偏氯乙烯-丙烯酸甲酯悬浮共聚树脂颗粒特性

Particle Features of Poly(vinylidene chloride-comethyl acrylate) Suspension Resins

对悬浮聚合聚偏氯乙烯和偏氯乙烯-丙烯酸甲酯(VDC-MA)共聚树脂的颗粒形貌和孔径分布进行了研究。发现不同MA含量的树脂基本呈规整球形,颗粒内部初级粒子聚集程度随MA含量增加而增加,孔隙率降低;当MA的质量分数为树脂的0～5%量,树脂颗粒内部存在孔径为0.1～1.0μm的孔隙;当MA的质量分数为10%时,以上尺寸的内部孔隙很少;当MA的质量分数为10%时,树脂无内部孔隙;这与聚合物结晶性随MA含量增加而降低,单体在聚合物中的溶胀能力增加有关。

The particle features and aperture distribution of poly(vinylidene chloride) and poly(vinylidene chloride-co-methyl acrylate) resins prepared by suspension polymerization were characterized. All resins showed the regular sphere structure, but the surface and internal morphology of resins was varied with the weight fraction of methyl acrylate (MA) in copolymers. The aggregate degree of primary particles was increased and the porosity decreased with the increase of MA copolymerized with vinylidene chloride. The internal pore with the size of 0.1～1.0 m were existed in resins with 0～5 % MA content, and could seldom found in the resin with 10% MA. The particles with smooth surface and no internal pores were formed when 15 % MA were copolymerized with vinylidene chloride. The above morphology was caused by the decreased crystallinity and increased swelling of monomers in polymer as the weight fraction of MA increased.