中文摘要：

以异佛尔酮二异氰酸酯（IPDI）、聚碳酸酯二醇（PCDL）、蓖麻油（C．O）、二羟甲基丙酸（DMPA）及甲基丙烯酸甲酯（MMA）、丙烯酸丁酯（BA）为主要原料，采用自乳化法制备蓖麻油基水性聚氨酯预聚体，并以此为种子乳液进行丙烯酸酯单体的无皂乳液聚合，制备出了以蓖麻油基聚氨酯（CPU）为壳、聚丙烯酸酯（PA）为核的无皂核壳蓖麻油基水性聚氨酯-丙烯酸酯（CPUA）复合乳液.研究了蓖麻油对复合乳液及其胶膜性能的影响，并采用透射电镜（TEM）确认了复合乳液的结构，红外光谱（IR）、X 射线衍射（XRD）及热失重（TGA）分析研究了聚合物的结构及其性能.结果表明，当 C．O 与 PCDL 中-OH 物质的量之比为1∶3时，乳液性能稳定，胶膜具有良好的耐水性及力学性能.IR、XRD 及 TEM 表明 CPUA 间存在一定的交联，促进了硬段、软段间的相容性.与水性聚氨酯-丙烯酸酯（WPUA）相比，合成的 CPUA 热稳定性得以提高，胶膜拉伸强度高达111 MPa.

英文摘要：

A surfactant-free castor oil-based waterborne polyurethane-acrylic （CPUA）hybrid aqueous emulsion with castor oil-based polyurethane （CPU）as shell and polyacrylate as core was prepared via emulsifier-free emulsion copolymerization of the acrylate monomers （AC）in the presence of a commercial polyurethane disper-sion as seeds,which were synthesized by a self-emulsification method,using IPDI,PCDL,DMPA,castor oil （C.O）,MMA,BA as the main raw material.The effects of the content of C.O on the properties of composite e-mulsion and its films were studied systematically.The core-shell structure of the emulsion was observed by TEM,structure and properties of the polymer were studied by IR,XRD and TGA.The results supported the i-dea that when the molar ratio of -OH in C.O and PCDL was 1∶3,the CPUA hybrid emulsion exhibited excel-lent stable performance,and the film showed outstanding water resistance and mechanical properties.IR,XRD and TEM showed certain crosslinking between CPUA,and the compatibility between hard segment and soft segment were promoted.Compared with the PUA,the synthesized CPUA hybrid film has higher thermal stabil-ity with a tensile strength 1 1 1 MPa.