天然ゴム加硫物の熱酸化に及ぼす架橋形態の影響〔ゴムの熱酸化に関する研究-1-〕

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The effect of the accelerator type, ratio of accelerator to sulfur, and sum of accelerator and sulfur on thermal oxidation of NR gum vulcanizates were investigated by the oxygen absorption measurements, chemical stress relaxation methods, and chemical analysis of the combined sulfur. It was found that the rate of oxidation of the vulcanizates was DPG>MBTS>OBS. It was made clear that good resistance for thermal oxidation of vulcanizates depends on the optimum levels of the ratio of accelerator to sulfur, and total contents of accelerator and sulfur.That is to say, this is due to the fact that an optimum proportion exists among the crosslink structures such as monosulfide, disulfide and polysulfide combined in the main chains of NR vulcanizates and good resistance against thermal oxidation is shown by the optimum proportion among the crosslink structures.