Abstract: With butadiene (Bd) and styrene (St) as monomers, n-butyllithium (n-LiBu) as initiator, cyclohexane as solvent, ditetrahydrofurfurylpropane (DTHFP) as structure modifier, four tin chloride (SnCl4) was used as the coupling agent, and the binary block solution polymerized styrene butadiene rubber (SSBR) was synthesized by living anionic polymerization technology. The mass ratio of the first block Bd/St (high Bd content, referred to as soft segment) was investigated, the influence of the second block Bd/St mass ratio (high bound St content, referred to as hard segment) and the diblock length ratio on the dynamic mechanical properties of SSBR. The results show that the two blocks with a large block length ratio are beneficial to broaden the effective damping temperature range. The mass ratio of Bd/St in the soft segment of the binary block SSBR has little effect on its dynamic mechanical properties, while the mass ratio of Bd/St in the hard segment has a greater impact on its dynamic mechanical properties. Moderate Bd/St mass ratio of hard segment and length ratio of two blocks have important influence on SSBR with high damping performance. In hard segment, Bd/St mass ratio is between 50/50 and 30/70, and the length ratio of two blocks is between 7/3 and 6/4. The dynamic mechanical curve changes from narrow single peak to wide single peak and double peak, and completely separated double peak. In this interval, Tg, tanδmax and effective damping temperature can be effectively adjusted.
王雷, 王文恒, 廖明义. 二元嵌段丁苯橡胶的合成及动态力学性能的研究[J]. 材料导报, 2023, 37(14): 21120152-5.
WANG Lei, WANG Wenheng, LIAO Mingyi. Study on the Synthesis and Dynamic Mechanical Properties of Binary Block Styrene-Butadiene Rubber. Materials Reports, 2023, 37(14): 21120152-5.
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2023, Vol. 37 
