Detection of Low Levels of Long-Chain Branching in Polydisperse Polyethylene Materials

被引：10

作者：

Karjala, Teresa P. ^{[1
]}

Sammler, Robert L. ^{[2
]}

Mangnus, Marc A. ^{[3
]}

Hazlitt, Lonnie G. ^{[1
]}

Johnson, Mark S. ^{[1
]}

Wang, Jian ^{[1
]}

Hagen, Charles M., Jr. ^{[1
]}

Huang, Joseph W. L.

Reichek, Kenneth N. ^{[1
]}

机构：

[1] Dow Chem Co USA, Basic Plast Res, Freeport, TX 77541 USA

[2] Dow Chem Co USA, Mat Sci & Engn Lab, Midland, MI 48674 USA

[3] Dow Chem Co USA, Basic Plast Res, Hoek, Netherlands

来源：

JOURNAL OF APPLIED POLYMER SCIENCE | 2011年 / 119卷 / 02期

关键词：

polyethylene; long-chain branching; zero-shear viscosity; molecular weight distribution; CRYSTALLIZABLE HYDROCARBON POLYMERS; GEL-PERMEATION CHROMATOGRAPHY; MOLECULAR-WEIGHT; MELT RHEOLOGY; FLOW PROPERTIES; LINEAR POLYETHYLENES; OSCILLATORY SHEAR; BEHAVIOR; ENTANGLEMENT; FRACTIONS;

D O I：

10.1002/app.32720

中图分类号：

O63 [高分子化学（高聚物）];

学科分类号：

070305 ; 080501 ; 081704 ;

摘要：

Creep experiments have been applied to probe the zero-shear viscosity, eta(0), of polyethylene chains directly and precisely in a constant-stress rheometer at 190 degrees C. Such experiments, when combined with precise measurements of the weight-average molecular weight, M-w, calibrated relative to linear chains of high-density polyethylene, are shown to provide a very sensitive approach to detect low levels (0.005 branches per 1000 carbons) of long-chain branching (LCB). This detection limit is shown to be insensitive to whether the molecular weight distribution (MWD) breadth, M-w/M-nr rises from about two to ten. (C) 2010 Wiley Periodicals, Inc. J Appl Polym Sci 119: 636-646, 2011

引用

页码：636 / 646

页数：11

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