129Xe-NMR study of free volume in amorphous perfluorinated polymers:: comparsion with other methods

被引：57
作者：
Golemme, G
Nagy, JB
Fonseca, A
Algieri, C
Yampolskii, Y
机构：
[1] Russian Acad Sci, AV Topchiev Petrochem Synth Inst, Moscow 119991, Russia
[2] Fac Univ Notre Dame Paix, Dept Chim, Lab RMN, Namur, Belgium
[3] CNR, IRMERC, Ist Ric Membrane & Modellist Reattori Chim, I-87030 Arcavacata Di Rende, Italy
[4] Univ Calabria, Dipartimento Ingn Chim & Mat, I-87030 Arcavacata Di Rende, Italy
来源：
POLYMER | 2003年 / 44卷 / 17期
基金：
俄罗斯基础研究基金会;
关键词：
free volume; glassy polymers; Xe-129 nuclear magnetic resonance;
D O I：
10.1016/S0032-3861(03)00450-6
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 Xe-129-NMR method was used for evaluation of the sizes of free volume elements in amorphous glassy materials-random copolymers of tetrafluoroethylene and perfluorodioxoles of different structures. Xe-129 chemical shifts were measured at different pressures up to 1060 Torr. The zero pressure chemical shifts obtained by extrapolation were used for calculation of the diameters of microcavities having spherical and cylindrical shapes. The sizes of microcavities are consistent with those found by means of positron annihilation lifetimes and inverse gas chromatography methods. (C) 2003 Elsevier Science Ltd. All rights reserved.
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收藏
页码：5039 / 5045
页数：7
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