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Synergistic effect of covalent cross‐linking and physical hydrogen bonding associations on the mechanical properties of polyurethane thermoset elastomers.

Authors :
Zhou, Yu
Wu, Fang
Zhu, Liyang
Geng, Zhishuai
Yang, Rongjie
Zhai, Jinxian
Source :
Journal of Applied Polymer Science; 11/10/2024, Vol. 141 Issue 42, p1-10, 10p
Publication Year :
2024

Abstract

Thermoset materials, known for their stable topology structure, have garnered significant interest in recent years for their applications in coatings, foam, adhesives, and other fields. In general, the low chemical crosslinking density of thermoset materials means poor mechanical properties. In this study, we adjusted the topological structure of thermoset elastomers through formula design and controlled their hard segment content at the same level. The mechanical tensile test results show that as the chemical crosslinking density of the elastomer decreases, the fracture tensile strength shows a trend of first increasing and then decreasing. Although the content of amino ester groups in the elastomer is the same, low field nuclear magnetic resonance and Fourier transform infrared analysis show that as the density of the chemical cross‐linking network decreases, more physical cross‐linking points are formed between the elastomer network chains. Furthermore, the polyurethane hard segment formed an amorphous microphase separation structure in the elastic matrix. This study proves that constructing a moderate physical hydrogen bonding association structure between the network chains in polyurethane cross‐linked thermoset elastomers is another important way to prepare thermoset elastomers with excellent mechanical properties. [ABSTRACT FROM AUTHOR]

Details

Language :
English
ISSN :
00218995
Volume :
141
Issue :
42
Database :
Complementary Index
Journal :
Journal of Applied Polymer Science
Publication Type :
Academic Journal
Accession number :
180044946
Full Text :
https://doi.org/10.1002/app.56114