光聚合型聚硅氧烷改性聚醚聚氨酯丙烯酸酯低聚物的合成、表征与性能

以羟烷基聚硅氧烷(Q4-3667)、聚丙二醇(PPG-2000)、异佛尔酮二异氰酸酯(IPDI)、二乙醇胺和丙烯酸β-羟乙酯(HEA)为原料合成了一种光聚合型有机硅改性聚醚聚氨酯丙烯酸酯低聚物(Si~5E~5PUA),并用傅里叶红外光谱(FTIR)、核磁共振氢谱(1HNMR)、核磁共振硅谱(29SiNMR)和凝胶渗透色谱(GPC)对其结构进行了表征。详细研究了Si~5E~5PUA与不同单体配比体系的黏度、光聚合性能、聚合过程的体积收缩及其固化膜的玻璃化转变温度。结果表明,Si~5E~5PUA与丙烯酸酯单体具有良好的相容性;其体系具有优异的光聚合性能,最终双键转化率达90%以上,单体官能度的增加可以提高固化膜的玻璃化转变温度,Si~5E~5PUA体系的体积收缩在3.3%~5.6%。

Synthesis, Characterization and Performances of UV-curable Polysiloxane-modified Polyether Polyurethane Acrylate Prepolymer

An UV-curable polysiloxane-modified polyether polyurethane acrylate prepolymer (Si5E5PUA) was synthesized with polysiloxane (Q4-3667), polypropylene glycol (PPG-2000), isophorone diisocyanate (IPDI), diethanolamine and hydroxy ethyl acrylate (HEA) as raw materials. The structure of Si5E5PUA was characterized by Fourier infrared spectrometer (FT-IR), nuclear magnetic resonance (1H NMR and 29Si NMR) and gel permeation chromatograph (GPC). The viscosity, photopolymerization behavior and volume shrinkage in polymerization processes of Si5E5PUA systems with different monomers and glass transition temperatures of cured films were investigated. The results showed that the Si5E5PUA exhibited good compatibility with acrylate monomers. The systems of Si5E5PUA with different monomers had excellent photopolymerization efficiency and final double bond conversion was over 90%. The increase of functionality of the monomers could enhance the glass transition temperatures of cured films. The volume shrinkage of Si5E5PUA systems ranged from 3.3% to 5.6%.