recovered salt in the same way as it is used commercially with the advantage of a shorter induction period for polymerization. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019 , 136, 47042.     

Castor oil-based polyols with gradually increasing functionalities for biopolyurethane synthesis

In this research, castor oil-based polyols with gradual increasing functionalities were prepared using thiol-ene photo click reaction. The polyols were prepared by facile and efficient photo-click reaction using thiols with different number of hydroxyl groups. The polyols were successfully synthesized using a modified bio-oxygen demand (BOD) reactor and their structures were characterized. The hydroxyl number of the prepared polyols gradually increased depending on the thiol used for preparation. The increased hydroxyl number resulted in increased crosslinking densities for the prepared polyurethanes. The effect of the increasing crosslinking density and structure of the polyols on the mechanical and thermal properties of polyurethane were investigated. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019 , 136, 48304.     

Synthesis of polyhydric alcohol/ethanol phosphate flame retardant and its application in PU rigid foams

Two types of polyhydric alcohol/ethanol phosphates (PAEPs) were synthesized by a two‐step reaction using phosphorus oxychloride, ethanol, and polyhydric alcohol (glycerol and pentaerythritol). First, phosphorus oxychloride was reacted with ethanol to form a mixture of diethyl chlorophosphate and tri‐ethyl phosphate, and then PAEPs were prepared by the reaction between the above mixture and polyhydric alcohol. The chemical structures of PAEPs were characterized by ¹H NMR, and the elemental compositions were analyzed by X‐ray photoelectron spectroscopy (XPS). The degradation behavior of the PAEPs and their solubility in polyols were studied. The results indicated the PAEPs could be well dissolved in polyols. When PAEPs were used as flame retardant for PU rigid foams at a content of 8 wt %, the char residue of polyurethane foam at 800°C increased from 17.2 to 28% in average, and the peak heat release rate (pHRR) of polyurethane foam decreased significantly from 207 to 133 kW/m². In addition, PURF with PAEPs showed remarkable intumescent property. The results indicated that PAEPs were effective condensed phase flame retardant with char catalytic and intumescent property. © 2015 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2015 , 132, 42298.     

Preparation of high hydroxyl self-emulsifying polyester and compounding with acrylate

Waterborne saturated polyester (WSP) with high hydroxyl content was prepared through solution polymerization by using stepwise feeding and stage heating methods. The stability of polyester dispersion was enhanced in terms of molecular structure and polymerization process. The conditions of polymerization process, monomer types, and catalyst type were determined. The effects of the ratio of alcohol-to-acid, trimethylolpropane (TMP) content and the feeding method, the content of terminal monomer and branched monomer on the dispersion were investigated. The stability of the self-emulsifying polyester and the water resistance of the film were proved to be excellent. Through transesterification, waterborne unsaturated polyester (WUP) was synthesized by WSP. Polyester-acrylate composite emulsion can be obtained by physical blending or chemical copolymerization of synthetic waterborne polyester. The viscosity of the composite emulsion was improved, and the hardness and water resistance were improved. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2020 , 137, 48278.     

Study of catalytic activity of a polymer-supported Ce catalyst for the synthesis of biofuels and β-amino alcohol derivatives under ambient condition

A novel mesoporous cerium-incorporated anthranilic acid binded chloromethylated polystyrene (PS-AN-Ce) has been developed by functionalization of chloromethylated polystyrene with anthranilic acid in DMF medium, followed by grafting of cerium on its surface using CeCl₃·7H₂O. The synthesized PS-AN-Ce has been characterized by FESEM, EDAX, AAS, FTIR, UV–Vis, TGA, and N₂ adsorption–desorption isotherm. The synthesized material is stable up to 376 °C and the Brunauer–Emmett–Teller (BET) surface area is 40.12 m² g⁻¹. PS-AN-Ce showed excellent catalytic effectiveness with high conversion rate and high TOF in the synthesis of β-amino alcohol derivatives and esterification of fatty acids in a short reaction time. In addition, the synthesized catalyst is easy to remove from the reaction mixture by centrifugation as it is a heterogeneous catalyst in origin and can be reused up to six times without any major loss of its catalytic activity. Also leaching limit of the synthesized catalyst is studied in different reaction cycle which implies that leaching of cerium from its polymeric support is negligible to consider. The extremely dispersed and sturdily bound Ce sites in the Ce-incorporated mesoporous polymer could be responsible for the observed high catalytic activities. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019 , 136, 47650.     

Thermal stability and dynamic mechanical behavior of acrylic resin and acrylic melamine coatings

Acrylic polyols of different hydroxyl numbers consisting of hydroxy ethyl methacrylate, methyl methacrylate, butyl acrylate, and styrene were prepared by free‐radical solution as well as suspension polymerization techniques in the presence of benzoyl peroxide initiator. These polyols were crosslinked with butoxy methyl melamine at a ratio of 85 : 15 in the presence of acid catalyst. The thermal stability of polyols and their corresponding crosslinked films was studied by thermogravimetric (TG) technique. The Broido and Coats–Redfern methods were used to calculate the activation energy of thermal decomposition from standard TG curves. Dynamic mechanical thermal analysis was used to study the dynamic mechanical properties and determination of glass‐transition temperature of acrylic/melamine crosslinked films. The results indicate that the thermal stability of polyols and crosslinked films strongly depends on the hydroxyl number of the acrylic polyols. It was found that acrylic polyols synthesized by suspension polymerization methods upon crosslinking yield more thermally stable and flexible films than polyols prepared by solution polymerization methods. © 2003 Wiley Periodicals, Inc. J Appl Polym Sci 91: 27–34, 2004     

Fully biobased polyester polyols derived from renewable resources toward preparation of polyurethane and their application for coatings

Renewable resources such as isosorbide and dimer acid were used to prepare fully biobased polyester polyols and polyurethane (PU) coatings. The structural features of polyester polyols were studied by end-group analysis and spectroscopic methods. Then polyols were utilized in the preparation of PU coatings by reacting with diisocyanate. The prepared PU coatings were tested for both mechanical and chemical testings, which involved gloss, cross-cut adhesion, pencil hardness, anticorrosion performance by immersion and Tafel plot methods, and chemical resistance against water, solvent, and acid media. The prepared PUs were also tested for their thermal stability using a thermogravimetric analyzer and surface morphology by a scanning electron microscopy. Tested mechanical properties, chemical resistance, and thermal stability results demonstrated that the renewable sources used in the preparation of PU coatings can be good substitutes over petroleum resources. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019 , 136, 47558.     

In situ polymerization of flame retardant modification polyamide 6,6 with 2-carboxy ethyl (phenyl) phosphinic acid

A novel halogen-free flame retardant copolyamide 6,6 (FR-PA66) was prepared successfully by in situ polymerizing with adipic acid hexamethylene salt and 2-carboxy ethyl (phenyl) phosphinic acid (CEPPA). The elemental composition and chemical structure of FR-PA66 were characterized by energy dispersive X-ray spectroscopy, Fourier transform infrared spectrometer and ¹³C Nuclear magnetic resonance spectrometer. The flame retardancy, thermal stability, and morphology of char residues were also investigated by the limiting oxygen index (LOI), UL 94 test, thermogravimetric analysis, and scanning electron microscopy. The results showed that FR-PA66 samples had much better flame retardancy and char formation ability than pure PA66 after the flame retardant modification. The LOI values were increased from 24.0 to 28.0% by adding 6 wt % of CEPPA and all FR-PA66 samples were rated as V-0 rating in UL-94 test. Furthermore, the thermal stability analysis indicated that in situ polymerization with CEPPA effectively decreased the initial decomposition temperature and increased the amount of char residue. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019 , 137, 48687.     

Sustainable rigid polyurethane foams based on recycled polyols from chemical recycling of waste polyurethane foams

The preparation and characteristics of rigid polyurethane foams (RPUFs) based on recycled polyol obtained by glycolysis of waste RPUF scraps from end-of-life refrigerators were investigated. To deactivate the amine adducts derived from isocyanates, the recycled product obtained after depolymerization was chemically modified via addition polymerization of propylene oxide. Two kinds of recycled polyols with different hydroxyl values and viscosity were blended with conventional virgin polyether polyol to prepare the RPUFs. The effects of the recycled polyols on the physical properties of RPUFs such as cell structures, compressive strength, thermal conductivity, and limiting oxygen index were discussed. It was found that the RPUFs from recycled polyols showed superior compressive strength, thermal insulation property, and self-extinguishing property compared with conventional control foam. The results of this study reveal that the recycled polyols could be used as feedstock for RPUFs with superior performance. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019 , 136, 47916.     

Poly(1‐octene) synthesis using high performance supported titanium catalysts

Poly(1‐octene) was synthesized by polymerization of 1‐octene using high performance MgCl₂‐supported TiCl₄ in combination with triethyl aluminum (TEAl) as cocatalyst in n‐hexane for 2 h. Two catalysts, C₁ (diester catalyst) having di‐isobutyl phthalate as internal donor and C₂ (monoester catalyst) having ethyl benzoate as internal donor were utilized for the atmospheric polymerizations to evaluate the influence of structurally different internal donors on the productivity, rate of polymerization and molecular weight profiles. The kinetic profile assessed in terms of variation of reaction parameters like temperature, cocatalyst to catalyst molar ratio and monomer concentration was found to be dependent on them. From these kinetic analyses, optimize conditions for polymerizations of 1‐octene using diester as well as monoester catalyst were elucidated. The difference in the performance of diester and monoester catalyst system can be explained in terms of stability of active titanium species and chain transfer process. NMR spectroscopy of synthesized poly(1‐octene) indicate predominantly isotactic nature. © 2009 Wiley Periodicals, Inc. J Appl Polym Sci, 2010     

Fe/Zn double metal cyanide (DMC) catalyzed ring-opening polymerization of propylene oxide: Part 3. Synthesis of DMC catalysts

Double metal cyanide (DMC) complexes are effective catalysts for the ring-opening polymerization of propylene oxide. These catalysts are highly active and especially useful in the synthesis of polyether polyols having low unsaturation. In this paper, a family of DMC catalysts were synthesized and developed by reaction of aqueous solution of zinc chloride and potassium hexacyanoferrate with complexing agents to form a precipitate of DMC compounds. For obtaining favorable catalyst activity, the organic complexing agents such as t-butanol and polyols were employed. The complexing agents were incorporated into the catalyst structure and were required for active catalyst. The catalytic activity of the DMC complexes was significantly dependent on the composition of catalysts, feeding way and morphology structure of the DMC catalysts. The analytical method of DMC catalysts activity was also revealed.     

Properties of water‐blown rigid polyurethane foams with reactivity of raw materials

Rigid polyurethane foams (PUFs) were prepared from polymeric 4,4‐diphenylmethane diisocyanate (PMDI; having functionality of 2.9), polyether polyols, silicone surfactant, amine catalysts, and distilled water. The effects of reactivity on the properties such as density, compressive and flexural strength, and glass‐transition temperature (T_g) of the PUF samples were studied. The kinetic rate of forming the PUF samples was increased with the catalyst and water content. With increasing OH value and functionality of the polyols, the density and compressive strength of the PUF samples also increased. For the PUF samples synthesized with polyols having high functionality (>5), the flexural strength of the PUF samples decreased with the functionality of the polyols. With increasing OH value and functionality of the polyols, the T_g of the PUF increased because of an increase in the degree of crosslinking of the PUF samples. The T_g value and compressive strength of the PUF samples were observed to increase with the NCO index. From this result, it was suggested that the increase in the T_g value and compressive strength of the PUF samples may be attributable to the additional crosslinks that arose from allophonate and biuret formation by the supplementary reactions of excess PMDI. © 2004 Wiley Periodicals, Inc. J Appl Polym Sci 93: 2334–2342, 2004     

Synthesis and characterization of phosphonate and aromatic-based polynorbornene polymers derived from the ring opening metathesis polymerization method and investigation of their thermal properties

In the present study, phosphonate ester, phosphonic acid, and aromatic (phenyl, naphthalene, anthracene) groups containing polymers were synthesized by the ROMP method to analyze thermal properties of these polymers. Thermal stability of the synthesized polymers is tested by thermal gravimetric analysis under nitrogen, air, and microscale combustion calorimetry analysis. Analysis shows that thermal behavior is directly related to the phosphorus level in the copolymer series. All the polymers are thermally stable under nitrogen and air up to 900 °C. Synergistic charring effect under air was observed between aromatic groups and phosphonic acid functionality in the copolymer series. Anthracene units have a greater potential to form carbonaceous char than the naphthalene and phenyl units. Phosphonate ester and naphthalene units bearing copolymers (P3A) gave 8.13% char yield at 900 °C under air. Phosphonic acid derivatives of this polymer, P3D, gave a highest char residue of 17.15% under the same condition. The introduction of phosphonate and phosphonic acid in each copolymer series is also beneficial in reducing the peak heat release rate (PHRR). Cleavage of the phosphonate ester bearing homopolymer (P4) to phosphonic acid (P4A) causes a sharp decrease in the PHRR ratio from 274 to 28.2 W/g. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019 , 136, 47085.     

Bi-supported Ziegler–Natta TiCl4/MCM-41/MgCl2 (ethoxide type) catalyst preparation and comprehensive investigations of produced polyethylene characteristics

Bi-supported Ziegler–Natta catalysts (TiCl₄/MCM-41/MgCl₂ (ethoxide type)) were synthesized to improve the morphology and the properties of polyethylene. The morphology control is a crucial issue in polymerization process, while tailoring the properties of polymers is needed for specific applications. The catalysts were synthesized in different ratios of two supports with impregnation method. The polymerization process was carried out in atmospheric slurry reactor. The catalysts were characterized with scanning electron microscopy - energy dispersive X-ray spectroscopy (SEM–EDX), inductively coupled plasma, Fourier transform infrared spectrometry (FTIR), and Brunauer-Emmett-Teller (BET) methods. The polymers were analyzed with scanning electron microscopy (SEM), thermogravimetric analysis (TGA), differential scanning calorimetry, FTIR, and tensile-strength analyses. Ubbelohde viscometer and frequency sweep measurements showed that the synthesized polymers are ultra-high-molecular-weight polyethylene. Mechanical properties of polymers showed higher Young's modulus in samples containing MCM-41, having higher thermal stability supported by TGA analysis. SEM images of bi-supported catalyst showed a controlled spherical morphology with uniform size distribution. SEM analysis support that the polymers replicate their morphology from catalyst, improving their morphology comparing to MgCl₂-supported catalyst. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2020 , 137, 48553.     

Preparation and characterization of a novel transparent flame retardant unsaturated phosphate ester polymer

A novel unsaturated phosphate ester (UPE) was synthesized with triethyl phosphate (TEP), ethylene glycol (EG), and α‐methylacrylic acid (MAA). The unsaturated phosphate ester polymer (PUPE) was prepared by bulk polymerization of UPE. The structure of UPE and PUPE series were confirmed by Fourier transform infrared and liquid chromatography‐mass spectrometry (LC‐MS). Due to the chain transfer during polymerization, a crosslinked network was successfully introduced into the polymers, as evinced by the results from extraction and dynamic mechanical analysis. PUPE series exhibited high transparency, good mechanical properties, thermal properties, and excellent fire retardancy. The transmittance of PUPE‐3 was up to 92%; the tensile strength and impact strength were 14.62 MPa and 30.5 kJ m^?2, respectively. The tensile strength of PUPE series was increased from 1.7 MPa to 35.5 MPa while impact strength was decreased with the increase of MAA ratio. The char yield of PUPE series reached 29.07 wt% by thermogravimetric analysis testing, which indicated that PUPE had excellent charring ability at high‐temperature insulated air and prevented heat conduction. PUPE‐3 had two glass transition temperatures (T_g) (113°C/139°C) as the crosslinking interaction restricts the polymer chain motion, and successfully passed UL‐94 V‐0 flammability rating and the LOI value reached 32%. POLYM. ENG. SCI., 59:E425–E431, 2019. © 2019 Society of Plastics Engineers     

Phenolic resins with phenyl maleimide functions: Thermal characteristics and laminate composite properties

Phenolic resins bearing varying concentrations of phenyl maleimide functions were synthesized by copolymerizing phenol with N‐(4‐hydroxyphenyl)maleimide (HPM) and formaldehyde in the presence of an acid catalyst. The resins underwent a two‐stage curing, through condensation of methylol groups and addition polymerization of maleimide groups. The cure characterization of the resin by dynamic mechanical analysis confirmed the two‐stage cure and the dominance of maleimide polymerization over methylol condensation in the network buildup process. The kinetics of both cure reactions, studied by the Rogers method, substantiated the earlier proposed cure mechanism for each stage. Although the initial decomposition temperature of the cured resin was not significantly improved, enhancing the crosslink density through HPM improved thermal stability of the material in a higher temperature regime. The anaerobic char yield also increased proportional to the maleimide content. Isothermal pyrolysis and analysis of the char confirmed that pyrolysis occurs by loss of hydrocarbon and nitrogenous products. The resins serve as effective matrices in silica‐ and glass fabric–reinforced composites whose mechanical properties are optimum for moderately crosslinked resins, in which failure occurs through a combination of fiber debonding and resin fracture. © 2001 John Wiley & Sons, Inc. J Appl Polym Sci 80: 1664–1674, 2001     

Synthesis of a novel cross‐linked organophosphorus‐nitrogen containing polymer and its application in flame retardant epoxy resins

A novel cross‐linked organophosphorus–nitrogen polymetric flame retardant additive poly(urea tetramethylene phosphonium sulfate) defined as PUTMPS was synthesized by the condensation polymerization between urea and tetrahydroxymethyl phosphonium sulfate. Its chemical structure was well characterized by Fourier transform infrared (FTIR) spectroscopy, ¹³C and ³¹P solid‐state nuclear magnetic resonance. The synthesized PUTMPS and curing agent m‐phenylenediamine were blended into epoxy resins to prepare flame retardant epoxy resin thermosets. The effects of PUTMPS on fire retardancy and thermal degradation behavior of EP/PUTMPS thermosets were investigated by limiting oxygen index (LOI), vertical burning test (UL‐94), cone calorimeter measurement, and thermalgravimetric analysis (TGA) tests. The surface morphologies and chemical compositions of char residues for cured epoxy resins were investigated by scanning electron microscopy and X‐ray photoelectron spectroscopy (XPS), respectively. Water resistant properties of epoxy resin thermosets were evaluated by putting the samples into distilled water at 70°C for 168 h. The results demonstrated that the EP/12 wt% PUTMPS thermosets successfully passed UL‐94 V‐0 flammability rating and the LOI value reached 31.3%. The TGA results indicated that the incorporation of PUTMPS promoted epoxy resin matrix decomposed and char forming ahead of time, which led to a higher char yield and thermal stability for epoxy resin thermosets at high temperature. The morphological structures and analysis of XPS for the char residues of the epoxy resin thermosets shown that PUTMPS benefited to the formation of a sufficient, more compact, and homogeneous char layer with rich flame retardant elements on the materials surface during burning, which prevented the heat transmission and diffusion, limited the production of combustible gases, inhibited the emission of smoke, and then led to the reduction of the heat release rate and smoke produce rate. After water resistance tests, EP/12 wt% PUTMPS thermosets still remained excellent flame retardancy. Copyright © 2015 John Wiley & Sons, Ltd.     

Synthesis and Comparative Physico-chemical Study of Polyester Polyols Based Polyurethanes of Bisphenol-A and Bisphenol-C Epoxy Resins

Polyester polyols of epoxy resins of bisphenol-A and bisphenol-C were synthesized by reacting corresponding 0.02 mol epoxy resin, and 0.04 mol ricinoleic acid by using 1,4-dioxane (30 ml) as a solvent and 0.5 g triethyl amine as a catalyst at reflux temperature for 4–5 hr. Polyurethanes have been synthesized by reacting 0.0029 mol of polyester polyols with 0.004 mol toluene diisocyanate at room temperature and their films were cast from solutions. The formation of polyester polyols and their polyurethanes are supported by IR spectral data (1732.9–1730.0 cm^?1 ester and urethane and 3440.8–3419.6 cm^?1 OH and NH str). The densities of polyurethane of bisphenol-A (PU-A) and polyurethane of bisphenol-C (PU-C) were determined by a floatation method. The observed densities of PU-A and PU-C are 1.2190 and 1.2308 g/cm³, respectively. Slightly high density of PU-C is due to structural dissimilarity of two bisphenols. The tensile strength, electric strength, and volume resistivity of PU-A and PU-C are 34.7, 18.7 MPa; 80.7, 44.4 kv/mm; and 1.7 × 10¹⁵, 2.2 × 10¹⁵ ohm cm, respectively. PU-A and PU-C are thermally stable up to about 182–187°C and followed three step degradation. Incorporation of cyclohexyl cardo group in polyurethane chain did not impart any change in thermal properties but it caused drastic reduction in tensile and electric strength due to rigid nature of PU-C chains. PU-C has excellent chemical resistance over PU-A. Both polyurethanes possess good resistance against water, 10% each of aqueous acids (HCl, HNO₃, and H₂SO₄), alkalis (NaOH and KOH) and NaCl. Good thermo-mechanical, excellent electrical properties, and good chemical resistance of polyurethanes signify their usefulness in coating and adhesive, electrical and electronic industries.