Study on vulcanization without zinc - Material science for future

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A development on a vulcanization method without zinc oxide is necessary to construct our sustainable society in future. A few kinds of metal oxide were investigated as vulcanization catalysis in this study. Unfortunately, however, no metal oxide with safety and richness as resource on the Earth was found to be alternative for zinc oxide. The sulfur cross-linking reaction of rubber by other reagents except metal oxides must be developed as soon as possible.