Topology of high free volume regions from pulsed field gradient diffusion studies of penetrant motion in perfluorodioxole copolymer

被引：14

作者：

Meresi, G ^{[1
]}

Wang, YZ ^{[1
]}

Cardoza, J ^{[1
]}

Wen, WY ^{[1
]}

Jones, AA ^{[1
]}

Inglefield, PT ^{[1
]}

机构：

[1] Clark Univ, Carlson Sch Chem, Worcester, MA 01610 USA

来源：

MACROMOLECULES | 2001年 / 34卷 / 05期

关键词：

D O I：

10.1021/ma0009395

中图分类号：

O63 [高分子化学（高聚物）];

学科分类号：

070305 ; 080501 ; 081704 ;

摘要：

Perfluorodioxole (TFE/PDD) is a random copolymers of tetrafluoroethylene and 2,2-bis(trifluoromethyl)-4,5-difluoro-1,3-dioxole with very high permeability especially for a high glass transition polymer. TFE/PDD has a high fractional free volume, around 0.3. The value of 0.3 is about an order of magnitude larger than that associated with typical glassy polymers. The highest free volume is considered to be located in disordered regions of this polymer containing free volume elements of 0.59-0.64 nm as determined by positron annihilation lifetime spectroscopy. For the larger decafluoropentane as the penetrants, the high free volume regions are not interconnected. An estimate of the size of regions containing high free volume regions was obtained.

引用

页码：1131 / 1133

页数：3

共 11 条

[1] High transport parameters and free volume of perfluorodioxole copolymers [J].