カ-ボンブラック複合SBR加硫物の体積弾性率の断続緩和現象

概要

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The measurements of repeated relaxation of the bulk modulus were carried out on vulcanized SBR samples with various composite values of carbon black, which were treated of changes of relaxation spectrum form.Consequently we inferred the following; (1) relaxation elements on every relaxation time recovered by the same process in case of compression. The recovery in natural rubber were nearly perfection. (2) in carbon black-filled vulcanizate systems that made heterogeneous structures, relaxation spectrum forms of bulk modulus in repeated relaxation were one by one astringent in relaxation spectrum of pure rubber on account of repeated compression.We inferred that change of these relaxation spectrum forms in repeated relaxation originated in increase of free volume of A phase because of the decrease of molecular chain′s interaction like change′s model of A and C phase by repeated compression (Fig. 1).
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