光固化丙烯酸化聚氨酯的合成及力学性能

SYNTHESES AND MECHANICAL PROPERTIES OF PHOTOCURABLE POLYACRYLOURETHANES

以２，４－ＴＤＩ、丙烯酸β－羟丙酯、聚乙二醇（不同分子量）、正一元醇为原料，合成了８种新的光固化丙烯酸化氨基甲酸酯。用元素分析、ＩＲ、ＵＶ、蒸气压渗透法，对它们进行了表征和鉴定，测试了它们光固化后的力学性能与曝光时间的关系。结果表明，随固化时间增长，玻璃化温度Ｔｇ、模量Ｅ、断裂强度都随之而增大；到一定固化时间后，Ｔｇ、Ｅ、断裂强度保持不变，断裂伸长率在某一固化时间出现一最大值。

In this paper,eight acrylated-urethane monomers were synthesized from 2,4-TDI,reacted with different molecular weight polyethylene glycol (PEG),n-aliphatic alcohol and hydroxypropyl acrylate.These monomers were characterized by IR, UV,element analysis and VPO.The mechanical properties of polyacrylourethanes were investigated.Tg, ultimate strength,Young's modulous E increased with the duration of irradiation time and ultimate strength,E reached a maximum,because the crosslinking density did not increase after further irradiation.