Tarik Eljaddi  Oussama Kamal  El Houssine El Atmani  Imane Touarssi  Laurent Lebrun  Miloudi Hlaïbi 《加拿大化工杂志》2015,93(3):613-621

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Adel O. Al‐Amodi  Usamah A. Al‐Mubaiyedh  Abdullah S. Sultan  Muhammad Shahzad Kamal  Ibnelwaleed A. Hussein 《加拿大化工杂志》2016,94(3):454-460

Novel surfactant‐polymer (SP) formulations containing fluorinated amphoteric surfactant (surfactant‐A) and fluorinated anionic surfactant (surfactant‐B) with partially hydrolyzed polyacrylamide (HPAM) were evaluated for enhanced oil recovery applications in carbonate reservoirs. Thermal stability, rheological properties, interfacial tension, and adsorption on the mineral surface were measured. The effects of the surfactant type, surfactant concentration, temperature, and salinity on the rheological properties of the SP systems were examined. Both surfactants were found to be thermally stable at a high temperature (90 °C). Surfactant‐B decreased the viscosity and the storage modulus of the HPAM. Surfactant‐A had no influence on the rheological properties of the HPAM. Surfactant‐A showed complete solubility and thermal stability in seawater at 90 °C. Only surfactant‐A was used in adsorption, interfacial tension, and core flooding experiments, since surfactant‐B was not completely soluble in seawater and therefore was limited to deionized water. A decrease in oil/water interfacial tension (IFT) of almost one order of magnitude was observed when adding surfactant‐A. However, betaine‐based co‐surfactant reduced the IFT to 10^?3 mN/m. An adsorption isotherm showed that the maximum adsorption of surfactant‐A was 1 mg per g of rock. Core flooding experiments showed 42 % additional oil recovery using 2.5 g/L (2500 ppm) HPAM and 0.001 g/g (0.1 mass%) amphoteric surfactant at 90 °C.  相似文献   

    

Rajpal Girase  Rajendra Jaiswal  Lokesh Chaudhari  Subhendu Bhattacharya  Dawid D'Melo 《乙烯基与添加剂工艺杂志》2012,18(1):46-51

Unsaturated polyesters are widely used in a number of applications. However, they fall short in areas where high thermal stability and performance at higher temperatures are required. Previous investigations have studied the kinetics and degradation behavior of bismaleimide‐based unsaturated polyester composites. The current study aimed to investigate the effects of bismaleimide on the mechanical properties and thermal class of a bismaleimide unsaturated polyester composition. Addition of bismaleimide to the composition resulted in an increase in the thermal index of the material, thus making it useful in applications where high temperature stability is required. However, once degradation was initiated, the addition of bismaleimide had a detrimental effect on the stability of the composites. J. VINYL ADDIT. TECHNOL., 2012. © 2012 Society of Plastics Engineers  相似文献   

    

Sanjay V. Ingale  Pulya Umamaheswara&#x;Sastry  Pratap B. Wagh  Arvind K. Tripathi  Raghvendra Tewari  Vaisyappattu B. Jayakrishnan  Suhas B. Phapale  Pandugula T. Rao  Rajbal D. Wasnik  Bikas Bhattacharya  Satish C. Gupta 《Propellants, Explosives, Pyrotechnics》2013,38(4):515-519

RDX is preferred as explosive in munitions due to its balance of power and sensitivity that is known to be dependent on its particle size and size distribution. In this study, we prepared nano‐sized RDX in a silica xerogel matrix using a sol‐gel method and investigated its sensitivity for explosive properties. The presence of RDX in composite xerogel was confirmed by TG‐DSC and FTIR techniques. Microstructure and porosity were characterized by transmission electron microscopy (TEM), small angle X‐ray scattering, and N₂‐physisorption techniques. TEM results showed that the size of RDX particles in the RDX‐silica composites is in the range of 10–30 nm. The sensitivity to impact and friction was found to be higher for the composites compared to raw RDX. It was also found to be significantly dependent on the acetone/TMOS ratio used in the preparation.  相似文献   

    

M. A. Migahed  Ahmed A. Farag  S. M. Elsaed  R. Kamal  H. Abd El-Bary 《Chemical Engineering Communications》2013,200(11):1335-1356

A new family of nonionic surfactants was synthesized and evaluated as corrosion inhibitors for steel pipelines in oil well formation water. Polarization data show that the selected surfactants act as mixed-type inhibitors. EIS results show that the change in impedance parameters (R_t and C_dl) with the concentration of the surfactants studied is indicative of the adsorption of surfactant molecules on carbon steel surface, leading to formation of a good protective film. The properties of this film were studied by various surface analysis tools. Finally, the relation between the surface properties of the inhibitor molecules and corrosion inhibition efficiency is discussed.  相似文献   

    

Gautam Sarkhel  Amarnath Banerjee  Pinaki Bhattacharya 《Polymer-Plastics Technology and Engineering》2013,52(6):713-718

Melt rheology and mechanical properties of binary blend of low-density polyethylene (LDPE) and high-density polyethylene (HDPE) have been investigated. Four different wt fractions of blends containing LDPE/HDPE (20/80, 40/60, 60/40, and 80/20) were prepared. Cole-Cole plots [storage melt viscosity (η′) vs. loss melt viscosity (η″)] and relation between storage melt viscosity (η′) with frequency (ω) and blend composition were constructed. Miscibility of blends was established from rheological data. Impact strength of the blends increased with increasing LDPE concentration, whereas tensile strength shows the opposite trends. Percentages of the crystallinity of the blends were calculated by both the differential scanning calorimetry and wide-angle X-ray scattering methods, which show that the percentage of crystallinity decreased with increasing LDPE concentration, but the rate of crystallization of HDPE phase was unaffected.  相似文献   

    

Kamal I. Aly 《应用聚合物科学杂志》2012,123(6):3390-3401

A new interesting class of conducting polymer and copolymers based on 4‐teriary butyl‐cyclohexanone in the main chain has been synthesized by solution polycodensation of terephthalaldehyde with 4‐teriary butyl‐cyclohexanone and/or cycloalkanone derivatives. The model compound I was synthesized from the 4‐teriary butyl‐cyclohexanone with benzaldehyde, and its structure was confirmed by elemental and spectral analyses. The resulting polymer and copolymers were characterized by elemental and spectral analyses including Fourier transform infrared spectrometer (FT‐IR) and nuclear magnetic resonance (¹H‐NMR), beside solubility and viscometry measurements. The thermal properties of those polymer and copolymers were evaluated by thermogravimetric analysis (TGA) and differential scanning calorimeter (DSC) measurements and correlated to their structural units. X‐ray analysis showed that it has some degree of crystallinity in the region 2θ = 5–60°. The UV–visible spectra of some selected polymers were measured in dimethyl sulfoxide (DMSO) solution and showed absorption bands in the range 253–398 nm, due to n–π* and π–π* transition. The morphological properties of selected examples were tested by scanning electron microscope (SEM). Moreover, the electrical conductivities and the doping with iodine were tested. © 2011 Wiley Periodicals, Inc. J Appl Polym Sci, 2012  相似文献   

    

Manish Kamal  C. S. Sharma  Pradeep Upadhyaya  Vishal Verma  K. N. Pandey  Vijai Kumar  D. D. Agrawal 《应用聚合物科学杂志》2012,124(4):2649-2656

The present study was aimed to see the effect of surface treatment on nanocomposites with different fatty acids (stearic acid and oleic acid) having two different coupling agents (titanate and silane). Nanocomposites were prepared via melt mixing in Haake 90 twin screw extruder. The characterization of nanocomposites had been carried out using various advance analytical techniques such as dynamic mechanical analysis, thermogravimetric analysis, heat distortion temperature, melt flow index, and scanning electron microscopy. The strength and stiffness were also improved with the incorporation of maleic‐anhydride grafted ethylene propylene rubber in PP/Nano‐CaCO₃ nanocomposites. The tensile, flexural, and impact strength properties of PP/MA‐g‐EPR/treated‐CaCO₃ and untreated nanocomposites were determined. These studies revealed that stearic acid treated nanofiller filled composites had better properties than those of untreated and oleic acid treated nanofiller filled composites. The SEM studies demonstrated that the dispersion and distribution of Nano‐CaCO₃ (nCaCO₃) particles within the polypropylene matrix were dependent on the nature of surface treating agents. © 2011 Wiley Periodicals, Inc. J Appl Polym Sci, 2012  相似文献   

    

Sumanta Raha  Nhol Kao  Sati N. Bhattacharya 《Polymer Engineering and Science》2012,52(12):2559-2572

Styrene–ethylene/butylene–styrene (SEBS) copolymer was blended with the homopolymer polystyrene (hPS) in a counter‐rotating twin‐screw extruder to prepare hPS/SEBS blends. The morphology of the hPS/SEBS blends was studied by environmental scanning electron microscopy (ESEM) and by transmission electron microscopy (TEM). TEM imaging of pure SEBS revealed a microphase‐separated morphology, showing ordered regions or grains where the discrete styrene blocks formed hexagonally packed cylindrical structures within the ethylene/butylene matrix. Blending of small quantities of the homopolymer hPS showed an interesting result. The TEM images of the SEBS‐rich blends revealed that the added hPS was absorbed within the bulk of the SEBS phase resulting in a new SEBS‐rich phase, and the absorbed hPS was found to join the styrene cylinders of pure SEBS thereby modifying its original microstructure. As the hPS concentration in the blends was increased further, the ESEM and TEM images showed that the excess homopolymer hPS phase separated, forming a cocontinuous morphology with the hPS‐modified SEBS‐rich phases. Linear viscoelastic tests on the SEBS‐rich blends also revealed the existence of a synergistic effect, showing increased elastic behavior compared with that of pure SEBS. Small‐angle X‐ray scattering results showed an additional periodicity in the SEBS‐rich phase because of the modification of the SEBS microstructure by hPS. POLYM. ENG. SCI., 2012. © 2012 Society of Plastics Engineers  相似文献   

    

Yogesh  S. Haldar  P. Paul  A. Bhattacharya 《应用聚合物科学杂志》2010,115(6):3710-3715

The study in particular relates to a process for modifying surface of polymeric membrane and their biocidal activities. The modification process is based on absorption of 1, 3, phenylene diamine on the asymmetric polysulfone membrane and its diazo reaction. The azo compound (Bismarck brown) is characterized by LC‐mass, uv–vis spectra. The incorporation of azo compound into polysulfone asymmetric membrane is proved by ATR‐FTIR, SEM studies. The decrease in contact angle for modified surface proves the development of hydrophilic character. The modified membrane shows higher biocidal activity (for marine bacteria Vibrio sp.) compared to the virgin polysulfone membrane. The biofilm formation is inhibited for the modified membrane compared to virgin Polysulfone membrane. © 2009 Wiley Periodicals, Inc. J Appl Polym Sci, 2010  相似文献