充てん剤が溶媒き裂成長に及ぼす影響

概要

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The solvent crack growth of rubber compounded with various carbon blacks or calcium carbonate was measured to investigate the influence of filler in rubber. It was found that the rate of crack growth of filler-loaded rubber was in a linear relation to extention ratio as well as NBR gum valcanizates described in the previous paper.<BR>The rate of crack growth passes through a minimum as the filler loading is increased and it is dependent on the particle size of the fillers; small particles show much greater effect than coarse ones. When the rates of crack growth of high loading samples were plotted against the extension ratio, characteristic plots consisting of two straight lines having a bending point were obtained.<BR>It was found that the extension ratio of this "bending point" depended upon the loading and particle size of filler and was in a linear relation to the root of distance between fillers.<BR>The slope of the line above the bending point varies with kinds of the filler; that of carbon black loading becomes sharp and that of calcium carbonate loading is dull in comparison with the line below the bending point.<BR>Discussion was made on both results with respect to the differnce of the surface activities.
日本ゴム協会の論文