充てん剤系未加硫ゴムの分子運動の研究

概要

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It has been recognized that filler loaded rubber systems are not simple mixtures of fillers being dispersed in rubber matrix but there exist complex heterogeneity in the system.In this paper, molecular motion of rubber molecules in filler loaded unvulcanized natural rubber has been investigated by nuclear magnetic resonance (NMR), dynamic mechanical measurements and differential scanning calorimetry (DSC) for various species (ISAF, CaCO3, SiO2) and varying filler content (0.0-0.35) to analyze and quantitize the complex heterogeneity in the system and to study the relationship between molecular motion and macroscopic mechanical behavior of filler loaded rubber systems. From those experiments, it has been deduced that molecular motion of rubber molecules which is apart from filler surface (A-phase) is restricted when they are in active motion according to surface activity and dispersion state of fillers and the mechanical character of filler loaded unvulcanized natural rubber such as dynamic modulus E′ and mechanical loss factor tanδ can be expressed by the quantity which is measured by NMR transforming the restricted motion to apparent volume content of unmotional rubber molecules.
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