抄録
In the previous paper we compared the mechanical and optical measurement data with the theory concerned with filled vulcanized rubber. Since, in higher concentrated specimens, the isochromatic lines were not clear and moreover the transparency was poor, the optical data could not be analysed in the foregoing study.
In this paper, more transparent specimens have been used and Sato's new theory (which is shown in this issue) based on the more accurate internal deformation is made use of and examined.
The specimens used here are: MgCO3-NR (X=0, 0.052, 0.103, 0.210, 0.318, and 0.415), SiO2-NR and SiO2-SBR (in the latter two X=0, 0.05, 0.1, 0.15, 0.2, 0.25, 0.3, and 0.35), where X is the volume ratio of filler to rubber.
The tension σ and the strain birefringence Δn were measured simultaneously, and the apparatus used and the conditions were the same as those in the previous report.
According to the analysis of both data of σ and Δn by means of Sato's theory, the degree of adhesion (1-ζ) decreases from the second time of loading, and also the decrease tends to be saturated in repeated elongations. Since the values of measurement of Δn for the specimens containing SiO2 do not always bear out the theory, we are going to make more accurate and detailed measurement and analysis in future.
