【摘要】 用自制的四氢糠基乙基醚(ETE)作为结构调节剂,正丁基锂作为引发剂,制备了高乙烯基含量的溶聚丁苯橡胶(SSBR)。在5L不锈钢反应釜内,详细研究了调节剂用量和引发温度对聚合反应的影响;用气相色谱(GC)、凝胶渗透色谱(GPC)和核磁共振仪(1H-NMR)分别测定了单体转化率、偶联反应效率和共聚物的微观结构。结果表明,改变调节剂的用量以及引发反应温度,可以控制SSBR分子链段中的乙烯基含量在10%～60%之间变化;50℃下,丁苯活性链与四氯化锡的偶联效率始终保持在60%以上。对所得SSBR的相关性能测试表明,聚合物具有良好的物理性能、加工性能及突出的抗湿滑性能。有望应用于雨胎和赛车胎用胶。更多还原

【Abstract】 The ethyl tetrahydrofury ether(ETE) was used as a novel structural modifier for the preparation of solution styrene and butadiene rubber(SSBR).In a 5 L reactor,the high-vinyl SSBR was synthesized by anionic solution copolymerization of styrene and butadiene with n-butyllithium(n-BuLi) as initiator and cyclohexane and n-hexane as mixed solvent.The effects of modifier dosage and polymerization temperature on the kinetics of copolymerization and microstructure of the copolymers were investigated in detail.The conversion of monomers,coupling efficiency and microstructure of the copolymers were analyzed by gas chromatograph(GC),gel permeation chromatograph(GPC) and nuclear magnetic resonance(1H-NMR),respectively.It was found that the copolymerization rate increases with increasing the modifier adding amount,and the 1,2-units of polybutadiene in SSBR could be controlled in the range of 10% to 60% by altering the modifier adding amount or the initiation temperature.At 50℃ and using tin tetrachloride(SnCl4) as coupling agent,the coupling efficiency could be maintained at more than 60%.The synthesized SSBR possesses good physical and mechanical properties and excellent wet skidding-resistance performance,and thus the synthetic product is a potential matrix for race tire treads and rain tire treads.更多还原