Polymerisation and structure-property relationships of Ziegler-Natta catalysed isotactic polypropylenes

被引：14

作者：

Harding, Gareth W. ^{[1
]}

van Reenen, Albert J. ^{[1
]}

机构：

[1] Univ Stellenbosch, Dept Chem & Polymer Sci, ZA-7602 Stellenbosch, South Africa

来源：

EUROPEAN POLYMER JOURNAL | 2011年 / 47卷 / 01期

关键词：

Microhardness; Polypropylene; Structure-property; TREF;

D O I：

10.1016/j.eurpolymj.2010.10.019

中图分类号：

O63 [高分子化学（高聚物）];

学科分类号：

070305 ; 080501 ; 081704 ;

摘要：

Polypropylene homopolymer samples were prepared with a Ziegler-Natta catalyst using two different external donors namely diphenyldimethoxysilane (DPDMS) and methylphenyldimethoxysilane (MPDMS) Each donor was used in varying molar ratios to the catalyst in order to prepare samples for physical testing The polymers were fully characterised and also fractionated by preparative TREF with characterisation of the fractions In terms of the polymerisation reactions the DPDMS external donor exerts greater influence at the active sites than the MPDMS and produces polymer of higher molar mass and lower polydispersity The physical properties of the polymers were investigated using microhardness measurements It is revealed that the microhardness is strongly dependent on the stereoregularity of the samples (c) 2010 Elsevier Ltd All rights reserved

引用

页码：70 / 77

页数：8

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