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悬浮聚合制备大尺寸梭形聚苯乙烯粒子新方法及机理研究

DOI: 10.3724/SP.J.1105.2013.13006, PP. 765-773

Keywords: 苯乙烯-马来酸酐交替共聚物,高分子表面活性剂,悬浮聚合,梭形聚合物粒子

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Abstract:

利用氢氧化钾对苯乙烯-马来酸酐交替共聚物(SMA)进行水解,所得中等皂化程度的SMA水解产物(SMAA)在水溶液中具有刚性棒状直链构型;将此特殊结构的大分子作为分散剂用于苯乙烯悬浮聚合,通过控制搅拌速度和油水比,可得到梭形聚苯乙烯粒子;在优化条件下,粒子平均长度6.8mm,宽度1.4mm,厚度0.5mm,长径比约5.0.其可能的机理为,中等皂化程度的刚棒直链型SMAA在聚合物"软粒子"表面能形成难以"回复"的有效保护层,使由剪切形成的变形聚合物"软粒子"在聚合过程中能保持形状和尺寸的稳定,从而得到梭形聚合物粒子.

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