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Polyunsaturated Hydrocarbon Polymers via RingOpening Insertion Metathesis Polymerization(ROIMP)
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Researchers developed polyunsaturated hydrocarbon polymers via ring-opening insertion metathesis polymerization (ROIMP), creating a new class of chemically recyclable plastics designed to address the persistent environmental burden of conventional non-degradable synthetic polymers.
The replacement of persistent plastics with chemically recyclable and environmentally benign alternatives has become an urgent issue for our society. Although an increasing number of degradable polymers are available, many of them are facing with common challenges, that do not always allow for efficient direct replacements for durable plastics such as polyethylene. In this work, we present a new methodology for synthesizing cleavable units containing elastomers and thermoplastics by Ring-Opening Insertion Metathesis Polymerization (ROIMP) of cyclopentene (CP) with unsaturated polyester and polycarbonate oligomers. In the first step, diallyl ester oligomers were synthesized through acyclic diene metathesis (ADMET) polymerization, cyclopentene was then co-polymerized with the oligomers via ROIMP giving longchain polypentenamer (PP) dyads separated by easily cleavable singular ester or carbonate functionalities. Hydrolysis of the formed cleavable PP elastomer resulted in the formation of low molecular weight telechelic, OH-end-functionalized PP oligomers. Hydrogenation of the synthesized elastomers using Wilkinson's catalyst produced saturated long-chain hydrocarbon polymers with randomly distributed, cleavable subunits.
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Synthesis of Cleavable Saturated and Polyunsaturated Hydrocarbon Polymers via RingOpening Insertion Metathesis Polymerization(ROIMP)
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Researchers developed a new polymerization method called Ring-Opening Insertion Metathesis Polymerization (ROIMP) to synthesize hydrocarbon elastomers and thermoplastics containing built-in cleavable ester or carbonate units, enabling chemical recyclability through hydrolysis into low-molecular-weight oligomers as a sustainable alternative to conventional persistent plastics.
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Researchers developed chemically recyclable polyoxazolidinones (POxa) -- polymers with five-membered urethanes in their backbone -- via ring opening metathesis polymerization, achieving high molar mass materials with tunable properties. The approach demonstrates a viable route to next-generation recyclable polymers as alternatives to conventional non-recyclable urethane-based materials.
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