ผลของระบบวัลคาไนซ์และสารตัวเติมต่อสมบัติทางกายภาพของยางธรรมชาติอิพอกซิไดซ์ / จิราพรรณ ภาระบุญ = Effects of vulcanization systems and fillers on physical properties of epoxidized natural rubber / Jirapun Paraboon
This research investigated the effects of 3 fillers: carbon black, silica and calcium carbonate on physical properties of epoxidized natural rubber (ENR). The ENRs were prepared from high ammonia concentrated natural rubber latex via ‘in situ’ epoxidation method with various ratio of hydrogen peroxide and formic acid in the presence of a surfactant at 50℃ for 4h. The physical properties of unfilled-ENR and unfilled natural rubber (STR XL) which vulcanized by CV, semi-EV and EV system were examined. It was found that unfilled-ENR vulcanizate for all vulcanized systems. ENR filled with 50 phu of carbon black, silica and calcium carbonate were prepared and vulcanized by CV system for physical testing. It was found that carbon black-filled ENR showed higher physical properties: tensile strength, modulus, tear strength, hardness, compression set, abrasion resistance and oil resistance than those filled with silica and calcium carbonate. In addition, filled-ENRs showed superior physical properties than filled-STR XL.