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试验研究超细全硫化粉末NBR(UFPNBR)/EPDM共混物的硫化特性、相态结构、动态力学性能,加工性能及物理性能。UFPNBR粒子加入EPDM中明显影响了EPDM的硫化性能,UFPNBR/EPDM共混物采用过氧化物硫化体系硫化效果较好;透射电子显微镜和扫描电子显微镜观察表明,UFPNBR粒子在UFPNBR/EPDM共混物中始终为分散相,但在EPDM基体中没有分散成预期的纳米尺寸;动态力学热分析结果显示,共混物存在两个玻璃化温度,呈两相结构且界面结合较弱;橡胶加工分析仪分析结果表明,UFPNBR粒子在EPDM基体中形成了填料网络结构,使共混物的流动性能变差;UFPNBR对EPDM有一定补强作用,但补强作用不如传统的纳米无机填料。 相似文献
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着重研究了硫磺硫化体系对动态硫化聚丙烯/三元乙丙橡胶(PP/EPDM)共混物的性能的影响,分析了整个动态硫化的过程,并首次探讨了硫磺硫化体系在PP/EPDM共混物的动态硫化过程中的硫化机理。 相似文献
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MOS阻燃动态硫化PP/EPDM性能研究 总被引:2,自引:0,他引:2
结合碱式硫酸镁晶须(MOS)的补强和阻燃功能,以微胶囊红磷(MRP)为协效剂,制备了无卤阻燃型PP(聚丙烯)/EPDM(三元乙丙橡胶)/MOS/MRP共混物,并与PP/EPDM/Mg(OH)2/MRP共混物进行比较。氧指数(LOI)及垂直燃烧(UL-94)测试表明MOS的阻燃效果优于Mg(OH)2。力学性能测试表明,MOS对PP/EPDM热塑性雌性体具有一定的增强作用,PP/EPDM/MOS/MRP阻燃体系的力学性能明显优于PP/EPDM//MRP阻燃体系。而PP/EPDM热塑性弹性体的动态硫化进一步提高了PP/EPDM/MOS/MRP阻燃体系的力学与阻燃性能。 相似文献
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动态硫化EPDM/PP热塑性弹性体制备工艺研究 总被引:13,自引:0,他引:13
研究了不同硫化体系 ,硫化时间 ,硫化剂的用量 ,共混温度 ,橡塑比 ,填充炭黑和软化剂的用量对动态硫化 EPDM/ PP共混物性能的影响。研究结果表明 :酚醛硫化体系制得的 EPDM/ PP共混物加工性能和力学性较佳 ,硫化时间在 10~ 15 min,硫化剂的用量以完全交联 EPDM为宜 ,共混温度控制在 170℃~ 190℃ ,橡塑比 70 / 3 0~ 5 0 / 5 0 ,填充炭黑在 40份以内 ,软化剂在 2 0份以内较为理想 相似文献
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研究了三元乙丙橡胶/聚丙烯(EPDM/PP)共混物和动态硫化EPDM/PP热塑性弹性体(TPV)的等温结晶行为及形态结构,并用Avrami方程对其进行等温结晶动力学分析。结果表明,EPDM/PP共混物和EPDM/PP TPV的等温结晶行为符合Avrami方程,在相同的结晶温度下,TPV比共混物的Avrami指数小,半结晶时间短,结晶速率常数大;EPDM/PP共混物为双连续相结构,而EPDM/PP TPV是以硫化的细小橡胶颗粒为分散相、PP为连续相的"海-岛"结构,橡胶颗粒尺寸约为0.5μm。 相似文献
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采用极性化SBS(PSBS),通过熔融共混法制备了PSBS/PS/超细CaCO3补强热塑性弹性体,研究了该材料的加工流动性能和力学性能,对比了未处理和经分散活化处理的超细CaCO3对该材料性能的影响,并观察了材料的微观形态.结果表明,PSBS与PS共混,可有效提高加工流动性.PSBS/PS共混热塑性弹性体因两者"S"微区相容性好、PB段和PS段形成"物理交联区",使拉伸强度、弯曲强度随PS用量的增加而提高.超细CaCO3能有效提高PS-BS/PS的拉伸强度与弯曲强度,其中,添加经分散活化处理的超细CaCO3后的PSBS/PS的上述补强效果更好.当PS质量分数在30%~40%,超细CaCO3质量分数为25%~30%时,PSBS/PS/超细CaCO3补强热塑性弹性体的综合性能最为理想. 相似文献
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In attempts to improve the compatibility of polypropylene with polyethylene terephthalate, an acrylic acid functionalized polypropylene was evaluated as the blend component in polyblends containing 40 percent by weight polyethylene terephthalate and compared with an unmodified polypropylene. The preliminary experiments in a batch laboratory mixer were followed by compounding in a co-rotating twin-screw extruder. Additives such as magnesium acetate and p-toluenesulfonic acid were evaluated as catalysts for potential interchange or esterification reactions that could occur in the melt. The blends were characterized through scanning electron microscopy, infrared spectroscopy, differential scanning calorimetry, and for mechanical properties. The results show that the functionalized polypropylene promotes a fine dispersed phase morphology, improves processability and mechanical properties, and modifies the crystallization behavior of the polyester component. These effects are attributed to enhanced phase interactions resulting in reduced interfacial tension (calculated as a 4-fold decrease). The presence of the additives does not, in general, improve any further the blend morphology and properties, or its processability. 相似文献
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偶联剂与甘蔗渣/PVC复合材料性能的研究 总被引:7,自引:0,他引:7
分别用硅烷偶联剂KH560和钛酸酯偶联剂NDZ311对甘蔗渣/PVC复合体系进行处理。研究了两种处理方法对甘蔗渣/PVC复合材料力学性能、界面形态、耐水性能和加工性能的影响。结果表明,与未处理的相比,两种处理方法都改善了甘蔗渣和PVC之间的界面相容性,界面黏结得到增强,使复合材料的强度和韧性有了较大的提高,同时改善了甘蔗渣/PVC复合材料的加工性能。钛酸酯偶联剂处理对甘蔗渣/PVC复合材料性能的影响更为显著,当其用量为1%时,复合材料的拉伸强度和冲击韧性均得到提高,其中拉伸强度提高了55%。 相似文献
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Blends of a thermotropic liquid crystalline polymer, LCP, (4,4′-dicarboxy diphenyl ether modified poly(phenyl-1,4-phenylene terephthalate)) with polycarbonate and polysulfone were prepared and characterized with respect to their thermal properties, viscoelastic behavior, processability and mechanical properties. The processability of the thermoplastics was significantly improved by the addition of small amounts of LCP. This was also reflected by decreases in the steady shear viscosities, though the dynamic complex viscosities of the blends were generally similar or higher than those of the individual component polymers. Composite fibers were spun from the blends and the tensile moduli and strengths were consistent with a morphology of highly oriented LCP microfibrils with high aspect ratios dispersed in the thermoplastic fiber. The properties increased with increasing draw ratio. 相似文献
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P. Nevatia T. S. Banerjee B. Dutta A. Jha Amit K. Naskar Anil K. Bhowmick 《应用聚合物科学杂志》2002,83(9):2035-2042
Thermoplastic elastomeric compositions from reclaimed rubber and scrap plastics were prepared. The physical properties, dynamic mechanical properties, rheological behavior, and phase morphology of the blends were studied. A 50:50 rubber/plastic ratio was found to be the best for processability, ultimate elongation, and set properties. A sulfur‐accelerator system was found to be better than a peroxide system for dynamic crosslinking. © 2002 Wiley Periodicals, Inc. J Appl Polym Sci 83: 2035–2042, 2002 相似文献
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HDPE compounds containing various amounts of rigid (platy talc) or deformable (nylon-6) oxygen barrier components were blended in a twin-screw extruder and processed into thin films by blown film extrusion. The films were tested for oxygen permeability and mechanical properties and analyzed for morphology. Optimization of barrier component content is shown to depend on the desired permeability level, film ductility and processability. 相似文献
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Study on the morphology and properties of metallocene polyethylene and ethylene/vinyl acetate blends
Two commercial polymer materials, metallocene linear low density polyethylene (m‐LLDPE) and ethylene/vinyl acetate copolymer (EVA) have been used to form binary blends of various compositions. The mechanical properties, morphology, rheological behavior, dynamic mechanical properties, and crystallization of m‐LLDPE/EVA blends were investigated. It was found that with the addition of EVA, the fluidity and processability of m‐LLDPE were significantly improved, and the introduction of polar groups in this system showed no significant changes in mechanical properties at lower EVA content. As verified by morphology observation and differential scanning calorimetry analysis, miscible blends were formed within certain weight ratios. Dynamic mechanical property studies showed that flexibility of the blends was enhanced in comparion with pure m‐LLDPE, where the peak value of loss modulus shifted to lower temperature and its intensity was enhanced as EVA content increased, indicating the existence of more amorphous regions in the blends. © 2003 Wiley Periodicals, Inc. J Appl Polym Sci 91: 905–910, 2004 相似文献
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To extend the applications of wood–plastic composites (WPCs), soft WPCs were prepared with ethylene vinyl acetate (EVA) and wood flour (WF) as major components via a two‐step process involving two‐roll mixing and compression molding. The effect of the various factors, such as WF, unsaturated fatty acid (UFA), and dicumyl peroxide contents, on the mechanical properties, processability, and morphology of the WPCs was investigated in detail. The addition of UFA could effectively improve the processability and flexibility of the composites. The in situ grafting reaction between UFA and EVA considerably improved the adhesion of the WF and resin matrix. Consequently, soft WPCs with good performances in flexibility and processability were successfully obtained. © 2013 Wiley Periodicals, Inc. J. Appl. Polym. Sci., 2013 相似文献