表面活性单体DMBAC光聚合动力学研究

采用偶氮二异丁脒盐酸盐(AIBA)作为光引发剂,光引发聚合并研究了阳离子表面活性单体——甲基丙烯酰氧乙基二甲基苄基氯化铵(DMBAC)的均聚及其与丙烯酰胺(AM)共聚合反应的动力学行为,聚合反应均在高于DMBAC临界胶束浓度(CMC)的条件下进行.研究结果显示DMBAC均聚合反应速率与引发剂浓度的0.29次方以及单体浓度的0.89次方成正比,均聚合反应的表观活化能约为13.74 kJ/mo1;DMBAC与AM共聚合反应速率与引发剂浓度的0.82次方以及单体总浓度的0.83次方成正比,共聚合反应的表观活化能约为10.97 kJ/mo1;同时测得DMBAC与AM共聚合反应的单体竞聚率为r₁=0.27(AM)、r₂=2.00(DMBAC),说明AM趋向于形成共聚物,而DMBAC更趋向于形成均聚物.

Kinetics Study of Photopolymerization of Surfactant Monomer (Surfmer) DMBAC

Kinetic behaviors of the homopolymerization of(N,N-Dimethyl-N-methacryloyl oxyethyl-N-benzyl)ammonium chloride(DMBAC) and the copolymerization between DMBAC and AM were studied.Polymerizations were carried out above the critical micelle concentration(CMC) of DMBAC,and the initiation process was carried out photochemically using 2,2'-Azobis(2-methylpropionamidine) dihydrochloride(AIBA)as a photoinitiator.The results indicate that the rate of the homopolymerization is proportional to the concentration of photoinitiator and monomer with exponents of 0.29 and 0.89,respectively,the apparent activation energy is about 13.74 kJ/mo1.The rate of copolymerization is proportional to the concentration of photoinitiator and monomers with exponents of 0.82 and 0.83,respectively,the apparent activation energy is about 10.97 kJ/mo1.The reactivity ratios of r1 0.27 for AM and r2 2.00 for DMBAC were also obtained,which suggests that AM prefers to form copolymers whereas DMBAC produces homopolymers.