Study on the synthesis of high elongation polyurethane

Fangxing Li, Ju Zuo, Limei Dong, Hongjun Wang, Jiazhong Luo, Weirong Han, Yujie Huo

Research output: Contribution to journalArticlepeer-review

25 Scopus citations

Abstract

In this paper, polyurethane (PU) was synthesized in the following steps: first, polytetramethaneoxy glycol (PTMG) prepolymerizes with 4-4′-diphenylmethane diisocyanate (MDI) at a molar ratio of 1:2; then, the prepolymer continuously reacts with 1,4-butanediol (BD) or hexanedimine (HD) to extend the polymer chain. A series of PU samples could be synthesized by reducing the amount of chain extender. The change in extensibility of PU with the amount of chain extender was investigated. The results indicate that the extensibility of PU could be improved greatly with a reduction of the amount of chain extender. This could be ascribed to the fact that excessive -NCO groups can react with the hydrogen atoms in -NHCOO-, and form branch chains. When the molecular weight of PTMG is 1684, with BD as the chain extender, the ultimate elongation of PU was 2280%; when HD was the chain extender, the ultimate elongation of PU was 1809%. The submicroscopic structure of the samples was found to be amorphous by the method of small angle laser light scattering, and these samples could dissolve in dimethyl formamide (DMF). The influence of DMF on the polymerization was also investigated.

Original languageEnglish
Pages (from-to)59-66
Number of pages8
JournalEuropean Polymer Journal
Volume34
Issue number1
DOIs
StatePublished - Jan 1998

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