含氟聚氨酯的微相分离及热稳定性Microphase separation and thermal stability of fluorinated polyurethane
雷雁洲
摘要(Abstract)：
以聚四氢呋喃醚二醇(PTMG)、甲苯二异氰酸酯(TDI)为原料制备了4种预聚体,分别以3,3′-二氯-4,4′-二氨基二苯基甲烷(MOCA)和2,2-双[4-(4-氨基苯氧基)苯基]六氟丙烷(BAPF)为扩链剂,制备了两个体系的热塑性聚氨酯(TPU)和含氟热塑性聚氨酯(F-TPU)。通过傅里叶转变红外光谱分析、广角X-射线衍射分析、动态流变测试绘制的Cole-Cole曲线和Han曲线,研究了体系中氟元素含量、氢键和微相分离之间的关系。通过热重分析表征了两个体系TPU的热稳定性能。结果表明,由于极强的电负性,体系中的氟原子与―CH_2―和―NH―中的氢原子形成氢键,加剧硬段和软段的相分离程度;且由于C―F键的高键能,氟元素的引入对材料热稳定性的提高有较大助益,F-TPU随着氟元素含量从w=2.7%增加到w=5.4%,起始分解温度T5%提高了29.1℃。
关键词(KeyWords)： 含氟聚氨酯;氢键;微相分离;热稳定性
基金项目(Foundation):
作者(Author): 雷雁洲
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