Aromatic polycarbonates are attractive, high-performance thermoplastic materials. However, it is still a formidable challenge to achieve economical and promising chemical recycling of aromatic polycarbonates. Herein, we prepared two benzo-fused seven-membered cyclic thiocarbonate monomers (M1 and M2) with different sulfur atoms to construct chemically recyclable aromatic poly(thio)carbonates. These monomers underwent efficient DBU-catalyzed polymerization even with a catalyst loading of 0.01 mol %. The resulting aromatic poly(thio)carbonate P(M1) was a semicrystalline material with a Tm of 131 °C, while P(M2) was amorphous with a Tg of 48 °C. In comparison with the commercial aromatic polycarbonates, they showcased enhanced refractive index (nD = 1.64/1.71), manifesting the benefit of sulfur incorporation into the polymer material. Degradation of the poly(monothio)carbonate led to a mixture of monomer and decarboxylation product. Impressively, P(M2) illustrated efficient SnCl2-mediated depolymerization via bulk thermal depolymerization, recovering M2 with quantitative yields (>95%).
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Jia-Rong Yao
Jian Zhang
Kun Li
ACS Macro Letters
Sichuan University
Ingenierie des Materiaux polymeres
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Yao et al. (Fri,) studied this question.
www.synapsesocial.com/papers/69bf8692f665edcd009e8eb7 — DOI: https://doi.org/10.1021/acsmacrolett.6c00094