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首页> 外文期刊>Journal of Macromolecular Science. Pure and Applied Chemistry >Semi-continuous Heterophase Polymerization of n-Butyl Methacrylate: Effect of Monomer Feeding Rate
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Semi-continuous Heterophase Polymerization of n-Butyl Methacrylate: Effect of Monomer Feeding Rate

机译：甲基丙烯酸正丁酯的半连续异相聚合：单体进料速率的影响

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摘要

The effect of monomer feeding rate on particle size, molar masses, glass transition and tacticity of poly(n-butyl methacrylate) (PBMA) nanoparticles synthesized by semi-continuous heterophase polymerization under monomer-starved conditions is reported. Three feed rates were examined. Highly monomer-starved conditions at the two slower addition rates were confirmed by the low amount of residual monomer throughout the reaction and by the fact that the instantaneous polymerization and feeding rates became similar at later stages of the reaction. Under these conditions, polymer particles in the nanometer range (30 to 35 nm) were obtained. Glass transition temperatures are substantially higher than those reported for commercial PBMA. Polymers tacticity was determined by ~(13)C-NMR spectroscopy. NMR measurements confirm that the syndiotactic content of the PBMA synthesized here is larger than those of the commercial ones made by free-radical polymerization. Molar masses are much lower than those expected from termination by chain transfer to monomer, which is the typical termination mechanism in microemulsion polymerization.
机译：报道了单体进料速率对在单体缺乏条件下通过半连续异相聚合合成的聚甲基丙烯酸正丁酯（PBMA）纳米粒子的粒径，摩尔质量，玻璃化转变和立构规整度的影响。检查了三种进料速率。在两个较慢的添加速率下，高度缺乏单体的条件是由于整个反应过程中残留的单体数量少，以及瞬时聚合和进料速率在反应后期变得相似的事实所证实。在这些条件下，获得了纳米范围（30至35nm）的聚合物颗粒。玻璃化转变温度明显高于商业PBMA报道的温度。聚合物的立构规整度通过〜（13）C-NMR光谱确定。 NMR测量证实，此处合成的PBMA的间同含量比通过自由基聚合制备的市售PBMA的间同含量大。摩尔质量远低于通过链转移至单体而终止的分子量，这是微乳液聚合的典型终止机理。

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