SBR〜低分子物質混合加硫物系の力学特性

概要

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Dynamic mechanical properties and failure characteristics of vulcanized SBR-low molecular weight substance mixtures which can be regarded as compatible systems are examined in the glassy, transition and rubbery region with varying volume content and varying softening point of the several low molecular weight substances. <BR>Measured value of the mechanical properties is compared with the calculated value which is obtained by assuming the system to be homogeneous. In the calculation the variation in the degree of molecular motion of the system, the decrease in rubber fraction and the change in the crosslink density are considered. <BR>Good agreement with the calculated and measured value is obtained in the glassy and transition region of the system but there is considerable discrepancy between them in the rubbery region. <BR>It is infered to explain the discrepancy that there is phase seperation in the molecular order or there is developed a microheterogeneous structure according to the difference in the glass transition temperature between SBR and the low molecular weight substance. It is suggested that if the latter has a higher glass transition temperature than SBR, it has reinforcing effect and if the reverse is the case, it has diluting or weakening effect.
日本ゴム協会の論文