The development of chemically recyclable polymers serves as a promising strategy to solve the plastic pollution issue. In this contribution, we prepared a seven-membered cyclic carbonate with a cis-fused cyclohexane structure (C6DO). Ring-opening polymerization of this monomer afforded the aliphatic polycarbonate P(C6DO) with high molecular weight and narrow polydispersity. Copolymerization of C6DO with L-lactide (L-LA) allowed access to a series of random copolymers with various C6DO compositions. Changing the C6DO content in the copolymers led to fine-tuning of the thermal and mechanical properties of the resulting copolymers. The amorphous P(C6DO) displayed excellent ductility, with an elongation at break of 423.41 ± 39.22%. Remarkably, copolymer P[(C6DO)₈₀₀-co-(L-LA)₂₀₀] demonstrated a tensile strength at break of 10.88 ± 1.08 MPa and elongation at break of 336.78 ± 46.13%. More importantly, P(C6DO) could be effectively and selectively depolymerized into the corresponding monomer C6DO, establishing a circular plastic economy.

中文翻译：

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顺式稠合环己烷促进聚碳酸酯化学回收为单体

开发化学可回收聚合物是解决塑料污染问题的一个有前景的策略。在本论文中，我们制备了具有顺式稠合环己烷结构（C6DO）的七元环状碳酸酯。该单体的开环聚合提供了具有高分子量和窄多分散性的脂肪族聚碳酸酯P(C6DO)。 C6DO 与L-丙交酯 ( L -LA)的共聚可以得到一系列具有各种 C6DO 组成的无规共聚物。改变共聚物中的 C6DO 含量可以微调所得共聚物的热性能和机械性能。无定形P(C6DO)表现出优异的延展性，断裂伸长率为423.41±39.22%。值得注意的是，共聚物P[(C6DO) ₈₀₀ - co -( L -LA) ₂₀₀ ]的断裂拉伸强度为10.88 ± 1.08 MPa，断裂伸长率为336.78 ± 46.13%。更重要的是，P(C6DO)可以有效地、选择性地解聚成相应的单体C6DO，建立循环塑料经济。