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Updated: Sep 19, 2025

Depolymerizable Olefinic Polymers Based on Fused-Ring Cyclooctene Monomers
Published on: December 16, 2022
Enhanced recyclability of methacrylic resins by copolymerization or pendant modification using trityl esters
Yota Chiba1, Shoji Hirabayashi1, Yasuhiro Kohsaka1,2
1Faculty of Textile Science and Technology, Shinshu University 3-15-1 Tokida Ueda Nagano 386-8567 Japan kohsaka@shinshu-u.ac.jp.
None:
The conversion of pendant groups into poly(methyl methacrylate) (PMMA) to triphenylmethyl (trityl) esters facilitates thermal depolymerization, enabling the recovery of the monomer, methyl methacrylate (MMA). While PMMA offers potential for chemical recycling through depolymerization, its complete degradation necessitates extreme heating conditions exceeding 400 °C. Conversely, a copolymer consisting of MMA (95 mol%) and trityl methacrylate (TMA; 5 mol%), synthesized via free radical copolymerization, undergoes depolymerization at 270 °C, yielding pure MMA with 94.5% efficiency. Additionally, commercially available PMMA sheets and modified acrylic resins incorporating n-butyl acrylate as a comonomer were also successfully depolymerized at 270 °C through pendant conversion to trityl esters, achieving high yields of pure MMA.
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