摘要
在甲基丙烯酸甲酯(MMA)和丙烯酸正丁酯(BA)的无皂乳液共聚体系中,加入适量反应性乳化剂w-十一烯酸钠(SUA),在用量远低于其CMC时,分别讨论了SUA浓度、引发剂(K_2S_2O_8)浓度以及离子强度对反应动力学的影响,用SA-CP3型粒度分布仪、透射电镜(TEM)等考察了乳液粒子大小(D_w)、浓度(N_p)、形态及其增长过程;用凝胶渗透色谱仪、红外光增、离子交换-电导滴定等手段探讨了反应机理。结果表明:在该反应体系中,“均相沉淀”与“胶束”成核两种机理同时存在,两种成核方式几率的相对大小由SUA浓度、离子强度等所决定。
Emulisifier-free copolymerization of methyl methacrylate (MMA) and butyl acrylate (BA) in the presence of surface active comonomer, Sodium undecylenic acid (at concentration below its CMC) are carried out. The influence of polymerization conditions such as SUA content, KPS content and ionic-strength on kinetics are examined. The particle diameter, number , morphology, growing process,as well as polymerization mechanism are studied by means of Particle Size Analysizer,TEM, GPC,IR Spectra and Ionic-Exchange-Conductimetric titra-tion. The results indicated that particles are generated through a combination of homogeneous nucleation and micellar nucleation mechanism.
出处
《高分子学报》
SCIE
CAS
CSCD
北大核心
1993年第3期296-303,共8页
Acta Polymerica Sinica
关键词
甲基丙烯酸酯
丙烯酸正丁酯
共聚合
Kinetics,Mechanism, Homogeneous precipitation nucleation, Micellar nucleation
