Temperature and molecular weight dependence of fracture behaviour of polypropylene films

被引：24

作者：

Fayolle, B ^{[1
]}

Tcharkhtchi, A ^{[1
]}

Verdu, J ^{[1
]}

机构：

[1] ENSAM 151, F-75013 Paris, France

来源：

POLYMER TESTING | 2004年 / 23卷 / 08期

关键词：

polypropylene; molecular weight; temperature; ductile fracture; EWF;

D O I：

10.1016/j.polymertesting.2004.04.013

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

The effect of temperature on fracture behaviour of isotactic polypropylene films has been studied on two PP samples of molecular weights Mw = 270 kg mol(-1) and Mw = 150 kg mol(-1), using the Essential Work of Fracture method. Two ductile-brittle transitions as a function of temperature are in evidence at respectively similar to10 and 60 degreesC. The former transition occurs for the highest molecular weight and the latter one for the lowest molecular weight. Three processes are involved in the temperature effect on PP toughness: (1) The decrease of yield stress with temperature according to Eyring's law; (2) The role of cooperative motions in the amorphous phase: the ductile-brittle transition of the sample of highest M-w corresponds to the glass transition; and (3) The role of the mobility of the crystalline phase: the ductile-brittle transition of the sample of lowest Mw corresponds to the alphaC transition. (C) 2004 Elsevier Ltd. All rights reserved.

引用

页码：939 / 947

页数：9

共 24 条

[1]

Balta-Calleja F. J., 1970, J MACROMOL SCI, V4, P519, DOI [10.1080/00222347008229372, DOI 10.1080/00222347008229372]

[2]

Broberg K. B., 1968, INT J FRAC MECH, V4, P11

[3]

Casellas JJ, 1999, J APPL POLYM SCI, V74, P781, DOI 10.1002/(SICI)1097-4628(19991024)74:4<781::AID-APP4>3.0.CO

[4]

2-R