FLUORESCENCE STUDIES OF POLYMER COLLOIDS .25. FLUORESCENCE STUDIES OF COALESCENCE AND FILM FORMATION IN POLY(METHYL METHACRYLATE) NONAQUEOUS DISPERSION PARTICLES

被引:155
作者
PEKCAN, O
WINNIK, MA
CROUCHER, MD
机构
[1] UNIV TORONTO,DEPT CHEM,TORONTO M5S 1A1,ONTARIO,CANADA
[2] UNIV TORONTO,ERINDALE COLL,TORONTO M5S 1A1,ONTARIO,CANADA
[3] XEROX RES CTR CANADA LTD,MISSISSAUGA L5K 2L1,ONTARIO,CANADA
关键词
D O I
10.1021/ma00212a013
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(methyl methacrylate) [PMMA] particles (d = 1 tim) were prepared by nonaqueous dispersion polymerization. One batch of particles was labeled with phenanthrene [Phe] groups, and a second batch, with anthracene [An], When mixed, spread as thin films, and then heated above the glass transition temperature of the PMMA, coalescence occurred. Particle fusion was accompanied by increasing amounts of nonradiative energy from Phe* to An. Energy transfer was followed quantitatively by carrying out fluorescence decay measurements on samples quenched to room temperature. The data fit nicely to a Fickian diffusion model and yield values of the diffusion coefficients, D, on the order of 10-15 cm2 s-1. These D values characterize the diffusion of (labeled) polymer molecules across the particle-particle boundary. Since the PMMA in the particles has a broad molecular weight distribution, the D values represent an ensemble average over that distribution. © 1990, American Chemical Society. All rights reserved.
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页码:2673 / 2678
页数:6
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