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首页> 外文期刊>Polymer: The International Journal for the Science and Technology of Polymers >Rheology, phase morphology, mechanical, impact and thermal properties f polypropylene/metallocene catalysed ethylene 1-octene compolymer blends
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Rheology, phase morphology, mechanical, impact and thermal properties f polypropylene/metallocene catalysed ethylene 1-octene compolymer blends

机译：聚丙烯/茂金属催化的乙烯1-辛烯共聚物共混物的流变，相形态，机械，冲击和热性能

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摘要

Blends of a polypropylene (PP) and a metallocene catalysed ethylene-octene copolymer (EOC) were prepared using a single screw extruder fitted with a barrier screw design. The EOC used had 25 wt% 1-octene content and the weight fraction of EOC in the blends covered the range 1-30 wt.% Viscosity values for the blends determined experimentally from dual capillary rheological studies were similar to those calculated theoretically using the log additivity principle described by Ferry. This results together with scanning electron microscopy (SEM) observations and evidence from tan #delta# curves from dynamics mechanical thermal analysis showed PP and EOC to be partially miscible for blends having 10 wt% EOC or less. The tensile modulus, break strength and flexural modulus of the blends decreased with respect to virgin PP as the weight fraction of EOC was increased to 30 wt.% The diminution in mechanical properties was concomitant with an initial increase in elongation at break from 40% for neat PP 140% for the blend with 15 wt% EOC before decreasing to 65% when 30 wt% EOC was blended. The optimum impact modification of the PP used in this study, in the temperature range -40 to 23 deg C, was achieved by blending with between 20 and 30 wt% EOC.
机译：使用装有阻挡螺杆设计的单螺杆挤出机制备聚丙烯（PP）和茂金属催化的乙烯-辛烯共聚物（EOC）的共混物。所用的EOC具有25 wt％的1-辛烯含量，并且共混物中EOC的重量分数覆盖1-30 wt％的范围。根据双毛细管流变学研究实验确定的共混物的粘度值与使用log Ferry描述的可加性原理。该结果与扫描电子显微镜（SEM）观察结果以及来自动态力学热分析的tan＃delta＃曲线的证据表明，PP和EOC对于EOC含量小于或等于10 wt％的混合物是部分可混溶的。相对于纯PP，共混物的拉伸模量，断裂强度和挠曲模量随着EOC的重量分数增加至30％（重量）而降低。机械性能的降低伴随着断裂伸长率的初始增加，从40％降低到40％。与15 wt％EOC混合时，纯PP为140％，然后再混合30 wt％EOC时降低到65％。通过在20至30 wt％的EOC中掺混，可以在-40至23摄氏度的温度范围内实现本研究中所用PP的最佳抗冲改性。

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