A critical molar mass separating the ductile and brittle regimes as revealed by thermal oxidation in polypropylene

被引：65

作者：

Fayolle, B ^{[1
]}

Audouin, L ^{[1
]}

Verdu, J ^{[1
]}

机构：

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

来源：

POLYMER | 2004年 / 45卷 / 12期

关键词：

polypropylene; fracture; critical molar mass;

D O I：

10.1016/j.polymer.2004.03.069

中图分类号：

O63 [高分子化学（高聚物）];

学科分类号：

070305 ; 080501 ; 081704 ;

摘要：

The thermal oxidation of unstabilized polypropylene films has been studied at 70, 90, 110 and 130degreesC in air by IR, SEC, rheometry and tensile testing. Embrittlement is observed when the weight average molar mass reaches 210 +/- 10 kg mol(-1). Polydispersity data are consistent with a homogeneous random chain scission process. This especially high sensitivity of fracture properties to chain scission is assumed to be specific of semi-crystalline polymers having their amorphous phase in rubbery state. (C) 2004 Elsevier Ltd. All rights reserved.

引用

页码：4323 / 4330

页数：8

共 49 条

[1] ROLE OF OXYGEN DIFFUSION IN POLYMER AGING - KINETIC AND MECHANICAL ASPECTS [J].