缩聚物/加聚物复合胶乳的制备科学Ⅱ.核壳结构聚氨酯-丙烯酸酯复合乳液的合成与表征  

THE SYNTHESIS AND CHARACTERIZATION OF POLYURETHANE-ACRYLIC GRAFT EMULSION

作　　者：游波[1] 武利民[1] 李丹[1] 邹丽珺[1] 

机构地区：[1]复旦大学材料科学系,上海200433

出　　处：《高分子材料科学与工程》2003年第1期84-88,共5页Polymer Materials Science & Engineering

基　　金：国家自然科学基金 ( 5 9873 0 0 4);教育部回国留学人员基金资助项目

摘　　要：用合成的含羧基端羟基聚氨酯树脂 ,通过强外力乳化可形成稳定的水性聚氨酯乳液 ,与苯乙烯和丙烯酸丁酯等单体共聚 ,合成具有核壳结构的聚氨酯 -丙烯酸酯接枝乳液。通过接枝乳液和共混乳液的性能差别对比 ,及 DSC、FT- IR、粒径分析及力学性能测试分析表明 ,在聚氨酯 -丙烯酸酯接枝乳液中 ,聚氨酯与丙烯酸酯发生部分交联形成稳定的核 -壳结构。文中还对聚氨酯The OH-functional polyurethane resin was prepared by IPDI, diols and carboxylic acid fuctional diol DMPA. The polyurethane resin was formulated to have an OH/NCO (hydroxyl/isocyanate) ratio of 1.2~1.5, it will provide hydroxyl-terminated polymer and lower average molecular weight ( w=3500, n=1100). Upon neutralization of the acid groups, this oligomer was dispered in water by emulsifying mechanically by using anionic and nonionic emulsifiers to produce the polyurethane emulsion. The synthesis of polyurethane-acrylic graft emulsion with core-shell structure was reported. The polyurethane-acrylic blend emulsion was compared with the polyurethane-acrylic graft emulsion by DSC, FT-IR, particle size analysis, and mechanical property, ect. It shows that the graft emulsion particle morphology consists of a polyurethane-acrylic core surrounded by a acrylic shell. The intimate molecular mixing of graft polymers are also claims to result in a superior balance of properties compared to physical blends of polyurethane emulsions and acrylic emulsions. The cross-linking mechanism of polyurethane-acrylic graft emulsion was discussed and predicted.

关 键 词：缩聚物 加聚物 复合胶乳 制备 核壳结构 聚氨酯-丙烯酸酯复合乳液 合成 表征 接枝乳液 交联机理 

分 类 号：TQ323.8[化学工程—合成树脂塑料工业] TQ325.7