Long-Chain Branches in Syndiotactic Polypropene Induced by Vinyl Chloride

被引：13

作者：

Stadler, Florian J. ^{[2
,3
]}

Arikan, Burcak ^{[1
]}

Kaschta, Joachim ^{[3
]}

Kaminsky, Walter ^{[1
]}

机构：

[1] Univ Hamburg, Inst Tech & Macromol Chem, D-20146 Hamburg, Germany

[2] Chonbuk Natl Univ, Sch Semicond & Chem Engn, Jeonju 561756, Jeonbuk, South Korea

[3] Univ Erlangen Nurnberg, Inst Polymer Mat, Dept Mat Sci & Engn, D-91058 Erlangen, Germany

来源：

MACROMOLECULAR CHEMISTRY AND PHYSICS | 2010年 / 211卷 / 13期

关键词：

GPC-MALLS; long-chain branches; metallocene catalysts; rheology; syndiotactic polypropene; ETHENE/ALPHA-OLEFIN COPOLYMERS; HIGH-DENSITY POLYETHYLENES; MOLAR-MASS DISTRIBUTION; GURP-PALMEN-PLOT; MOLECULAR-STRUCTURE; RHEOLOGICAL PROPERTIES; THERMORHEOLOGICAL BEHAVIOR; METALLOCENE CATALYSTS; VISCOSITY FUNCTIONS; SHEAR COMPLIANCE;

D O I：

10.1002/macp.200900688

中图分类号：

O63 [高分子化学（高聚物）];

学科分类号：

070305 ; 080501 ; 081704 ;

摘要：

Syndiotactic polypropene was synthesized using a metallocene catalyst system and traces of VC. The use of VC was found to decrease the molar mass (M) over bar (w) of the samples distinctly and linearly, while retaining the molar mass distribution, the crystallinity, and the syndiotacticity. The VC, however, initiates the formation of long-chain branches, which were detected by GPC-MALLS and rheology. Besides their effect on the viscosity and modulus functions, a thermorheologic complexity can be observed. Also the flow activation energy E(a) was found to be increased. The modified samples did not obey the eta(0)/(M) over bar (w) relation for linear sPP, indicating the presence of LCBs.

引用

页码：1472 / 1481

页数：10

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