Microindentation studies at the near surface of glassy polymers: Influence of molecular weight

被引：17

作者：

Calleja, FJB

Flores, A

Michler, GH

机构：

[1] CSIC, Inst Estructura Mat, E-28006 Madrid, Spain

[2] Univ Halle Wittenberg, Dept Engn, Inst Sci Mat, D-06099 Halle Saale, Germany

来源：

JOURNAL OF APPLIED POLYMER SCIENCE | 2004年 / 93卷 / 04期

关键词：

amorphous polymers; microindentation hardness; glass transition temperature; molecular weight; entanglements;

D O I：

10.1002/app.20665

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 viscoelastic-plastic properties of various amorphous, glassy polymers [polystyrene (PS), poly(styrene-acrylonitrile) copolymer (SAN), poly(methyl methacrylate) (PMMA), poly(vinyl chloride) (PVC), polycarbonate (PC)] in the micron and submicron range were investigated by means of load-displacement analysis from depth-sensing experiments. Hardness and Young's modulus values decrease rapidly with increasing depth up to a few microns. New data on the glass transition temperature correlation with microhardness are presented. The influence of annealing below the glass transition temperature upon the micro-hardness for various glassy polymers is pointed out. For PS, the influence of the molecular weight variation and molecular weight distribution on the microhardness is reported. Results are discussed on the basis of an entanglement network model, recently developed to explain the fine structure of crazes in amorphous polymers. (C) 2004 Wiley Periodicals, Inc.

引用

页码：1951 / 1956

页数：6

共 29 条

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