高官能度水性聚氨酯丙烯酸酯/纳米SiO2杂化材料的制备及性能

以聚己内酯二醇(PCL)、异佛尔酮二异氰酸酯(IPDI)、二羟甲基丙酸(DMPA)和季戊四醇三丙烯酸酯(PETA)为原料,合成了高官能度水性聚氨酯丙烯酸酯WPUA。以WPUA为有机相,γ-甲基丙烯酰氧丙基三甲氧基硅烷(TMSPM)改性纳米SiO2为无机相,制备了水性光固化有机/无机纳米杂化体系。通过傅立叶变换红外光谱对合成产物进行了表征,并对杂化薄膜的表面形貌、热稳定性、光固化动力学及力学性能进行了分析。结果表明合成了预期产物,杂化体系中改性纳米SiO2分散均匀稳定;随着SiO2含量的增加,材料的热稳定性、力学性能均有明显提高;不同SiO2条件下体系均保持了较高的光固化速率和最终凝胶含量。

Preparation and Properties of Multifunctional Waterborne Polyurethane Acrylate/Nanosilica Hybrid Materials

A novel multifunctional UV-curable waterborne polyurethane acrylate (WPUA) was synthesized from polycaprolactone diols(PCL), isophorone diisocyanate(IPDI), dimethylol propionic acid (DMPA) and pentaerythritol triacrylate(PETA). Waterborne UV-curable hybrid materials were prepared from WPUA as organic phase and γ-trimethoxysilyl-propyl methacrylate (TMSPM) modified nanosilica as inorganic phase. The structure of products was characterized by FT-IR spectrum, and the surface morphology, thermal stability, UV curing kinetics and mechanical properties of hybrid films were investigated. The results showed that the structure was identified and the modified nanosilica was dispersed into hybrids homogeneously and stably. Furthermore, it has been found that the thermal stability and mechanical properties of hybrid films were improved with the addition and increase of nanosilica, while the curing rate and final gel content were still in good levels.