A Highly Self-healable Elastomer Based on Urea Oligomer With Excellent Mechanical Properties and Outstanding Long-term Storage Stability
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초록
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We demonstrate a highly self-healable elastomer based on urea oligomer (shEUo) in this study. Acrylate-based polyol, urea oligomer with isocyanate groups at both ends, and crosslinker containing multiple isocyanate groups are blended and the resulting blended precursor is reacted to generate shEUO. As a reference, conventional urea-containing elastomer (cEU) is prepared through the traditional one-pot synthesis where urea groups are randomly distributed in cEU. Interestingly, the blended precursor of shEUo shows outstanding long-term storage stability at room temperature compared to that of cEU. In addition, shEUo exhibits better self-healing performances and mechanical properties than cEU or conventional elastomer without urea groups. This demonstrates that conventional elastomer can achieve both superior self-healability and mechanical properties by incorporating urea oligomer where multiple urea groups are serially connected.