摘要： 以不同相对分子质量的聚碳酸酯二元醇(PCDL)为主要原料与异佛尔酮二异氰酸酯 (IPDI)反应所得预聚体 PCDL-PUA，再分别用甲基丙烯酸羟乙酯(HEMA)和季戊四醇三丙烯酸酯(PET3A)为封端剂，合成了一系列光固化聚氨酯丙烯酸酯(PCDL-H-PUA和 PCDL-P-PUA)。用 FT-IR、GPC、UV光谱仪、拉伸测试表征所得产物结构和性能，分别考察 PCDL相对分子质量和封端剂对产物结构和性能的影响。结果表明:随 PCDL相对分子质量增大， PCDL-PUA相对分子质量和黏度增大，其固化膜杨氏模量逐渐减小，断裂伸长率增大;PET3A封端的 PCDL-P-PUA 相对分子质量、黏度和杨氏模量均大于 HEMA封端的 PCDL-H-PUA。所有 PCDL-PUA系列光固化漆膜性能均有优异的耐化学性。

关键词: 聚氨酯丙烯酸酯, 聚碳酸酯二元醇, 光固化

Abstract: Two UV-curable polyurethanes(PCDL-H-PUA and PCDL-P-PUA)were synthesized from a prepolymer made from polycarbonate diols (PCDL) with different molecular weight and isophrone di-isocyanate(IPDI), which was then reacted with hydroxyethyl methacrylate(HEMA) and pentaerythritol triacrylate(PET3A) to impart mono -methacrylate and tri-acrylate functionality to the end-capping group,respectively. The structures and properties of PCDL -PUAs were characterize by use of FT-IR. GPC. UV spectroscopy and tensile test. The results have shown that with the increasing of the molecular weight of PCDLs, the molecular weight and viscosity of the PCDL-PUAs were increased and the Young's modulus of the crosslinked film reduced. but the elongation at break increased. The molecular weight and viscosity of the PCDL -PUAs end-capped by PET3A were larger than those end-capped by HEMA, Young's modulus of the crosslinked film of the formers were larger than those of the latters, but the elongation at break were smaller. All the Uv-cured films of PCDL-PUA showed excellent chemical resistance.

Key words: polyurethane -acrylate, polycarbonate diols, UV-curing