Positron annihilation lifetime spectroscopy for measuring free volume during physical aging of polycarbonate

被引：72

作者：

Cangialosi, D

Schut, H

van Veen, A

Picken, SJ

机构：

[1] Delft Univ Technol, Dept Polymer Sci & Engn, NL-2628 BL Delft, Netherlands

[2] Delft Univ Technol, Inst Interfac Reactor, NL-2629 JB Delft, Netherlands

来源：

MACROMOLECULES | 2003年 / 36卷 / 01期

关键词：

D O I：

10.1021/ma021214z

中图分类号：

O63 [高分子化学（高聚物）];

学科分类号：

070305 ; 080501 ; 081704 ;

摘要：

Free volume relaxation of polycarbonate (PC) as a function of aging time was investigated by means of positron annihilation lifetime spectroscopy at three different temperatures below the PC glass transition temperature. A clear decrease of the intensity of orthopositronium (o-Ps) was observed, while the o-Ps lifetime remained substantially unchanged. This was attributed to a decrease in the number of cavities in the system. The process was successfully modeled according to the Struik model, which describes a relaxation time dependent on both the temperature and the distance from equilibrium.

引用

页码：142 / 147

页数：6

共 57 条

[31] Volume and enthalpy relaxation rate in glassy materials [J].