热致性液晶共聚酯／聚丙烯共混物

通过熔融共混制备了不同配比的（ＰＨＢ／ＰＥＴ）／ＰＰ共混物，研究表明，共混物的弯曲弹性模量，弯曲强度及拉伸强度均比ＰＰ有所提高，当液晶含量为１５％，ＰＰ－ｇ－ＭＡＨ为２０％时，（ＰＨＢ／ＰＥＴ）（ＰＰ－ｇ－ＭＡＨ）／ＰＰ三元共混物弯曲弹性模量最大，ＰＰ－ｇ－ＭＡＨ作为两相界面相容剂，改善了两相间的亲合性。ＤＳＣ分析表明，共混物中ＰＰ相的结晶温度有较大幅度的提高，（ＰＨＢ／ＰＥＴ）共聚酯起了ＰＰ结晶     

氯化乙丙橡胶胶增容PVC／SBS共混体系的研究

以氯化乙丙橡胶（ＣＥＰＤＭ）为相容剂,研究了ＳＢＳ对ＰＶＣ的共混增韧改性。结果表明ＣＥＰＤＭ能明显改善ＳＢＳ与ＰＶＣ的相容性,使共混物中ＳＢＳ颗粒尺寸明显减小,分布更均匀,共混物的ｔｇ内移,常常和低温下制品冲击强度增大。当ＰＶＣ／ＳＢＳ／ＣＥＰＤＭ为８０／２０／６（质量比）时,共混物的常温缺口冲击强度为５６．３ｋＪ／ｍ＾２,低温（－２０℃）缺口冲击强度为３２．４ｋＪ／ｍ＾２。     

透明PVC／MBS合金的研究

本文对不同型号的ＰＶＣ与ＭＢＳ进行共混改性,通过冲击,应力－应变试验,动态力学分析（ＤＭＡ）、扫描电镜（ＳＥＭ）和紫外可见光谱研究了ＰＶＣ／ＭＢＳ共混体系的性能与形态结构之间的关系。结果表明,用ＭＢＳ改性ＰＶＣ既能有效地提高共混物的韧性,又能保证其具有良好的透光率。     

PP／AS／DCP反应共混中SEBS的添加效应

研究了在聚丙烯（ＰＰ）／丙烯腈－苯乙烯共聚物（ＡＳ）／过氧化二异丙苯（ＤＣＰ）共混物反应挤出过程中添加热塑弹性体氢化（苯乙烯－丁二烯－苯乙烯共聚物）（ＳＥＢＳ）对ＰＰ／ＡＳ共混物降解的抑制效果对接枝反应的促进作用。对反应经物中ＰＰ相ＭＦＲ、红外测试及扫描电子显微镜与航向电子显微镜对共混物的观察结果表明,加入ＳＥＢＳ不但可以抑制反应共混中ＰＰ和ＡＳ的降解,而且可以大大促进反应共混中的接枝反应的进行,     

CPE对PVC／SBR共混体系增容作用的研究

通过微观冲击试验、动态力学分析（ＤＭＡ）、扫描电镜（ＳＥＭ）和透射电镜（ＴＥＭ）观察，研究了氯化聚乙烯（ＣＰＥ）增容的ＰＶＣ／丁苯橡胶（ＳＢＲ）共混物的性能与形态结构之间的关系。试验结果表明ＣＰＥ对ＰＶＣ／ＳＢＲ共混体系有良好的增容作用。     

相容剂在三元乙丙橡胶/聚酰胺共混物中的应用

以马来酸酐（ＭＡ）接枝三元乙丙橡胶（ＥＰＤＭ）（引发剂为一种橡胶促进剂）作为ＥＰＤＭ／聚酰胺（ＰＡ）共混物的相容剂。研究了相容剂接枝条件及用量，ＰＡ至共混物力学性能和耐溶剂性能的影响。当相容剂用量为ＥＰＤＭ的１４％（重量比）时，共混物的拉伸强度从４ＭＰａ提高到１２ＭＰａ，随相容剂用量的进一步增加，共混物的拉性能和耐溶剂性能得到进一步改善。ＤＳＣ分析表明，共混物是明显的多相体系，但通过多提试验发现有     

国外合成树脂及塑料文摘

每期文摘的题目均按汉语拼音顺序排列,英文按其字母顺序排列在汉字之前,数字开头的题目排在最前面。　　ＥＰＤＭ ＰＶＣ和ＭＭＡ ｇ ＥＰＤＭ ＰＶＣ共混物的动态力学分析、抗冲性及形态研究／Ｓｉｎｇｈ,Ｄ．（印度）／Ｊ．Ａｐｐｌ．ＰｏｌｙｍＳｃｉ1999,71（12）：1959～ 196 8（英文）。进行了乙烯—丙烯—二烯三聚物／聚氯乙烯（ＥＰＤＭ／ＰＶＣ）和甲基丙烯酸甲酯接枝ＥＰＤＭ橡胶（ＭＭＡ ｇ ＥＰＤＭ）／ＰＶＣ共混物的动态力学研究,抗冲阻抗及扫描电镜研究,ＭＭＡ的接枝含量分别为 4、13、2 1和 32 %。当Ｅ″曲线出现两个…     

辐射增强相界面反应改善PP／PE共混体系相间粘结的研究

采用三烯丙在异腈脲酸酯（ＴＡＩＣ）为多官能团单体,研究了ＰＰ／ＰＥ／ＴＡＩＣ共混体系的辐射增强相界面反应。应用ＳＥＭ、ＤＳＣ、ＤＤＶ对共混体系的形态结构和相容性进行了表征。结果表明,在ＰＰ／ＰＥ共混物中加入ＴＡＩＣ后,经＾６０Ｃｏγ射线辐照可以增强ＰＰ／ＰＥ共混物的相间粘结,共混物具有好的相容性,力学性能得到改善。     

丙烯酸多脂环（烯）酯与其均聚物的表面张力研究

本文采用滴体积法及Ｗｉｌｈｅｌｍｙ动态接触角测定法测定了丙烯酸双环戊烯基酯（ＤＣＰＡ）、丙烯酸三环戊烯基酯（ＴＣＰＡ）、丙烯酸异冰片酯（ＩＢＡ）、甲基丙烯酸正丁酯（ＢＭＡ）与其均聚物,以及氯化聚丙烯（ＣＩＰＰ）与聚苯乙烯（ＰＳｔ）的表面张力及其色散分量与极性分量;分别测定了水与ＣＨ２Ｉ２对聚合物ＰＤＣＰＡ、ＰＴＣＰＡ、ＰＩＢＡ、ＰＢＭＡ、ＣＩＰＰ与ＰＳｔ表面的动态接触角。以及ＤＣＰＡ、ＩＢＡ与ＢＭ     

PVF2／P（MM—St）共混体系的结晶性能和相容性的研究

用示差量热法（ＤＳＣ）、动态力学分析法（ＤＭＡ）和悬浮法测密度法研究了聚偏氟乙烯（ＰＶＦ２）／甲基丙烯酸甲酯与苯乙烯的无规共聚和［Ｐ（ＭＭＡ－Ｓｔ）］的共混体系的相容性和结晶性能。结果发现ＰＶＦ２／Ｐ（ＭＭＡ－Ｓｔ）共混体系是部分相容体系,其结晶性能随共混物中Ｐ（ＭＭＡ－Ｓｔ）的含量而变化,并就模压成型的热历史对该共混体系相容性的影响进行了讨论。     

Compatibility of waste rubber powder/polystyrene blends by the addition of styrene grafted styrene butadiene rubber copolymer: effect on morphology and properties

Waste rubber powder/polystyrene (WRP/PS) blends with different weight ratio were prepared with styrene grafted styrene butadiene rubber copolymer (PS-g-SBR) as a compatibilizer. The graft copolymer of PS-g-SBR was synthesized by emulsion polymerization method and confirmed through Fourier transform infrared spectroscopy (FTIR), differential scanning calorimetry (DSC). The copolymer at different weight ratio was subsequently added into the blends. The effects of weight ratio of WRP/PS and compatibilizer loading on mechanical properties were investigated. PS/WRP blends in a weight ratio of 80/20 showed higher impact strength. Moreover, the impact strength of the blend materials increased with the addition of SBR-g-PS, however, decreased at a high loading of the copolymer. The morphology and thermal properties of WRP/PS blends were examined by DSC, scanning electron microscopy (SEM), thermogravimetry (TG). DSC indicated that compared with PS/WRP blend, the glass transition temperature (T _g) of PS matrix phase in PS/WRP/SBR-g-PS blend shifted to low temperature because of the formation of chemical crosslinks or boundary layer between PS and WRP, and the T _g of WRP phase of both the PS/WRP and PS/WRP/SBR-g-PS blends did not appear. SEM results showed that interfacial adhesion in the blends with the PS-g-SBR copolymer was improved. The morphology was a typical continuous–discontinuous structure. PS and WRP presented continuous phase and discontinuous phase, respectively, indicating the moderate interface adhesion between WRP and PS matrix. TG illustrated that the onset of degradation temperature in the PS/WRP/PS-g-SBR blend decreased slightly by contrast with PS/WRP blend and the degradation of PS/WRP blends with and without SBR-g-PS was completed about at the same values.     

Compatibility and morphology studies of PPO multicomponent blends

The compatibility and phase morphology of poly(phenylene oxide) (PPO) multicomponent blends with poly(ethylene terephthalate) (PET) and polystyrene (PS) were studied using differential-scanning calorimetry (DSC), dynamic mechanical analysis (DMA), and scanning electron microscopy (SEM) methods. The effect of glycidyl methacrylate–styrene copolymer (GMS), as a compatibilizer, on the morphology of the PPO blends has also been studied in detail. The influence of the molecular weight of PET and the synergetic effect of the compatibilizers of GMS and phenoxy (PN) on the morphology were examined. The DSC and DMA results show that two distinct glass transitions corresponding to PET and PPO existed; however, the T_g of PPO shifts toward lower temperature region due to the addition of GMS and PS. The SEM results reveal that PET component exists as dispersed phases in the PPO matrix, while PS is miscible in the PPO matrix. A significant improvement of the compatibility was achieved for the PPO multicomponent blends because of the synergetic effect of GMS and phenoxy. © 1994 John Wiley & Sons, Inc.     

The Effect of Multiple Compatibilizers on the Impact Properties of Polypropylene/Polystyrene (PP/PS) Blend

Effects of compatibilizers on impact properties of polypropylene/ polystyrene (PP/PS) blends were studied and carried out through melt blending using co- rotating twin-screw extruder. A combination of two compatibilizers, maleic anhydride grafted polypropylene (PP-g-MA) and styrene maleic anhydride (SMA) was applied into PP/PS blends. Results from the Izod impact strengths, SEM observations and contact angle measurements in PP(50)/PS(50) blends indicated a better compatibilization effect with the use of dual compatibilizers. This was most probably due to improved adhesion between phases in PP/PS blend systems. The use of dual compatibilizers in the blend compositions produced higher impact properties in the PP/PS blend systems compared to single compatibilizer system.     

Compatibility and biodegradability of blendsof starch cinnamate with various polymers

The compatibility of blends of starch cinnamate (StCn) with polyvinyl chloride (PVC), polystyrene (PS), and styrene acrylonitrile copolymer (SAN) has been examined through viscometry at 30°C. The results of the three systems are compared with the already reported PMMA/StCn system. From the intrinsic viscosity, relative viscosity, reduced viscosity, and density measurements the PVC/StCn and SAN/StCn blends were found to be compatible while PS/StCn blend was found to be incompatible. The compatibility of the blends was also confirmed by SEM analysis. The compatibility of these blends based on heat of mixing and polymer-polymer interaction parameter was also examined. Blends were observed to be compatible on the basis of heat of mixing theory but not on the basis of polymer - polymer interaction parameters. Biodegradation studies of compatible blends containing 30% StCn showed 13%, 15%, 18%, and 23% weight loss in case of PMMA, SAN, and PVC blends after 120 days.     

Synthesis,characterization, and application of semi‐interpenetrating liquid crystalline polymer networks LCP/PS

Attempts to extend the IPN technology to liquid crystalline polymer (LCP) systems have been made in search for a new approach for enhancing the compatibility of liquid crystalline polymer with engineering thermoplastics. A new type of interpenetrating polymer network based on liquid crystalline polymer : semi‐interpenetrating liquid crystalline polymer network comprising liquid crystalline polymer PET/60PHB (LCP) and crosslinked polystyrene (PS) (for short: semi‐ILCPN LCP/PS) has been successfully prepared. The compatibility and thermal properties of the semi‐ILCPN LCP/PS with different amount of crosslinking agent were investigated by FTIR, SEM, DSC, and TGA, respectively. Furthermore, the possible application of the semi‐ILCPN LCP/PS as a new kind of compatibilizer in PPO/LCP blends was also studied and discussed. Well‐compatibilized PPO/LCP composites with considerably improved mechanical properties were obtained. © 2000 John Wiley & Sons, Inc. J Appl Polym Sci 76: 1141–1150, 2000     

Effect of compatibilizer on morphology and mechanical properties of TPU/SAN blends

Melt blends of thermoplastic polyurethane (TPU) and Poly(styrene‐co‐acrylonitrile), (SAN) of various compositions were prepared using a two‐roll mill. Two blends of composition 70:30 and 50:50 TPU/SAN were selected for compatibility studies. The compatibility effect of SMA on these incompatible blends was studied. The morphology and physical properties of blends were investigated using scanning electron microscopy (SEM), differential scanning calorimetry (DSC), Fourier transform infrared spectra (FTIR) and mechanical properties. TPU/SAN/SMA 70:30:5 showed better compatibility than other blend ratios.     

Polycarbonate blends with polystyrene and polypropylene

Blends of polycarbonate/polystyrene (PC/PS), polycarbonate/polypropylene (PC/PP) and ternary blends of the three components (PC/PS/PP) were studied. Extrudate swell of the molten blends increased with increasing concentrations of the minor components and leveled off at characteristic blend compositions. These compositions corresponded to the limits of compatibility as judged by the onset of brittleness in tensile tests. Both PS and PP appear to have some limited practical compatibility with PC. The change in extrudate swell behavior with concentration may be a rapid and convenient test for the effective concentration limits of partially miscible polymers.     

The compatibilizing effect of poly(styrene-co-4-vinylpyridine) copolymers on the polystyrene–polyethylene-based ionomer blends

The compatibilizing effect of styrene-co-4-vinylpyridine (SVP) random copolymers on the immiscible polystyrene (PS)–polyethylene-based ionomer (Surlyn) blends was examined by means of scanning electron microscopy (SEM), Fourier transform infrared (FTIR) spectroscopy, and tensile test. For the binary SVP–Surlyn and ternary PS–Surlyn–SVP blends, the domain size of dispersed phase decreases dramatically with the increase in the vinyl pyridine (VP) content of the SVP copolymers. The mechanical properties are improved with increasing the VP content in copolymers. FTIR results suggest that the compatibilization in this blend system is attributed to the ion–dipole interaction between the polar VP groups of SVP copolymer and ionic groups of Surlyn. © 1998 John Wiley & Sons, Inc. J Appl Polym Sci 69: 807–816, 1998     

Studies on polycarbonate/polystyrene/polycarbonate- graft-polystyrene blends. II. Compatibility and morphology of PC/PS/PC-g-PS blends

A radiation grafted copolymer of polycarbonate (PC) and polystyrene (PS) was used as a compatibilizer of PC/PS melt blends. The compatibility and morphology of PC/PS/PC-g-PS blends were studied by differential scanning calorimetry and scanning electron microscopy. As a consequence of the addition of PC-g-PS, the compatibility of PC/PS blends was improved; the dimensions of the dispersed phases and the interfacial tension between the two phases were reduced. Additionally, stabilization against gross segregation and interfacial adhesion of the blends were also improved by adding PC-g-PS as a compatibilizer. © 1998 SCI.     

The effect of UV‐irradiation and molten medium on the mechanical and thermal properties of polystyrene–polycarbonate blends

Polymer materials with improved properties can be obtained through polymer blends. As a polymer mixture is generally immiscible and incompatible, it is necessary to develop new methods to improve the interfacial adhesion. The aim of this work is to find formulations and associated processes to upgrade engineering polystyrene (PS) and polycarbonate (PC) polymer blends with the objective of using the best “process‐formulation” couple. In this study, blends of PS/PC were prepared in molten medium using reactive extrusion after UV‐irradiation. The effects of UV‐irradiation on some properties of blends under molten medium were investigated by differential scanning calorimetry (DSC), fourier transform infrared (FTIR), and thermogravimetric analysis (TGA). The data showed that the presence of polycarbonate in the blend increased the tensile strength and elongation at break with respect to pure PS. The mechanical properties of the blends were improved after irradiation. All irradiated blends are thermally more stable than those nonirradiated. Chemical changes can be clearly seen in FTIR spectra through two bands assigned to C?O and OH groups. The mutual influence between the PS/PC polymer blends compositions during UV‐irradiation was studied. PS and PC have different photo‐mechanisms due to the larger UV absorption of polystyrene and formation of more stable tertiary carbon radicals. © 2011 Wiley Periodicals, Inc. J Appl Polym Sci, 2012