可光聚合含硅聚氨酯丙烯酸酯水性低聚物的合成与性能：碳碳双键含量的影响

通过引入不同含量的2，2-双（羟甲基）丙烯酸丁酯（HBA），合成了一系列不同双键含量的可光聚合含硅聚氨酯丙烯酸酯水性低聚物（HBA-WSiPUA），它们均可以形成稳定的白色乳液，且粒径分布均匀。详细研究了低聚物中双键含量对低聚物的光聚合行为和光固化膜的热性能、物理力学性能及表面性能的影响，结果表明：所合成的低聚物的最终双键转化率均在90%以上；随着双键含量增加，光固化膜的拉伸强度、硬度、初始分解温度和玻璃化转变温度都随之增加，最高分别可达15.2 MPa、6H、286 ℃和80 ℃，而光固化膜的断裂伸长率、表面水接触角和吸水率则随之降低，吸水率最低可至2.5%。

Synthesis and properties of photopolymerizable silicone-containing polyurethane acrylate water-borne oligomers：effect of carbon-carbon double bond content

A series of photopolymerizable silicon-containing polyurethane acrylate water-borne oligomers (HBA-WSiPUA) with different double bond contents have been prepared by changing the content of 2,2-bis(hydroxymethyl) butyl arylate (HBA). The oligomers all formed a stable white emulsion with uniform particle size distribution. The effect of the content of double bonds in the oligomers on their photopolymerization behavior, and the thermal properties, physical and mechanical properties, and surface properties of UV-cured films of the materials were studied in detail. The results show that the double bond conversions of the oligomers were all above 90%. As the double bond content increased, the tensile strength, hardness, initial decomposition temperature and glass transition temperature (T_g) of the UV-cured films increased, reaching maximum values of 15.2 MPa, 6 H, 286 ℃ and 80 ℃, respectively. With increasing double bond content, the elongation at break, surface water contact angle and water absorption decreased, with the water absorption reduced to a minimum of 2.5%.