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

被引:71
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
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
收藏
页码:142 / 147
页数:6
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