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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6.8 mm,宽度1.4 mm,厚度0.5 mm,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.
The hydrolysis of styrene-maleic anhydride alternating copolymer (SMA) with potassium hydroxide resulted in a SMA-hydrolyzed product (SMAA) with a moderate degree of saponification which had a rigid rod-like linear configuration in aqueous solution. This particular structure of the macromolecule The dispersant was used for the suspension polymerization of styrene. Fusillic polystyrene particles were obtained by controlling the stirring speed and the oil-water ratio. Under the optimal conditions, the average length of the particles was 6.8 mm, the width was 1.4 mm, the thickness was 0.5 mm and the aspect ratio was about 5.0 The possible mechanism is that SMA with moderate degree of saponification can form an effective protective layer on polymer “soft particle ” surface, which makes the deformation polymer formed by shear “Soft particles” maintain their shape and size stability during the polymerization, resulting in fusible polymer particles.