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首页> 外文期刊>Journal of Macromolecular Science. Pure and Applied Chemistry >A Study on End Group Characterization of Poly(phenacyl methacrylate) Polymer Produced by Free Radical Polymerization
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A Study on End Group Characterization of Poly(phenacyl methacrylate) Polymer Produced by Free Radical Polymerization

机译：自由基聚合制备的聚甲基丙烯酸苯甲酯聚合物的端基表征研究

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摘要

Free-radical homopolymerization and copolymerization of phenacyl methacrylate (PAMA) with methyl methacrylate (MMA) was done using 2,2'-azobis(isobutyronitrile) (AIBN) as the initiator in 1,4-dioxane at 60°C. 1H-NMR and FT-IR spectroscopy confirmed the existence of OCH2 and CH signals and unsaturated structure and CN stretch at the chain end of low molecular weight poly(phenacyl methacrylate)[poly(PAMA)], respectively. The six-membered ring with both ester and ether at the end group was detected by 1H-NMR. In the poly(PAMA), the end groups formed due to chain transfer reactions were found in large concentrations. The mechanism of the formation of end groups has been presented. The behavior of free radical polymerization of PAMA was compared with that of phenoxycarbonylmethyl methacrylate (PCMMA). The molecular weight distribution of the homo and copolymers was determined using gel permeation chromatography. Thermal properties of the polymers were determined using differential thermal analysis (DTA) and thermogravimetric analysis (TGA).
机译：甲基丙烯酸苯甲酰酯（PAMA）与甲基丙烯酸甲酯（MMA）进行自由基均聚和共聚反应，是在60°C下于1,4-二恶烷中使用2,2'-偶氮二（异丁腈）（AIBN）作为引发剂。 1H-NMR和FT-IR光谱法分别证实了OCH2和CH信号的存在以及不饱和结构和CN在低分子量聚（甲基丙烯酸苯基酯）[poly（PAMA）]链端的伸展。通过1 H-NMR检测在端基上具有酯和醚的六元环。在聚（PAMA）中，发现由于链转移反应而形成的端基浓度很高。已经提出了端基形成的机理。比较了PAMA的自由基聚合行为与甲基丙烯酸苯氧羰基甲基酯（PCMMA）的行为。使用凝胶渗透色谱法测定均聚物和共聚物的分子量分布。使用差热分析（​​DTA）和热重分析（TGA）确定聚合物的热性能。

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