Zhao Liang, Semetey Vincent
Chimie ParisTech, PSL University, CNRS, Institut de Recherche de Chimie Paris, 11 Rue Pierre et Marie Curie, 75005 Paris, France.
ACS Omega. 2021 Feb 3;6(6):4175-4183. doi: 10.1021/acsomega.0c04855. eCollection 2021 Feb 16.
In this paper, we describe a new strategy to recycle polyurethanes (PUs) using base-catalyzed transcarbamoylation. PUs were depolymerized qualitatively in the presence of MeOH (methanol)/tetrahydrofuran as a solvent and -butoxide as a base catalyst. The resulting depolymerized mixture constituted by -dimethylcarbamates and polyols can either be used as the starting material to synthesize new PUs with the transcarbamoylation approach or be purified to recover polyols and diisocyanates. The versatility and easy scaling-up of the experimental procedures and high depolymerization outcomes of the presented method make this strategy very attractive for PU recycling.
在本文中，我们描述了一种利用碱催化转氨甲酰化作用回收聚氨酯（PU）的新策略。在甲醇/四氢呋喃作为溶剂以及叔丁醇盐作为碱催化剂的存在下，对聚氨酯进行定性解聚。由叔丁基二甲基氨基甲酸盐和多元醇组成的所得解聚混合物既可以用作通过转氨甲酰化方法合成新聚氨酯的起始原料，也可以进行纯化以回收多元醇和二异氰酸酯。所提出方法的实验步骤具有通用性且易于扩大规模，以及高解聚产率，使得该策略对聚氨酯回收非常有吸引力。
