GELATION OF A RADIATION CROSS-LINKED MODEL POLYETHYLENE

被引：57

作者：

VALLES, EM ^{[1
]}

CARELLA, JM ^{[1
]}

WINTER, HH ^{[1
]}

BAUMGAERTEL, M ^{[1
]}

机构：

[1] UNIV MASSACHUSETTS,DEPT CHEM ENGN,AMHERST,MA 01003

来源：

RHEOLOGICA ACTA | 1990年 / 29卷 / 06期

关键词：

GELATION; RADIATION CROSS-LINKED POLYETHYLENE; GEL EQUATION;

D O I：

10.1007/BF01329300

中图分类号：

O3 [力学];

学科分类号：

08 ; 0801 ;

摘要：

A radiation crosslinked model linear low-density polyethylene (LLDPE) exhibits power-law relaxation, G(t) = St(-n) at its gel point (GP). The relaxation exponent has a value of about 0.46. The relaxation behavior is dominated by power laws, not only directly at GP, but in a very broad vicinity of GP and in a frequency window, which narrows with distance from the gel point. The power law exponent decreases with increasing radiation dose (increasing extent of crosslinking). Independent measurements of the gel fraction and the molecular-weight distribution of the radiated samples' soluble fraction support the rheological observations.

引用

页码：535 / 542

页数：8

共 21 条

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