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Synthesis and structure/properties characterizations of four polyurethane model hard segments.


ABSTRACT: Four model polyurethane (PU) hard segments were synthesized by reaction of butanol with four typical diisocyanates. The four diisocyanates were aromatic 4,4'-diphenylmethane diisocyanate (4,4'-MDI) and MDI-50 (50% mixture of 2,4'-MDI and 4,4'-MDI), cycloaliphatic 4,4'-dicyclohexylmethane diisocyanate (HMDI) and linear aliphatic 1,6-hexamethylene diisocyanate (HDI). FTIR, 1H NMR, 13C NMR, MS, X-ray and DSC methods were employed to determine their structures and to analyse their crystallization behaviours and hydrogen bonding interactions. Each of the four PU compounds prepared in the present work displays unique spectral characteristics. The FTIR bands and NMR resonance peaks assigned in the four samples thus provide a reliable database and starting point for investigating the relationship between hard segment structure and the crystallization and hydrogen bonding behaviour in more complex-segmented PU compositions.

SUBMITTER: Jiang L 

PROVIDER: S-EPMC6083698 | biostudies-literature | 2018 Jul

REPOSITORIES: biostudies-literature

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Synthesis and structure/properties characterizations of four polyurethane model hard segments.

Jiang Lei L   Ren Zhiyong Z   Zhao Wei W   Liu Wentao W   Liu Hao H   Zhu Chengshen C  

Royal Society open science 20180725 7


Four model polyurethane (PU) hard segments were synthesized by reaction of butanol with four typical diisocyanates. The four diisocyanates were aromatic 4,4'-diphenylmethane diisocyanate (4,4'-MDI) and MDI-50 (50% mixture of 2,4'-MDI and 4,4'-MDI), cycloaliphatic 4,4'-dicyclohexylmethane diisocyanate (HMDI) and linear aliphatic 1,6-hexamethylene diisocyanate (HDI). FTIR, <sup>1</sup>H NMR, <sup>13</sup>C NMR, MS, X-ray and DSC methods were employed to determine their structures and to analyse th  ...[more]

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