الملخص

Abstract Recovery behaviors from circular deformation of styrene butadiene rubber were studied at different aging circumstances. SBR1502, VLS2525, NS116, were the material used to make different types of SBR. Circular deformation was done on all samples at different periods and temperatures. Recovery percent was measured and found that it was increased with deformation time and decreased with aging temperature increment and it was the highest for NS116 and the lowest for SBR1502. Also the apparent crosslink density was measured and found that it was increased with aging temperature for the three types rubber and the rate of its variation was the highest for SBR1502 and the lowest for NS116.