【摘要】 在PVA助溶稳定剂的作用下,通过间歇法无皂种子乳液聚合制备了St/MMA/(mono-BM)三元共聚物。研究了单体总浓度[M],引发剂浓度[I],PVA浓度[P],聚合温度对St/MAA/(mono-BM)无皂种子乳液聚合动力学的影响。实验表明:Rp∝[M]2.38,-M w∝[M]0.62;Rp∝[I]0.883,-M w∝[I]-0.71。采用粒度测定仪,凝胶色谱和示差扫描量热法表征了共聚物乳液。粒度分析显示乳液总平均粒径为55 nm;DSC谱图显示三元共聚物只有单个Tg,聚合体系不存在微相分离区;GPC谱表明共聚物分子质量分布仅为1.28,接近单分散体系。更多还原

【Abstract】 With the action of cosolvent and polymer colloid-resistant stablizer,the surfactant-free emulsion copolymerization of styrene（St）,methylmethacrylate（MMA） and mono-butyl maleate（mono-BM） was carried out in batch process.Effects of concentration of monomer,PVA, and polymerization temperature（T） on the kinetics of the polymerization were investigated.It was found out that R_p∝[M]^2.38,_w∝[M]^0.62;R_p∝[I]^0.883,_w∝[I]^-0.71.The emulsions were subsequently characterized by granulometer,gel permeation chromatography（GPC）,and differential scanning calorimetry（DSC）.Granulometer showed the average particle radius of emulsions was 55 nm;DSC and GPC characterize the terpolymer had only one glass-transition temperature and molecular weight distribution was 1.28,which indicated that there didn′t exist any microphase-separating structure and St/MMA/（mono-BM） emulsifier-free emulsion was approaching to monodisperse system.更多还原