Surface molecular diffusion in latex films observed by atomic force microscopy

被引：9
作者：
Song, M
Hourston, DJ [1 ]
Zhang, H
Hammiche, A
Pollock, HM
机构：
[1] Univ Loughborough, IPTME, Loughborough LE11 3TU, Leics, England
[2] Univ Lancaster, Sch Phys & Chem, Lancaster LA1 4YB, England
来源：
POLYMER | 2001年 / 42卷 / 14期
关键词：
latex; surface diffusion; atomic force microscopy;
D O I：
10.1016/S0032-3861(01)00021-0
中图分类号：
O63 [高分子化学（高聚物）];
学科分类号：
070305 ; 080501 ; 081704 ;
摘要：
Surface molecular diffusion in a latex film has been investigated by atomic force microscopy. Deformation of the particles in the plane of the film of a real latex system did not change the centre-to-centre spacing, but the peak-to-valley distance y decreased upon annealing. The theoretical and also the experimental relationship between y and time t is given by the equation y(t) = y(0) exp(-t/tau) where tau is a constant, which is related to surface tension, particle size and the surface molecular diffusion coefficient. By measuring the change of y with time, the surface molecular diffusion coefficient may be obtained. The surface molecular diffusion coefficient for a poly(methyl methacrylate-co-butyl acrylate) (50:50) copolymer latex film at 65 degreesC was found to be 0.9 x 10(13) cm(2)/s. Surface molecular diffusion in the latex film is driven by the surface tension or surface free energy. (C) 2001 Elsevier Science Ltd. All rights reserved.
引用
收藏
页码：6299 / 6303
页数：5
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