Abstract

Polymer–polymer blends of ultrahigh-molecular-weight polyethylene (UHMWPE) and of low-molecular-weight high-density polyethylene (LMWPE) that contained 30, 50, and 80 wt % UHMWPE, were synthesized in a two-stage polymerization of ethylene over a rac-Me₂Si(Ind)₂ZrCl₂/methylalumoxane catalyst. The conditions of the stage were chosen based on the results of study of one-stage polymerization of ethylene in the temperature range 30–80°C. The order of introduction of the components to the UHMWPE/LMWPE or LMWPE/UHMWPE polymer blend was inverted by changing the sequence of the stages. The melting points and degrees of crystallinity of the polymer products were determined. The morphologies of the surfaces of the nascent particles of UHMWPE/LMWPE and LMWPE/UHMWPE blends were compared with scanning electron microscopy. The deformation and strength properties, abrasive wear resistance, and melt flow indices of the materials were studied as functions of the order of introduction of the components and the contents of the fractions in the polymer–polymer blends.

中文翻译：

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超高分子量聚乙烯和低分子量高密度聚乙烯的聚合物-聚合物共混物：合成，形态和性能

摘要

在乙烯的两步聚合中合成了超高分子量聚乙烯（UHMWPE）和低分子量高密度聚乙烯（LMWPE）的聚合物-聚合物共混物，其中共包含30、50和80 wt％的UHMWPE通过外消旋-我₂的Si（茚基）₂的ZrCl ₂/甲基铝氧烷催化剂。根据在30–80°C的温度范围内对乙烯进行一步聚合的研究结果，选择阶段的条件。通过改变阶段顺序，颠倒了将组分引入UHMWPE / LMWPE或LMWPE / UHMWPE聚合物共混物中的顺序。测定了聚合物产物的熔点和结晶度。用扫描电子显微镜比较了UHMWPE / LMWPE和LMWPE / UHMWPE共混物新生颗粒表面的形貌。研究了材料的形变和强度特性，耐磨性和熔体流动指数，作为组分引入顺序和聚合物-聚合物共混物中各组分含量的函数。