多嵌段聚氨酯脲硬段模型化合物的合成和结构研究

Synthesis and Structure Study of Hard-Segment Model Compounds in Poly(urethane urea)Block Copolymers

多嵌段聚氨酯脲硬段模型化合物的合成和结构研究罗宁，王得宁，应圣康（华东理工大学材料科学研究所，上海，２００２３７）关键词３，５－二乙基甲苯二胺，４，４′－二苯基甲烷二异氰酸酯，氢键，微晶，热分析３，５－二乙基甲苯二胺（ＤＥＴＤＡ）是目前反应注射成型（...

A series of hard-segment model compounds based on 3,5-diethyltoluene diamine,4,4'-diphenylmethane diisocyanate and phenyl isocyanate has been synthesized in this paper.The model compounds are microcrystals.Combined with WAXD analysis,the assignment of the bands at 1643 cm(-1)and 3290 cm(-1)in the FTIR spectra of the model compounds is given.Both bands are the hydrogen-bonded urea carbonyl and urea NH groups with the form of planarly bifurcated hydrogen bonds in the microcrystals,respectively.Melting points of the model compounds are almost the same as the change of average degree of polymerization by DSC experiments.