丙烯酸酯类聚氨酯材料耐候性的研究

Research on the weathering resistance of poly(urethane-methacrylate) materials

以异佛尔酮-二异氰酸酯(IPDI)、聚四氢呋喃1000(PTMEG-1000)、聚乙二醇400(PEG-400)、甲基丙烯酸-β-羟乙酯(HEMA)为基本原料,合成了一类丙烯酸酯类聚氨酯大单体,然后用偶氮二异丁腈(AIBN)引发大单体聚合制备了一种高透明性的耐候性聚氨酯(PU)材料.利用FT-IR,XRD对所制备的PU材料进行表征和分析;通过冷冻和紫外光老化处理实验,研究了PU材料的耐候性.结果表明,PTMEG-1000含量的增加能显著提高PU材料的光学性能和热稳定性,PU材料在冷冻和紫外光照射条件下,综合性能与常温下相差不大,表明其具有良好的耐候性.其中PU-3材料的综合性能较佳,其常温下透光率为92.1%,拉伸强度为13.1 MPa;在-26℃下透光率为84.7%,拉伸强度为15.7 MPa;经紫外光辐射后其透光率为74.3%,拉伸强度为11.5 MPa.

Poly（urethane-methacrylate）macromonomers were synthesized based on isophorone diisocyanate （IPDI）,poly （tetrahydrofuran ） 1000 （PTMEG-1000 ）,poly （ethylene glycol ）400 （PEG-400 ） andβ-hydroxyethyl methacrylate （HEMA）.Then high transparent poly（urethane-methacrylate）materials with weathering resistance were prepared by the polymerization of the macromonomers using 2,2-azo-bis-iso-bu-tyro-nitrile （AIBN）as initiator.The obtained PU materials were characterized by FT-IR and XRD.The weathering resistance of PU materials was characterized under the condition of freezing and UV-irradiation. The results showed that the thermal stability and optical performance of PU materials increased with increasing PTMEG-1000 content,and comprehensive performance in freezing and UV-irradiation conditions were almost the same results as at room temperature,which indicated the materials owned good weather-ability.PU-3 exhibited outstanding performance.The tensile strength and the transmittance of PU-3 were 13.1 MPa and 92.1% at room temperature,respectively.Its tensile strength and transmittance were＆amp;nbsp;15.7 MPa and 84.7%at -26 ℃,respectively.And its tensile strength and transmittance were 11.5 MPa and 74.3% after UV-irradiation,respectively.