Issue 16, 2023

Synthesis of polyisocyanurate prepolymer and the resulting flexible elastomers with tunable mechanical properties

Abstract

Polyurethane (PU) is used in a wide range of applications due to its diverse chemical and physical properties. To meet the increasing demands on thermal and mechanical properties of PU materials, polyisocyanurates (PIRs) have been introduced in PU materials as crosslinkers and due to their high decomposition temperature. We prepared a liquid PIR prepolymer with high PIR content by co-trimerization of 4,4′-methylene diphenyl diisocyanate (4,4′-MDI) and mono-isocyanates. The mono-isocyanate was synthesized via reaction between a 4,4′-MDI and a 2-ethyl-1-hexanol. The PIR prepolymer obtained was further reacted with long chain polyols and chain extenders in both solvent and solvent-free conditions, leading to PIR elastomers that exhibited good thermal stability with high char formation, and improved mechanical properties with much higher Young's modulus. This work demonstrates that the liquid PIR prepolymer can potentially be used in various large-scale industrial applications.

Graphical abstract: Synthesis of polyisocyanurate prepolymer and the resulting flexible elastomers with tunable mechanical properties

Supplementary files

Article information

Article type
Paper
Submitted
02 Feb 2023
Accepted
24 Mar 2023
First published
27 Mar 2023
This article is Open Access
Creative Commons BY-NC license

Polym. Chem., 2023,14, 1923-1932

Synthesis of polyisocyanurate prepolymer and the resulting flexible elastomers with tunable mechanical properties

Y. Guo, J. Kleemann, S. Bokern, A. Kamm, R. P. Sijbesma and Ž. Tomović, Polym. Chem., 2023, 14, 1923 DOI: 10.1039/D3PY00124E

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