一种自修复可回收抗蠕变聚氨酯弹性体的制备方法
Dynamically covalently crosslinked polyurethane elastomers formed by polymerizing chiral cyclic diamine chain extenders with diisocyanates and other materials have solved the problems of difficult recycling of thermosetting materials and poor creep resistance of thermoplastic materials, achieving excellent creep resistance at high temperatures and self-healing recyclability of the materials.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- SICHUAN UNIV
- Filing Date
- 2024-11-20
- Publication Date
- 2026-07-17
AI Technical Summary
Existing thermosetting polyurethane materials are insoluble and infusible after curing, making repair and recycling difficult. Furthermore, thermoplastic polyurethane materials have poor creep resistance and heat resistance, making it difficult to meet the needs of long-life components.
A chiral cyclic diamine is used as a chain extender to polymerize with diisocyanate, high molecular weight diol/amine and crosslinking agent to form a self-healing, recyclable, creep-resistant polyurethane elastomer with a dynamic covalent crosslinking structure. The material is recycled and reused by utilizing the exchange reaction of urea groups at high temperature.
The material exhibits excellent creep resistance at high temperatures and can recover 65% of its mechanical properties after hot pressing at 180°C, achieving self-healing and recyclability.
Smart Images
Figure CN119350584B_ABST