Transport of a poly(ethylene oxide) solution through porous coated silica studied by spin labelling

被引：2

作者：

Afif, A ^{[1
]}

Chikhi, M ^{[1
]}

Hommel, H ^{[1
]}

Legrand, AP ^{[1
]}

机构：

[1] Ecole Super Phys & Chim Ind, Phys Quant Lab, CNRS, URA 1428,ESA 7069, F-75231 Paris 05, France

来源：

POLYMER | 2001年 / 42卷 / 06期

关键词：

solid-fluid interface processes; amorphous and polymeric materials; magnetic resonance and relaxation;

D O I：

10.1016/S0032-3861(00)00547-4

中图分类号：

O63 [高分子化学（高聚物）];

学科分类号：

070305 ; 080501 ; 081704 ;

摘要：

Poly(ethylene oxide) (PEO) chains of molecular weight 4000 have been labelled at their free end by a nitroxide free radical and adsorbed on silica in cyclohexane. A solution of PEO 10 000 was allowed to how through the impregnated silica in an Electron Paramagnetic Resonance spectrometer and the decay of the signal recorded as a function of time. The exchange of the short chains by the longer ones and the transport through the quenched disorder proceeds linearly with time. This observation could be characteristic of a diffusion mechanism similar to the Darcy law as the limiting factor of the whole process in the time regime used. (C) 2000 Elsevier Science Ltd. All rights reserved.

引用

页码：2711 / 2715

页数：5

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