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。
With the action of cosolvent and polymer colloid-resistant stablizer, the surfactant - free emulsion copolymerization of styrene （St）, methylmethacrylate （ M MA） and mono - butyl maleate （mono - BM ） was carried out in batch process. Effects of concentration of monomer, PVA, [APS] and polymerization temperature （T） on the kinetics of the polymerization were investigated. It was found out that Rp ∝ [ M ]^2.38, MArbitaryw ∝[ M ]^0.62 ; Rp ∝ [ I]^883, M Arbitary 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.
出处
《热固性树脂》
CAS
CSCD
2005年第5期13-17,共5页
Thermosetting Resin
基金
国家自然科学基金项目(20376043)
陕西省自然科学基金项目(2003B02)
关键词
高分子助溶稳定剂
三元无皂乳液共聚
动力学
polymer colloid stablizer
ternary emulsifier-free emulsion copolymerization
kinetic
