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使用其残留聚合催化剂再加工热聚氨泡

Subeen Kim¹, Lillian M Felsenthal¹, Oliver Sala²

¹Department of Chemistry, Northwestern University, 2045 Sheridan Road, Evanston, Illinois 60208, United States.

Journal of the American Chemical Society

|September 19, 2025

概括

这项研究展示了一种利用残留催化剂回收热聚氨 (PU) 泡废弃物的新方法. 这种方法避免添加新的催化剂,降低了与PU再加工相关的成本和环境问题.

科学领域:

聚合物化学
材料科学
可持续的化学

背景情况:

热聚氨 (PU) 泡回收通常需要添加新的催化剂,增加成本和潜在的环境危害.
在合成过程中PU泡中存在的残留催化剂可能具有碳酸盐交换活性,使其能够在没有附加剂的情况下进行再加工.

研究的目的:

调查使用剩余的三级胺催化剂的潜力,例如1,4-diazabicyclo[2.2.2]octane (DABCO),用于再处理热废物.
在PU回收相关的各种条件下评估DABCO在碳酸盐交换反应中的催化活性.

主要方法:

进行了模拟化合物研究和交叉实验,以评估DABCO在碳酸盐交换中的催化机制和活性.
在双螺杆挤出机中进行了商业热性PU泡的再加工,检查了剪切力和残留催化剂的影响.
再加工PU薄膜的特性包括热分析 (玻璃过渡温度) 和机械测试 (拉伸性质).

主要成果:

证实DABCO能够催化分离性和关联性碳酸盐交换,其活性受酒精度的影响.
与小分子研究相比,双螺杆挤出机中的微化合物由于高切削力而加速了键交换.
三种商用耐热PU泡成功再加工成保持原始热和机械性能的薄膜,并生产了可调节的复合材料.

结论:

像DABCO这样的剩余三级氨基催化剂可以有效地促进热固性PU废物的再加工,而不会改变商业配方.
这种方法为PU泡回收提供了成本效益和环保的方法,保护了材料的性能.
这些发现突出了通过利用固有的催化活性来实现PU产品可持续回收的潜力.

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