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EFFECT OF SHORT CHAIN BRANCHING ON THE BLOWN FILM PROPERTIES OF LINEAR LOW DENSITY POLYETHYLENE

机译:短链分支对线性低密度聚乙烯吹塑薄膜性能的影响

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摘要

Three linear low density polyethylene (LLDPE) resins of similar melt index and density were synthesized with different comonomers in the Unipol pilot-plant scale reactor. The molecular structure, blown film morphology, and film strength properties of the resins have been comprehensively characterized. The film dart drop impact strength of the LLDPEs increases in the order of ethylene/1-butene, ethylene/1-octene, and ethylene/1-hexene copolymers; whereas the Elmendorf tear strength of them increases in the order of ethylene/1-butene, ethylene/1-hexene, and ethylene/1-octene copolymers. The mechanical properties seem to be highly associated with the length and distribution of short chain branches and, consequently, the lamellar thickness distribution of the resins. (C) 1996 John Wiley & Sons, Inc. [References: 34]
机译:在Unipol中试规模反应器中,使用不同的共聚单体合成了三种具有相似熔体指数和密度的线性低密度聚乙烯(LLDPE)树脂。树脂的分子结构,吹膜形态和膜强度性能已得到全面表征。 LLDPE的落镖冲击强度按乙烯/ 1-丁烯,乙烯/ 1-辛烯和乙烯/ 1-己烯共聚物的顺序增加;而它们的埃尔曼多夫撕裂强度按乙烯/ 1-丁烯,乙烯/ 1-己烯和乙烯/ 1-辛烯共聚物的顺序增加。机械性能似乎与短链支链的长度和分布高度相关,因此与树脂的层状厚度分布高度相关。 (C)1996 John Wiley&Sons,Inc. [参考:34]

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