摘要
本文对由聚己二酸丁二醇酯(数均分子量为2000),4,4二苯基甲烷二异氰酸酯(MDI)和扩链剂1,4一丁二醇形成的聚氨酯溶液的 C—13NMR 自旋晶格弛豫时间(T_1)与温度的相关性进行了研究,在氘代二甲基亚砜溶液中,应用JEOL FX—60Q 核磁共振仪测定了不同温度下(40—90℃)聚氨酯链上不同嵌段上 CH_2及 CH 碳的 T_1值,利用所得数据对聚氨酯分子链运动随温度的变化及结构与性能的关系进行了分析和讨论。
The Dependence of Carbon-13 NMR spin-lanttic relaxation time(TL)on tempera-ture have been studied for the protoned carbons of polyurethanes(PU)based on polybutyleneadipate diol,4,4'-diphenylmethane diisocyanate(MDI)and 1,4-butanediol (BDO).From 40 to 90℃,the T1 values of protoned Carbons in different blocks and posi- tions of polyurethanes(PU)have been measuered with JEOL FX-600 NMR spectrometer in DMSO-d6 solution.The dependence of molecular motion on temperature and the rela-tion between structure and physical properties of polyurethanes(PU)were discussed and analazed.
出处
《河南科学》
1990年第3期55-58,共4页
Henan Science
