Sakae Inoue

Studies on oil distribution in polymer blends

Oils and resins are widely used in rubber industries to improve or control the mechanical properties, viscoelastic behavior, processability, and tackiness of a rubber compound. Very few fundamental studies have been reported on the function and the mechanism of oils and resins in a rubber mixture. In this article oil or resin distribution to each phase in an immiscible binary elastomer blend was studied by measuring the change of thermodynamical parameters, such as glass transition temperature, melting point of crystallines, and heat at melt of each polymer component. Several independent approaches give consistent results. It was found that aromatic oil was favorably distributed to the polystyrene-butadiene (SBR) phase of an SBR/natural rubber (NR) blend. Similarly, unequal distribution of resin in a blend was observed for a natural resin (rosin) and a petroleum resin.

Analysis of Crosslinking Structure by Compressive Property of the Swollen Rubber(Part 3).

本報では第一報, 二報で報告した架橋構造解析法の基礎となった, スルフィド結合の選択的切断の吟味を行った. 実験はモデル化合物を用い, ガスクロマトグラフ法により行った. その結果,(1) 一級チオールはポリ, ジ, 両スルフィド結合を迅速に切断し, 水素化アルミニウムリチウムによる切断と一致する.(2) 二級チオールはポリスルフィド結合を切断するが, ジスルフィドとの反応は1/200程度と緩やか.(3) 一級チオールは炭素-炭素結合は切断しない.(4) チオールによるスルフィド結合の切断反応は酸素を除去した系で行う必要がある. 等が確かめられた.