Solvent Effects in Semibatch Free Radical Copolymerization of 2-Hydroxyethyl methacrylate and Styrene at High Temperatures

被引：9
|
作者：
Liang, Kun [1 ]
Hutchinson, Robin A. [1 ]
机构：
[1] Queens Univ, Dept Chem Engn, Kingston, ON K7L 3N6, Canada
来源：
MACROMOLECULAR SYMPOSIA | 2013年 / 325卷 / 01期
关键词：
copolymerization; hydrogen bonding; 2-hydroxyethyl methacrylate; solvent effect; styrene; BUTYL METHACRYLATE; POLYMERIZATION;
D O I：
10.1002/masy.201200039
中图分类号：
O63 [高分子化学（高聚物）];
学科分类号：
070305 ; 080501 ; 081704 ;
摘要：
High temperature semibatch free radical copolymerizations of 2-hydroxyethyl methacrylate (HEMA) and styrene (ST) were carried out in xylene and DMF solution. Experimental free monomer and polymer molecular weight (MW) profiles at different temperatures and solvent concentrations are compared to those for ST polymerized with butyl methacrylate (BMA). Solvent choice, through its influence on hydrogen bonding of HEMA monomer, has a significant impact on the polymerization that is not seen for the corresponding ST/BMA reactions. The weight-average polymer MWs of ST/HEMA are unusually high (>40 kg/mol), a result of branching reactions involving dimethacrylate impurity contained in HEMA monomer. The importance of these branching reactions is also influenced by solvent choice.
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页码：203 / 212
页数：10
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