杂环酰基引发甲基丙烯酸甲酯的光聚合

Polymer Photochemistry Pub Date : 1986-01-01 DOI:10.1016/0144-2880(86)90025-4

S. Saini, A.K. Srivastava

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引用次数: 6

摘要

在可见光(440 nm)存在下，以β-吡啶对氯苯酰基酯为光引发剂，在30℃下进行了甲基丙烯酸甲酯(MMA)的溶液聚合。引发剂指数为0.5，单体指数为1·0±0.01。kp2kt的平均值为4·07 × 10−2。对苯二酚的存在阻碍了聚合;然而，非极性溶剂(环己烷)提高了聚合的速度。动力学数据和ESR研究表明，整体聚合是通过自由基机制发生的，通过三重态碳的形成作为自由基的来源。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Heterocyclic ylide initiated photopolymerization of methyl methacrylate

Solution polymerization of methyl methacrylate (MMA) was carried out in the presence of visible light (440 nm) using β-picolinium p-chlorophenacylide as a photoinitiator at 30°C. The initiator and monomer exponent values were calculated to be 0·5 and 1·0 ± 0·01, respectively. An average value of $k_{p}^{2} k_{t}$ was 4·07 × 10⁻². The polymerization was retarded in the presence of hydroquinone; however, a nonpolar solvent (cyclohexane) enhanced the rate of polymerization. Kinetic data and ESR studies indicate that the overall polymerization takes place by a radical mechanism via triplet carbene formation which acts as a source of free radicals.

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