Issue 5, 2024

Regulation of mechanical properties and self-healing performance of polyurethane nanocomposites by tuning the contents of free and associated hydrogen bonds

Abstract

Hydrogen bonds facilitate self-healing of polymers. However, free and associated hydrogen bonds have different effects on mechanical properties and self-healing performance. Here, both unmodified nano-silica (nano-SiO2) and nano-SiO2 modified by 2-ureido-4[1H]-pyrimidinone (UPy) and KH-550 (UK–SiO2) were used to fill polyurethane (PU). The mechanical properties and self-healing properties of the PU nanocomposites can be regulated by changing the ratio of the two kinds of nano-SiO2. In the PU containing 2 wt% unmodified nano-SiO2 and 1 wt% UK–SiO2, the UK–SiO2 particles hinder the agglomeration of the unmodified nano-SiO2 particles and facilitate the formation of hydrogen bonds between PU chains and the nanofillers. More associated hydrogen bonds exist, resulting in a higher mechanical strength but a weaker self-healing ability. In the PU containing more UK–SiO2, the formation of hydrogen bonds between the unmodified nano-SiO2 particles and between the unmodified nano-SiO2 particles and PU chains is restricted by the UK–SiO2 particles, leading to a lower mechanical strength but a stronger self-healing ability.

Graphical abstract: Regulation of mechanical properties and self-healing performance of polyurethane nanocomposites by tuning the contents of free and associated hydrogen bonds

Supplementary files

Article information

Article type
Paper
Submitted
30 Sep 2023
Accepted
18 Dec 2023
First published
21 Dec 2023

Polym. Chem., 2024,15, 384-396

Regulation of mechanical properties and self-healing performance of polyurethane nanocomposites by tuning the contents of free and associated hydrogen bonds

A. Zhang, Q. Huang, X. Du, Y. Wang, J. Yang, S. Li, M. Zhu and Y. Nie, Polym. Chem., 2024, 15, 384 DOI: 10.1039/D3PY01098H

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