热塑性多尿素具有优良的机械性能,由基于CO2的橄尿素合成
Hui Li1,2,3, Haiyang Cheng1,2,3, Fengyu Zhao1,2,3
1State Key Laboratory of Electroanalytical Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, No. 5625 Renmin Rd., Changchun, 130022, China.
Macromolecular rapid communications
|April 30, 2025
概括
本研究探讨了异酸盐指数 (R指数) 对热塑性多尿素 (PUas) 的影响. 将R指数优化为1.05,可以获得具有优越机械强度,热稳定性和再加工能力的PU.
科学领域:
- 聚合物化学 聚合物化学
- 材料科学 材料科学 材料科学
背景情况:
- 聚尿素 (PUas) 是广泛使用的聚合物,但传统的热固体形式缺乏可回收性.
- 异酸盐指数 (R指数) 对多尿素特性的影响尚不清楚.
- 开发可回收和高性能聚尿素对于更广泛的工业应用至关重要.
研究的目的:
- 研究不同R指数对热塑性多尿素 (PUas) 的合成和特性的影响.
- 为了确定一个最佳的R指数,以提高机械,热和再加工特性.
- 推进可持续和多功能聚尿素材料的开发.
主要方法:
- 合成的热塑性聚尿素 (PUas) 使用基于二氧化碳的橄尿素 (OUa) 和4,4'-二甲二酸盐 (MDI).
- 在不同合成批次 (R=1,1.05,1.11) 中改变了R指数 (异酸盐与氨基/基组的摩尔比率).
- 以机械性能 (抗拉强度,扬模量,性),热稳定性和再加工性来表征得到的PU.
主要成果:
- R指数显著影响PUa的分子量,结构,机械性能和热稳定性.
- 以1.05的R指数合成的PUa (PUa-1.05) 显示了最佳的性能.
- PUa-1.05实现了高抗拉强度 (≈75 MPa),模量 (≈1100 MPa) 和性 (≈104 MJ·m-3),以及出色的再加工能力.
- 所有合成的PUAs都表现出高热稳定性,分解温度高于312°C.
结论:
- R指数是量身定制热塑性多尿素特性的一个关键参数.
- 一个R指数为1.05提供了一个最佳的平衡的机械强度,性,热稳定性,并在PUas.再加工能力.
- 这项研究为开发用于各种工业应用的先进可回收聚氨提供了一条途径.
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