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高分子学报 2012

α-甲基苯乙烯-马来酸酐共聚物的合成及其引发的甲基丙烯酸甲酯的无皂乳液聚合

DOI: 10.3724/SP.J.1105.2012.11073, PP. 75-82

曹莉娟,尹梅贞,马育红,杨万泰

Keywords: α-甲基苯乙烯,大分子引发剂,乳液聚合,甲基丙烯酸甲酯

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Abstract:

以α-甲基苯乙烯(AMS)、马来酸酐(MANH)为共聚单体,偶氮二异丁腈(AIBN)为引发剂,采用自稳定沉淀聚合法合成了α-甲基苯乙烯和马来酸酐的共聚物,再将其皂化后得到具有引发和乳化双重作用的共聚物.该共聚物可以作为大分子引发剂再引发甲基丙烯酸甲酯(MMA)进行无皂乳液聚合.采用扫描电镜、红外光谱仪、乌氏黏度计等仪器对AMS-MANH共聚物以及乳液聚合产物进行了表征.结果表明,乳液聚合产物是以PMMA为主长链,AMS和MANH低聚物为短链的嵌段共聚物.单体最高转化率可达到85%,特性黏数在80mL/g左右.乳胶粒子粒径在150~200nm之间.聚合速率随着引发剂浓度的增加而增大,聚合物的特性黏数随着转化率的提高基本呈线性增大.

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