充てん剤加硫ゴムの熱刺激による構造変化と力学的刺激との類似性

概要

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Direction of structural changes of carbon black filled natural rubber vulcanizates due to thermal aging which is conducted in a closed system and with less influence from oxygen diffusion from surface of the sample has been analyzed by sulfur analysis, NMR measurements, X-ray diffraction method, swelling experiments, mechanical characteristics, fracture characteristis and the morphology of the fracture surfaces for various carbon blacks which differ in their degree of reinforcement. On the other hand, the direction of the structural changes of filled rubber vulcanizates due to thermal aging has been compared with that of them due to mechanical stimuli.<BR>It has been concluded that the unstable state of the chemical bonds and the physical (secondary) bonds in the filled rubber vulcanizates forming heterogeneous structures change to more stable state both due to thermal and mechanical stimuli and the degree of the change increases with the height of the heterogeneity of the system. It has also been proposed that the concept of the structural changes of the heterogeneous systems can be applied to either the process of mixing fillers and rubber and that of vulcanization and the structure of the filled rubber systems change always to be same direction.
日本ゴム協会の論文