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首页> 外文期刊>Journal of Applied Polymer Science >GPC Observations of Branching Effects in Anionic Polymerization of Methyl Methacrylate: A Preliminary Study
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GPC Observations of Branching Effects in Anionic Polymerization of Methyl Methacrylate: A Preliminary Study

机译：GPC观察甲基丙烯酸甲酯的阴离子聚合中的支化作用：初步研究

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The anionic polymerization of methyl methacrylate was performed ill tetrahydrofuran (THF) at -78 degrees C, using sec-butyllithium/1,1-diphenylethylene (DPE) as the initiation system. The effects of polymerization time and initiator concentration on the branching reaction were studied. High vacuum was used to prevent contamination during the polymerization. Gel permeation chromatography (GPC) was used to characterize the branching effect qualitatively. Experimental results indicated that the monomer conversion reached more than 98%, in a polymerization time of 10 min. The branching reaction occurred after high monomer conversion, resulting in a tail of high molecular weight in the GPC trace. This branching effect, observed by GPC, increased with polymerization time. Rapid termination was thus probably required immediately after all of the monomer was consumed in the preparation of a well-defined PMMA without a high-molecular-weight tail in this diphenylbutylllithium/THF/-78 degrees C system. (C) 2008 Wiley Periodicals, Inc. J Appl Poly Sci 111: 2099-2103, 2009
机译：使用仲丁基锂/ 1,1-二苯基乙烯（DPE）作为引发体系，在-78℃，四氢呋喃（THF）中进行甲基丙烯酸甲酯的阴离子聚合。研究了聚合时间和引发剂浓度对支化反应的影响。高真空被用来防止聚合过程中的污染。凝胶渗透色谱法（GPC）用于定性表征支化作用。实验结果表明，在10分钟的聚合时间内，单体转化率达到98％以上。在高单体转化率之后发生支化反应，从而在GPC迹线中产生高分子量的尾巴。通过GPC观察到的这种支化作用随聚合时间的增加而增加。因此，在该二苯基丁基锂/ THF / -78℃系统中，在制备出没有高分子量尾巴的明确定义的PMMA后，所有单体全部消耗完之后，可能需要立即快速终止。 （C）2008 Wiley Periodicals，Inc.J Appl Poly Sci 111：2099-2103，2009

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