Measurement of hole volume in amorphous polymers using positron spectroscopy

被引：105

作者：

Hristov, HA ^{[1
]}

Bolan, B ^{[1
]}

Yee, AF ^{[1
]}

Xie, L ^{[1
]}

Gidley, DW ^{[1
]}

机构：

[1] UNIV MICHIGAN,DEPT PHYS,ANN ARBOR,MI 48109

来源：

MACROMOLECULES | 1996年 / 29卷 / 26期

关键词：

D O I：

10.1021/ma960719k

中图分类号：

O63 [高分子化学（高聚物）];

学科分类号：

070305 ; 080501 ; 081704 ;

摘要：

Positron annihilation lifetime spectroscopy (PALS) measurements, in the temperature range 110-480 K, are given for three linear, amorphous polymers. Based on these measurements, a method is proposed for evaluating the hole volume in amorphous thermoplastics. Our studies show that hole volume is composed of static and dynamic components. We demonstrate that the dynamic component, which is a result of the thermal vibrations of the molecular chains, is strongly correlated to thermodynamic volume/density fluctuations, The static hole volume is interpreted as ''frozen-in'' fluctuations, which are manifested as nanometer-sized flaws in the packing of molecular chains. The results from PALS measurements reported in our work are in very good agreement with results from small-angle X-ray scattering measurements.

引用

页码：8507 / 8516

页数：10

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