EPDM加硫物のイオウ結合形態の分析

概要

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Various EPDM vulcanizates having different chemical structures of crosslinking point such as C-C linkage, C-R-C linkage, C-Sx-C linkage were prepared by using various curing systems.<BR>C-Sx-C linkage was separated into poly-sulfide linkage and mono-sulfide linkage by LiAlHJ method which was confirmed previously by using the model materials.<BR>The relationships between the chemical structure of combined sulfur in crosslinking point and kinds of curing agents were clarified. For example, the mole ratios of poly-sulfide linkage to all the combined sulfurs in the vulcanizates by using various curing systems such as DCP-Sx cure, TT cure, Sx-TT cure and Sx-PZ cure 0.45, 0.25, 0.35 and 0.82, at 160 °C for 45 minutes. But C-C linkage addition to the C-Sx-C linkage was contained in DCP-Sx cure.