Ethylene polymerization over supported titanium-magnesium catalysts: Heterogeneity of active centers and effect of catalyst composition on the molecular mass distribution of polymer

被引：8

作者：

Zakharov, Vladimir ^{[1
]}

Matsko, Mikhail ^{[1
]}

Echevskaya, Ludmila ^{[1
]}

Mikenas, Tatiana ^{[1
]}

机构：

[1] Boreskov Inst Catalysis SB, RAS, R-630090 Novosibirsk, Russia

来源：

MACROMOLECULAR SYMPOSIA | 2007年 / 260卷

关键词：

fractionation of polymers; molecular weight distribution/molar mass distribution; polyethylene (PE); titanium-magnesium catalysts (TMC); ziegler-natta polymerization;

D O I：

10.1002/masy.200751427

中图分类号：

O63 [高分子化学（高聚物）];

学科分类号：

070305 ; 080501 ; 081704 ;

摘要：

New experimental approach was used for analysis of molecular weight distribution (MWD) of polymers produced over titanium-magnesium catalysts (TMC). Polymers were fractionated on to fractions with narrow MWD (polydispersity (PD) values Mw/Mn <= 2). Then some of these fractions were combined to get the minimal quantity of fractions with PD values close to 2 (Flory components). it was found that three fractions corresponding to three groups of active centers are sufficient for proper fitting experimental MWD curve for PE obtained over TMC with different Ti content and with different hydrogen concentration in polymerization.

引用

页码：184 / 188

页数：5

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