Effects of recycling on the microstructure and the mechanical properties of isotactic polypropylene

被引：176

作者：

Aurrekoetxea, J ^{[1
]}

Sarrionandia, MA

Urrutibeascoa, I

Maspoch, ML

机构：

[1] Mondragon Unibertsitatea, Fac Engn, Dept Mech, Mondragon 20500, Spain

[2] Univ Politecn Catalunya, Ctr Catala Plast, Dept Ciencia Mat & Engn Met, E-08028 Barcelona, Spain

来源：

JOURNAL OF MATERIALS SCIENCE | 2001年 / 36卷 / 11期

关键词：

D O I：

10.1023/A:1017983907260

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Polypropylene (PP) was injection moulded several times to mimic the effect of recycling procedures. The influence of the recycling was studied by following changes in chemical structure, melt viscosity, crystallisation behaviour, and tensile and fracture properties. The main effect of recycling is the lowering of the melt viscosity, which is attributed to molecular weight decrease. Recycled PP exhibits greater crystallisation rate, higher crystallinity and equilibrium melting temperature than those measured for virgin PP. Elastic modulus and yield stress increase with the number of recycling steps. However, elongation at break and fracture toughness decrease. (C) 2001 Kluwer Academic Publishers.

引用

页码：2607 / 2613

页数：7

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