热水管材用乙烯-丙烯无规共聚树脂的结构表征  

THE STRUCTURE CHARACTERIZATION OF ETHYLENE-PROPYLENE RANDOM COPOLYMERS FOR HOT WATER PIPING

作　　者：郭梅芳[1] 董宇平[1] 黄红红[2] 张京春[2] 李前树[1] 

机构地区：[1]北京理工大学理学院,北京100081 [2]中国石油化工股份有限公司北京化工研究院,北京100013

出　　处：《高分子学报》2006年第1期177-179,共3页Acta Polymerica Sinica

基　　金：国家重点基础研究发展规划项目(项目号G1999064800-07)

摘　　要：Two commercial ethylene-propylene random copolymers(A and B) for hot water piping of which A has better long term heat stability and slow crack growth resistance performance than B were fractionated with respect to the isotactity distribution by preparative temperature-rising elution fractionation(TREF).The molecular weight and distribution of fractions and the original resins were investigated by gel permeation chromatography.The results indicated that both A and B had broad isotacticity distribution and A had fewer portions of high isotacticity than B.At the same time A had broader and more typical double-peak molecular weight distribution.The fractions of A had higher molecular weight and broader molecular weight distribution than those of B’s.All of these results implied the differences between the catalysts or the polymerization processes for the two copolymers.Two commercial ethylene-propylene random copolymers （A and B） for hot water piping of which A has better long term heat stability and slow crack growth resistance performance than B were fractionated with respect to the isotactity distribution by distribution of fractions and preparative temperature-rising the original resins were inves elution fractionation （TREF）. The molecular weight and tigated by gel permeation chromatography . The results indicated that both A and B had broad isotacticity distribution and A had fewer portions of high isotacticity than B. At the same time A had broader and more typical double-peak molecular weight distribution. The fractions of A had higher molecular weight and broader molecular weight distribution than those of B＇ s. All of these results implied the differences between the catalysts or the polymerization processes for the two copolymers.

关 键 词：丙烯-乙烯无规共聚物 热水管材 TREF GPC 

分 类 号：TQ320.7[化学工程—合成树脂塑料工业]