Polymer diffusion in latex films at ambient temperature

被引:0
|
作者
Feng, JR
Pham, H
Stoeva, V
Winnik, MA [1 ]
机构
[1] Univ Toronto, Dept Chem, Toronto, ON M5S 3H6, Canada
[2] Univ Toronto, Erindale Coll, Toronto, ON M5S 3H6, Canada
关键词
polymer diffusion; ambient temperature; fluorescence; latex films; poly(butyl methacrylate); poly((acetoacetoxy)ethyl methacrylate-co-ethylhexyl methacrylate);
D O I
10.1002/(SICI)1099-0488(199805)36:7<1129::AID-POLB4>3.0.CO;2-P
中图分类号
O63 [高分子化学(高聚物)];
学科分类号
070305 ; 080501 ; 081704 ;
摘要
Polymer diffusion across interfaces at room temperature (21 degrees C) was analyzed by direct nonradiative energy transfer (DET) in labeled latex films. Two model latex polymers were examined: poly(butyl methacrylate) [PBMA, M-w, = 3.5 x 10(4), T-g (dry) = 21 degrees C] and a copolymer of 2-ethylhexyl methacrylate with 10 wt % (acetoacetoxy)ethyl methacrylate [P(EHMA-co-AAEM), M-w = 4.8 x 10(4), T-g (dry) = -7 degrees C]. Little energy transfer due to polymer diffusion was detected for the P(EHMA-co-AAEM) latex samples in the dispersed state or dried to solids content below ca. 90%, but above 90% solids, diffusion occurs among particles. For PBMA, diffusion occurs only after the film is dried (>97% solids) and aged. In the dry PBMA films, it requires 4-5 days at 21 degrees C to reach a significant extent of mixing (f(m) = 0.3-0.4). This corresponds to an estimated penetration depth d(app) of 30-40 nm and a mean apparent diffusion coefficient (D-app) of 5 x 10(-4) nm(2)/s. The corresponding D-app value for the dry P(EHMA-co-AAEM) sample is 5 x 10(-2) nm(2)/s, and it takes about 25-40 min for this polymer to reach f(m) of of 20-30 nm. (C) 1998 John Wiley & Sons, Inc.
引用
收藏
页码:1129 / 1139
页数:11
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