ANISOTROPY OF FREE-VOLUME-HOLE DIMENSIONS IN POLYMERS PROBED BY POSITRON-ANNIHILATION SPECTROSCOPY

被引：42
|
作者：
JEAN, YC [1 ]
NAKANISHI, H [1 ]
HAO, LY [1 ]
SANDRECZKI, TC [1 ]
机构：
[1] MCDONNELL DOUGLAS CORP,MCDONNELL DOUGLAS RES LABS,ST LOUIS,MO 63166
来源：
PHYSICAL REVIEW B | 1990年 / 42卷 / 15期
关键词：
D O I：
10.1103/PhysRevB.42.9705
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The structures of atomic-scale free-volume holes in stretched [poly(aryl-ether-ether-ketone)] PEEK and [poly(methyl methacrylate)] PMMA polymers were determined as a function of orientation by measuring the angular correlation of annihilation radiation from parapositronium trapped in the holes. The measured average hole diameters were found to range from 0.80"0.03 to 0.31"0.02 nm and from 0.70"0.03 to 0.42"0.02 nm, depending on orientation, in stretched PEEK and PMMA, respectively. Thus, the free-volume holes were ellipsoids with anisotropies of 2.6"0.2 and 1.7"0.2 for PEEK and PMMA, respectively. © 1990 The American Physical Society.
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收藏
页码：9705 / 9708
页数：4
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