通过结合对称/不对称的链延长器,实现机械坚固,自我报告和可愈合的聚氨弹性体
Haitao Wu1, Hao Wang1, Mi Luo2
1State Key Laboratory of Polymer Materials Engineering, College of Polymer Science and Engineering, Sichuan University, Chengdu 610065, China. wujinrong@scu.edu.cn.
Materials horizons
|January 24, 2024
概括
这项研究开发了先进的聚氨弹性体,可以自我修复和报告损伤. 这些材料具有卓越的机械强度和性,克服了当前自我修复技术的局限性.
科学领域:
- 材料科学 材料科学 材料科学
- 聚合物化学 聚合物化学
背景情况:
- 自愈弹性体通常缺乏机械强度,环境稳定性和损坏报告能力.
- 现有的材料很难同时解决机械强度,化学耐药性和自我报告功能.
研究的目的:
- 设计和合成一种具有集成自我愈合,自我报告和机械强度的新型聚氨 (PU) 弹性体.
- 通过提高机械性能和环境稳定性来克服传统自愈材料的局限性.
主要方法:
- 利用对称和不对称的链延长剂的组合,特别是4-氨基二硫化物 (APDS) 和不对称的光2-(4-氨基) -5-氨基胺醇 (PABZ),在PU弹性体中创建大,无序的硬域.
- 链延长器的受控摩尔含量控制域结构,自由体积分数和应变诱导结晶 (SIC).
- 加入聚二甲基西洛为内在的疏水性.
主要成果:
- 实现了卓越的机械强度 (60.7 MPa) 和性 (177.9 MJ m−3).
- 由于网络放松动态,证明了高治愈效率 (97.8%).
- 开发了对刺激有反应的光,用于机械/化学损伤和愈合过程的自我报告.
- 展示了内在的疏水性和信息编码/加密的潜力.
结论:
- 开发的PU弹性体成功地整合了机械强度,自我愈合和自我报告能力.
- 创新的设计策略为创建具有增强性能的多功能材料提供了一条途径.
- 该材料在防伪,损坏指示和先进的保护性涂层方面的应用非常有前途.
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