以异佛尔酮二异氰酸酯(IPDI)、聚己内酯二元醇(PCL1000)、甲基丙烯酸甲酯(MMA)、丙烯酸丁酯(BA)、二羟甲基丁酸(DMBA)、甲基丙烯酸羟乙酯(H EMA)等为主要原料,采用原位聚合法,合成了聚氨酯丙烯酸酯复合乳液.研究了烯基单体不同时机不同添加量对预聚体的流变行为、共聚物性能以及分散液光散射强度的影响,并通过傅里叶红外光谱(FT-IR)及核磁共振仪(NMR)测定胶膜的结构.TEM及粒径分析表明,复合乳液微粒呈球形,核壳结构,随着前期加入乙烯基单体量增多,呈非牛顿性流体行为乳液黏度逐渐降低,微粒粒径从62．96 nm 增至78．86 nm,凝胶率则从4．21％降至0．11％,胶膜吸水率从12．19％降至8．22％,并通过动态光散射法,研究了乙烯基单体前后不同加入比例情况下的聚合历程.
A series of Polyurethane-acrylate microemulsion (PUA)with different adding time and different adding amount of ethylene segments was prepared through in-situ polymerization,using isophorone diisocyanate (IPDI),polycaprolactone diols(PCL1000),methyl methacrylate(MMA),butyl acrylate(BA),2,2-dimethylol-butyric acid(DMBA)and 2-Hydroxyethyl Methacrylate(HEMA)as raw materials.Effects of the ethylene seg-ments with different adding time and different adding amount on rheology study of polyurethane prepolymer and properties of polyurethane-acrylate microemulsion and films were systematically studied,as well as the scatter-ing intensity of the dispersion under different reaction times.The hybrid emulsion was characterized by FT-IR and NMR.It was found that the dispersion particle displayed as core/shell spherical morphology.At the same time,the particle size of PUA microemulsion increased from 62.96 to 78.86 nm by TEM,submicron particle size analyzer and water absorption of PUA coating film decreased from 12.19% to 8.22%,while the coagulation ratio decreased from 4.21% to 0.11% and the viscosity also decreased,presenting non-Newtonian flow behavior as increasing the amount of pre-added ethylene segments.The emulsion polymerization process of PUA was studied by dynamic light scattering method.
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