论文部分内容阅读
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。
In this paper, the C-13 NMR of a polyurethane solution composed of polybutylene adipate (number-average molecular weight 2000), 4,4-diphenylmethane diisocyanate (MDI) and chain extender 1,4-butanediol The relationship between the spin-lattice relaxation time (T_1) and temperature was studied. The deprotection of polyurethane (40-90 ℃) with different temperature (40-90 ℃) was measured by using JEOL FX-60Q nuclear magnetic resonance spectrometer in deuterated dimethyl sulfoxide solution Based on the T_1 values of CH_2 and CH carbons on different blocks in the chain, the relationship between the movement of polyurethane molecular chains with temperature and the relationship between structure and properties was analyzed and discussed.