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

Abstract

Abstract: 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^-1and 3290 cm^-1in 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.

Key words: DiethyItoluene diamine, 4,4'-Diphenylmethane diisocyanate, Hydrogen bond, Microcrystal, Thermal analysis

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LUO Ning, WANG De-Ning, YING Sheng-Kang. Synthesis and Structure Study of Hard-Segment Model Compounds in Poly(urethane urea)Block Copolymers[J]. Chem. J. Chinese Universities, 1995, 16(6): 986.

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

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