可回收的米拉可回收聚氨基基以纳米键为基础,具有上循环的机械性能
Xinyu Li1, Nanying Ning1,2,3, Bing Yu1,2,3
1State Key Laboratory of Organic-Inorganic Composites, Beijing University of Chemical Technology, Beijing, 100029, China.
Macromolecular rapid communications
|January 13, 2025
概括
研究人员使用动态键开发了一种可回收的聚氨. 这种新型材料在经过多次无溶剂回收循环后保持甚至提高机械强度,为高性能聚合物提供可持续的解决方案.
科学领域:
- 聚合物科学 聚合物科学
- 材料科学 材料科学 材料科学
背景情况:
- 热塑性聚氨 (TPU) 是可再加工的,但在再加工过程中会降解.
- 耐热聚氨具有优良的机械性能,但由于永久交叉连接,不能回收利用.
- 在聚氨中实现可回收性和机械性能之间的平衡仍然是一个重大挑战.
研究的目的:
- 开发一种具有可调整机械性能的新型可回收聚氨 (PU).
- 引入一个新的动态债券系统,用于创建可重加工和可重交联的PU.
- 展示一种无溶剂回收方法,以提高材料性能.
主要方法:
- 合成了一种新的可回收加工的可磨粉聚氨,使用由氨和异酸盐反应形成的动态键.
- 使用氨基添加来触发交叉连接位点的解离,将网络转换为线性聚合物.
- 在没有溶剂的Haake混合器中,重新将线性聚合物与异酸盐交叉连接在一起,以创建新的PU.
- 研究了氨基和异酸盐含量对机械性能和可回收性的影响.
主要成果:
- 开发的聚氨表现出可重加工性和可调节的网络形态.
- 为PU回收利用,建立了一种无溶剂的一步融方法.
- 经过多次回收循环后,机械性能,包括拉力强度,得到了提高 (在四个循环后增加了178.4%).
- 该材料在回收后证明了机械增强.
结论:
- 一个新的动态键使得可回收聚氨具有出色的机械性能的创建.
- 无溶剂回收工艺为PU提供了一种可行和可持续的方法.
- 这种方法允许在回收时进行可定制性质和机械增强,解决了聚合物可持续性的关键挑战.
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