The polymerization mechanism of acrylate initiated by methyl phenylglyoxylate was investigated. Matrix-assisted laser desorption/ionization time-of-flight mass spectra of the resultant polymer indicated that most polymers had either an acryloyl group or a benzoyl group as the initiating site. These results suggest that methyl phenylglyoxylate initiates polymerization by hydrogen abstraction from both a monomer and another initiator. These hydrogen abstraction-based polymerization reactions occur simultaneously but follow separate pathways. Polymers with acryloyl groups at both chain ends acted as cross-linkers in the subsequent polymerization involving gelation. Photopolymerization of dodecyl acrylate was conducted using methyl phenylglyoxylate as an initiator. Most polymers had either an acryloyl group or a benzoyl group at one of the chain ends. We investigated the initiation pathways and found out that methyl phenylglyoxylate initiated photopolymerization only by Norrish type II processes.

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使用苯乙醛酸甲酯作为引发剂的丙烯酸酯光聚合中的引发和终止途径

研究了苯乙醛酸甲酯引发丙烯酸酯的聚合机理。所得聚合物的基质辅助激光解吸/电离飞行时间质谱表明大多数聚合物具有丙烯酰基或苯甲酰基作为起始位点。这些结果表明苯基乙醛酸甲酯通过从单体和另一种引发剂中夺氢来引发聚合。这些基于夺氢的聚合反应同时发生，但遵循不同的途径。在两个链端带有丙烯酰基的聚合物在随后涉及凝胶化的聚合中充当交联剂。使用苯乙醛酸甲酯作为引发剂进行丙烯酸十二烷基酯的光聚合。大多数聚合物在链端之一具有丙烯酰基或苯甲酰基。