biostudies-literatureUnknown14(50)Hayano SHerein, we report a study on the preparation, properties, and depolymerization of pristine and vulcanized poly(cyclopentene) (poly(CP)), poly(norbornene-<i>ran</i>-cyclopentene) (poly(NB-<i>ran</i>-CP)) and poly(<i>endo</i>-dicyclopentadiene-<i>ran</i>-cyclopentene) (poly (DCP-<i>ran</i>-CP)). First, poly(CP), poly(NB-<i>ran</i>-CP) and poly(DCP-<i>ran</i>-CP) were prepared with high molecular weight control (<i>M</i> <sub>w</sub> = 200 000-500 000) using dichloro(3-phenyl-1<i>H</i>-inden-1-ylidene)bis(tricyclohexylphosphine)ruthenium(ii). Next, carbon black, zinc oxide and other additives were blended into the pristine polymers using a mixer and twin roll rubber mills at 50 °C, followed by vulcanization in metal molds at 160 °C for 10 min, resulting in molded black rubber specimens. CrossRSC advances37143-37154https://www.ebi.ac.uk/biostudies/studies/S-EPMC11577345biostudies-literatureDepolymerization of vulcanized poly(cyclopentene), poly(norbornene-<i>ran</i>-cyclopentene) and poly(<i>endo</i>-dicyclopentadiene-<i>ran</i>-cyclopentene) rubbers <i>via</i> ring-closing metathesis depolymerization for monomer recycling.PMC11577345Sakurai THayano SWang SIsobe KKumazawa KfalseDepolymerization of vulcanized poly(cyclopentene), poly(norbornene-<i>ran</i>-cyclopentene) and poly(<i>endo</i>-dicyclopentadiene-<i>ran</i>-cyclopentene) rubbers <i>via</i> ring-closing metathesis depolymerization for monomer recycling.Herein, we report a study on the preparation, properties, and depolymerization of pristine and vulcanized poly(cyclopentene) (poly(CP)), poly(norbornene-<i>ran</i>-cyclopentene) (poly(NB-<i>ran</i>-CP)) and poly(<i>endo</i>-dicyclopentadiene-<i>ran</i>-cyclopentene) (poly (DCP-<i>ran</i>-CP)). First, poly(CP), poly(NB-<i>ran</i>-CP) and poly(DCP-<i>ran</i>-CP) were prepared with high molecular weight control (<i>M</i> <sub>w</sub> = 200 000-500 000) using dichloro(3-phenyl-1<i>H</i>-inden-1-ylidene)bis(tricyclohexylphosphine)ruthenium(ii). Next, carbon black, zinc oxide and other additives were blended into the pristine polymers using a mixer and twin roll rubber mills at 50 °C, followed by vulcanization in metal molds at 160 °C for 10 min, resulting in molded black rubber specimens. Cross2024-01-01T00:00:00Z2024 Nov2025-04-26T01:52:38.525Z2025-04-06T10:17:15.896ZS-EPMC115773453956911510.1039/d4ra06914e