标题：Determination of Crosslinking and Grafting in Polyurethane-acrylic Hybrid Material and Their Theoretical Calculations
作者：Jiang Xu-bao; Zhu Xiao-li; Zhang Zhi-guo; Kong Xiang-zheng; Tan Ye-bang
作者机构：[Jiang, X.-B] College of Chemistry and Chemical Engineering, Shandong University, Jinan 250100, China, College of Chemistry and Chemical Engineering, 更多
通讯作者地址：[Kong, XZ]Univ Jinan, Coll Chem & Chem Engn, Jinan 250022, Peoples R China.
关键词：Polyurethane;Graft copolymer;Hybrid latex;Grafting calculation;Coupling agent
摘要：A theoretical method to calculate the mode of polyurethane(PU) prepolymers grafted to polyacrylic(PAC)was presented. Using hydroxyethyl acrylate(HEA) as coupling agent, polyurethane-acrylics(PU-AC) hybrid latexes were prepared with varying HEA level and the reaction of HEA with PU prepolymers at different temperatures, and PU grafted to PAC was experimentally determined. The results show that PU grafted to PAC regularly increased, and the non-grafted and linear free PU regularly decreased with increase in HEAMCO(isocyanate group). The grafted PU on PAC was not proportional to HEA. More than half of linear PU prepolymers were grafted to PAC when HEA was at a low level with HEA/NCO at 0.33. While grafted PU increased to 84.80%(mass fraction), when HEA/NCO increased to 1.0. The results were interpreted based on the theoretical calculation of PU grafted to PAC by the present method.