HETEROGENEOUS PHOTOPOLYMERIZATION OF METHYL-METHACRYLATE INITIATED BY SMALL ZNO PARTICLES

被引：66

作者：

HUANG, ZY ^{[1
]}

BARBER, T ^{[1
]}

MILLS, G ^{[1
]}

MORRIS, MB ^{[1
]}

机构：

[1] AUBURN UNIV,DEPT CHEM,AUBURN,AL 36849

来源：

JOURNAL OF PHYSICAL CHEMISTRY | 1994年 / 98卷 / 48期

关键词：

D O I：

10.1021/j100099a044

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The photopolymerization of methyl methacrylate initiated by annealed quantum-sized ZnO particles was studied in unstirred 2-propanol solutions. Polymer formation proceeds via a free radical pathway with an activation energy of E(a) = 19.7 kT mol(-1). Autoaccelerated polymerization was not observed, and the experimental evidence suggests that the mechanism of the process is different from the simple mechanism of polymerization in stirred solutions of nonannealed ZnO particles. The kinetic results as well as the solvent effects are explained under the assumption that initiation, propagation, and termination reactions take place preferentially on the surface of the oxide particles. Predominantly syndiotactic poly(methyl methacrylate) is the product of the photopolymerization reaction, and unoriented samples of the polymer exhibit an unusual crystallinity.

引用

页码：12746 / 12752

页数：7

共 35 条

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