摘要
将聚氨酯预聚体可聚合乳化剂 (APUA)和甲基丙烯酸甲酯 (MMA)的复合微乳液体系 ,分别用水溶性过硫酸钾 (K2 S2 O8)和油溶性偶氮二异丁腈 (AIBN)作引发剂 ,进行微乳液聚合研究 ,制备了P(MMA UA)复合纳米乳胶粒子 .研究了APUA用量、聚合温度对聚合动力学的影响 ;用透射电子显微镜 (TEM)观察了不同乳化剂浓度及引发剂体系对胶粒形态、大小及分布的影响 .结果表明 ,用可聚合乳化剂APUA可制得稳定性很好的P(MMA UA)纳米级核 壳型乳胶粒子 ,乳胶粒径在 5 0nm左右 .随着乳化剂用量增加 ,粒子变小 ;不同类型的引发剂对胶乳的性质有较大影响 ,以APUA为乳化剂 ,K2 S2 O8为引发剂 ,在聚合反应过程中或在聚合反应后的放置中 ,会出现P(MMA UA)的纳米水凝胶 (Nanogel)现象 .
Composite microemulsion of anionic polyurethane acrylate polymerizable emulsifier (APUA) and MMA was polymerized with AIBN and K 2S 2O 8 as initiator respectively,and the nanometer core shell latex particle was synthesized.In the latex particles polyurethane is as the shell of the latex particles and PMMA as the core.Effects of APUA content and polymerization temperature on polymerization kinetics were studied.Influences of different initiators and emulsifier concentration on morphology and size of latex particles were observed by TEM.The results suggest that stable core shell P(MMA UA) nanometer latex particle can be synthesized by polymerizable emulsifier APUA,and the particle size is about 50 nm; with increasing APUA emulsifier content,size of latex particles decrease. Effects of different kind of initiators on properties of latex were significant.When APUA was used as emulsifier and K 2S 2O 8 as initiator,hydrogel of P(MMA UA)may appear during polymerization or storing.
出处
《高分子学报》
SCIE
CAS
CSCD
北大核心
2002年第3期309-313,共5页
Acta Polymerica Sinica
基金
国家自然科学基金资助项目 (基金号 2 99740 0 7)
