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首页> 外文期刊>Journal of Applied Polymer Science >Effect of dynamic crosslinking on tensile yield behavior of polypropylene/ethylene-propylene-diene rubber blends
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Effect of dynamic crosslinking on tensile yield behavior of polypropylene/ethylene-propylene-diene rubber blends

机译：动态交联对聚丙烯/乙烯-丙烯-二烯橡胶共混物拉伸屈服行为的影响

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摘要

Tensile yield behavior of the blends of polypropylene (PP) with ethylene-propylene-diene rubber (EPDM) is studied in blend composition range 0-40 wt % EPDM rubber. These blends were prepared in a laboratory internal mixer by simultaneous blending and dynamic vulcanization. Vulcanization was performed with dimethylol phenolic resin. For comparison, unvulcanized PP/EPDM blends were also prepared. In comparison to the unvulcanized blends, dynamically vulcanized blends showed higher yield stress and modulus. The increase of interfacial adhesion caused by production of three-dimensional network is considered to be the most important factor in the improvement. It permits the interaction of the stress concentrate zone developed at the rubber particles and causes shear yielding of the PP matrix. Systematic changes with varying blend composition were found in stress-strain behavior in the yield region, viz., in yield stress, yield strain, width of yield peak, and work of yield. Analysis of yield stress data on the basis of the various expressions of first power and two-thirds power laws of blend compositions dependence and the porosity model led to consistent results from all expression about the variation of stress concentration effect in both unvulcanized and vulcanized blend systems. Shapes and sizes of dispersed rubber phase (EPDM) domains at various blend compositions were studied by scanning electron microscopy. (C) 2000 John Wiley & Sons, Inc. [References: 37]
机译：在共混物组成范围为0-40 wt％EPDM橡胶的情况下，研究了聚丙烯（PP）与乙烯-丙烯-二烯橡胶（EPDM）的共混物的拉伸屈服行为。这些掺混物在实验室内部混合器中通过同时掺混和动态硫化来制备。用二羟甲基酚醛树脂进行硫化。为了比较，还制备了未硫化的PP / EPDM共混物。与未硫化的混合物相比，动态硫化的混合物表现出更高的屈服应力和模量。由三维网络的产生引起的界面粘附性的增加被认为是改进的最重要因素。它允许在橡胶颗粒处形成的应力集中区相互作用，并引起PP基体的剪切屈服。发现了随着共混物组成的变化，系统在屈服区域的应力应变行为，即屈服应力，屈服应变，屈服峰宽度和屈服功变化。根据共混物成分的一阶幂和三分之二幂定律的各种表达式以及孔隙率模型对屈服应力数据进行分析，得出所有有关未硫化和硫化共混体系中应力集中效应变化的表达式的一致结果。通过扫描电子显微镜研究了在各种共混物组成下的分散橡胶相（EPDM）域的形状和大小。 （C）2000 John Wiley＆Sons，Inc. [参考：37]

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