星形支化溴化丁基橡胶的微观结构表征与应用性能研究

Study on Microstructure Characterization and Application Properties of Star-branched BIIR

研究星形支化溴化丁基橡胶(BIIR)S-2029的微观结构与应用性能,并与常规门尼粘度BIIR2828、高门尼粘度BIIR2249、中门尼粘度BIIR2841进行对比。结果表明:4种牌号BIIR的溴质量分数无明显区别,BIIR2249,BIIR2841,BIIR2828和BIIR S-2029混炼胶的门尼粘度和门尼应力松弛面积依次减小,其中BIIR S-2029混炼胶的门尼粘度和门尼应力松弛面积最小,加工性能最好;在10~1000 s^(-1)剪切速率范围内,BIIR S-2029混炼胶具有最小的挤出胀大比和收缩率,成型工艺性能最优;4种牌号BIIR混炼胶的硫化特性差异不大;受生胶相对分子质量的影响,BIIR2841和BIIR2249硫化胶的300%定伸应力和拉伸强度略高于其他2种牌号BIIR硫化胶,4种牌号BIIR硫化胶的弹性、耐屈挠性能和气密性无明显差异。

The microstructure and application properties of star-branched brominated butyl rubber(BIIR)S-2029 were studied and compared with conventional Mooney viscosity BIIR2828,high Mooney viscosity BIIR2249 and middle Mooney viscosity BIIR2841.The results showed that,there was no significant difference in the bromine content among the four brands of BIIRs.The Mooney viscosity and Mooney stress relaxation area of BIIR2249,BIIR2841,BIIR2828 and BIIR S-2029 compounds decreased in turn.BIIR S-2029 compound had the smallest Mooney viscosity and Mooney stress relaxation area,so it had the best processing properties.In the shear rate range of 10~1000 s^(-1),BIIR S-2029 compound had the smallest extrusion swell ratio and shrinkage rate,and its molding process performance was the best.The curing characteristics of the four brands of BIIR compounds had little difference.Affected by the molecular weight of raw rubber,the modulus at 300%elongation and tensile strength of BIIR2841 and BIIR2249 vulcanizates were slightly higher than those of other two brands of BIIR vulcanizates,and there was no significant difference in elasticity,flexure resistance and air tightness among the four brands of BIIR vulcanizates.