Preparation of poly(styrene-co-isobornyl methacrylate) beads having controlled glass transition temperature by suspension polymerization
Preparation of poly(styrene-co-isobornyl methacrylate) beads having controlled glass transition temperature by suspension polymerization
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DOI：
10.1002/app.38710
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发表时间：
2013-07
影响因子：
3
通讯作者：
Bing Zhang;Yuhong Ma;Dong Chen;Jingnan Xu;Wantai Yang
中科院分区：
文献类型：
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作者：
Bing Zhang;Yuhong Ma;Dong Chen;Jingnan Xu;Wantai Yang
采用悬浮聚合法成功地制备了玻璃化转变温度（Tg）在105-158°C范围内的苯乙烯（St）和甲基丙烯酸异冰片酯（IBMA）无规共聚物微球。系统地研究了单体配比对聚合产率、共聚物的分子量和分子量分布、共聚物组成及玻璃化转变温度的影响。在90°C下，以过氧化苄为引发剂，单体竞聚率分别为r1（St）= 0.57和r2（IBMA）= 0.20。当单体进料中IBMA的质量分数为约40wt%时，观察到单体转化率可高达90wt%。共聚物中IBMA单元的分数在35-40重量%的范围内，并且相应共聚物的Tg在119.6-128°C的范围内，而单体转化率从0增加到大于90重量%。此外，还讨论了分散剂、聚合时间、引发剂浓度等因素对共聚反应的影响。© 2012 Wiley Periodicals，Inc. J. Appl. Polym.科学，2013
The styrene (St) and isobornyl methacrylate (IBMA) random copolymer beads with controlled glass transition temperature (Tg), in the range of 105–158°C, were successfully prepared by suspension polymerization. The influence of the ratios of IBMA in monomer feeds on the copolymerization yields, the molecular weights and molecular weight distributions of the produced copolymers, the copolymer compositions and the Tgs of these copolymers was investigated systematically. The monomer reactivity ratios were r1 (St) = 0.57 and r2 (IBMA) = 0.20 with benzyl peroxide as initiator at 90°C, respectively. As the mass fraction of IBMA in monomer feeds was about 40 wt %, it was observed that the monomer conversion could be up to 90 wt %. The fractions of IBMA unit in copolymers were in the range of 35–40 wt % and Tgs of the corresponding copolymers were in the range of 119.6–128°C while the monomer conversion increased from 0 to greater than 90 wt %. In addition, the effects of other factors, such as the dispersants, polymerization time and the initiator concentration on the copolymerization were also discussed. © 2012 Wiley Periodicals, Inc. J. Appl. Polym. Sci., 2013