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首页> 外文期刊>Journal of Applied Polymer Science >I-PP/HDPE BLENDS .3. CHARACTERIZATION AND COMPATIBILIZATION AT LOWER I-PP CONTENTS
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I-PP/HDPE BLENDS .3. CHARACTERIZATION AND COMPATIBILIZATION AT LOWER I-PP CONTENTS

机译：I-PP / HDPE混合.3。 I-PP含量较低时的表征和相容性

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The mechanical properties of high-density polyethylene (HDPE)-rich i-PP/HDPE blends were studied. Two grades of HDPE were investigated, one with a melt viscosity close to that of the polypropylene (PP) and the other having a much lower melt viscosity. Compatibilization of the 10/90 i-PP/HDPE blend with three copolymers (an ethylene/propylene/diene [EPDM] copolymer and two ethylene/vinylacetate [EVA] copolymers, differing in their VA content) was also investigated. Blends of PP with the low melt viscosity HDPE displayed poor mechanical properties. It was not possible to improve these properties sufficiently with EPDM or EVA. In the case where viscosity matching was achieved between PP and HDPE, addition of i-PP (up to 30%) to HDPE resulted in a large drop in the impact strength of the blends, compared to that of the neat HDPE. A large drop (>50%) was also observed in the ultimate tensile elongation. However, the flexural modulus, yield stress, and ultimate tensile strength all increased with the introduction of i-PP into HDPE. Modification of these blends with an EPDM resulted in the return of all properties to values very close to those of the neat HDPE. The ultimate tensile elongation of the EPDM-modified i-PP/HDPE blend even exceeded that of the virgin HDPE. It was also found that although EVAs can be used to compatibilize these blends these additives were not as effective as was the EPDM. (C) 1996 John Wiley & Sons, Inc. [References: 18]
机译：研究了富含高密度聚乙烯（HDPE）的i-PP / HDPE共混物的机械性能。研究了两种等级的HDPE，一种具有接近聚丙烯（PP）的熔体粘度，另一种具有低得多的熔体粘度。还研究了10/90 i-PP / HDPE共混物与三种共聚物（乙烯/丙烯/二烯[EPDM]共聚物和两种乙烯/乙酸乙烯酯[EVA]共聚物，它们的VA含量不同）的相容性。 PP与低熔体粘度HDPE的共混物显示出较差的机械性能。用EPDM或EVA不能充分改善这些性能。在PP和HDPE之间达到粘度匹配的情况下，与纯HDPE相比，向HDPE中添加i-PP（最多30％）会导致共混物的冲击强度大幅下降。在极限拉伸伸长率中也观察到大的下降（＞ 50％）。但是，随着将i-PP引入HDPE中，挠曲模量，屈服应力和极限拉伸强度都增加了。用EPDM对这些共混物进行改性，使所有性能恢复到非常接近纯HDPE的值。 EPDM改性的i-PP / HDPE共混物的极限拉伸伸长率甚至超过了原始HDPE的极限。还发现尽管可以使用EVA使这些共混物相容，但是这些添加剂不如EPDM有效。 （C）1996 John Wiley＆Sons，Inc. [参考：18]

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