白炭黑与溶聚丁苯橡胶的键接位置对白炭黑/炭黑/溶聚丁苯橡胶复合材料性能的影响

研究白炭黑/炭黑填充星形溶聚丁苯橡胶(SSBR)和分子链自由末端用硅氧烷基团封端改性星形SSBR(S-SSBR)的物理性能、动态力学性能和微观结构。结果表明:随着偶联剂用量(硅氧烷基团物质的量)的增大,星形SSBR复合材料的拉伸强度先增大后减小,S-SSBR复合材料的拉伸强度先减小后增大;星形SSBR和S-SSBR复合材料的300%定伸应力呈增大趋势,压缩疲劳温升降低,0℃下损耗因子(tanδ)增大,60℃下tanδ值减小。当复合材料中硅氧烷基团的物质的量相同时,与星形SSBR复合材料相比,S-SSBR复合材料定伸应力和0℃下tanδ值的增幅、压缩疲劳温升和60℃下tanδ值的降幅较大,填料的分散性较好。

Influence of Reaction Site Position between Silica and SSBR on Properties of Silica/Carbon Black/SSBR Composites

The physical property,dynamic property and microstructure of silica/carbon black filled star-shaped solution-polymerized styrene-butadiene rubber(SSBR) and modified SSBR(S-SSBR),in which the macromolecular chain ends were capped with siloxane terminal groups,were investigated.The results showed that,as the addition level of coupling agent(mole of siloxane group) increased,the tensile strength of SSBR composites increased at first and then decreased,and the tensile strength of S-SSBR composites decreased at first and then increased;the modulus at 300% elongation of both composites tended to increase,the temperature rise in compression fatigue test decreased,the tanδ value at 0 ℃ increased,and the tanδ value at 60 ℃ decreased.With same addition level of coupling agent,compared with SSBR composites,the modulus at 300% elongation and tanδ value at 0 ℃ of S-SSBR composites increased more,the compression fatigue temperature rise and tanδ value at 60 ℃ decreased more,and dispersion of fillers was better.