PHASE-CHANGES IN ISOTACTIC POLYPROPYLENE MEASURED BY MICROHARDNESS

被引：42

作者：

CALLEJA, FJB ^{[1
]}

SALAZAR, JM ^{[1
]}

ASANO, T ^{[1
]}

机构：

[1] UNIV HAMBURG,INST TECH & MAKROMOLEK CHEM,D-2000 HAMBURG 13,FED REP GER

来源：

JOURNAL OF MATERIALS SCIENCE LETTERS | 1988年 / 7卷 / 02期

关键词：

SURFACES - Mechanical Properties;

D O I：

10.1007/BF01730607

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The object of the present study is to examine the influence of polymorphic changes on the values of MH. For this purpose isotactic polypropylene was selected as a material which can crystallize into two polymorphic forms: the alpha (monoclinic) and beta (hexagonal). Microhardness was measured at room temperature using a Leitz tester adapted with a square-pyramidal diamond indentor. The MH value was derived from the residual projected area of indentation. The results show that the MH of the material decreases from about 111 MN m** minus **2 to a value of 90 MN m** minus **2 when passing from the alpha - to the beta -phase texture.

引用

页码：165 / 166

页数：2