无规溶聚苯乙烯/丁二烯橡胶的负离子法合成、微观结构和性能

材料导报

2021, Vol. 35

Issue (z2): 465-469

高分子与聚合物基复合材料

无规溶聚苯乙烯/丁二烯橡胶的负离子法合成、微观结构和性能

廖明义¹, 王文恒¹, 王旭¹, 张春庆²

1 大连海事大学交通运输工程学院,大连 116026
2 大连理工大学化工学院,大连 116024

Anionic Synthesis and Structure and Properties of Random Solution-polymerized Styrene/butadiene Rubber

LIAO Mingyi¹, WANG Wenheng¹, WANG Xu¹, ZHANG Chunqing²

1 Transportation Engineering College, Dalian Maritime University, Dalian 116026,China
2 School of Chemical Engineering, Dalian University of Technology, Dalian 116024,China

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摘要以苯乙烯(St)和丁二烯(Bd)为单体、正丁基锂为引发剂、环己烷为溶剂、双四氢糠丙烷(DTHFP)为调节剂、四氯化锡(SnCl₄)为偶联剂,采用活性负离子溶液聚合技术合成了苯乙烯/丁二烯橡胶(SSBR),考察了St/Bd质量比和1,2-结构单元含量等因素对其结构和性能的影响。采用核磁共振氢谱(¹H-NMR)、凝胶渗透色谱(GPC) 、动态力学分析仪(DMA)和万能材料测试仪分别表征了SSBR的微观结构和分子量、分子量分布、玻璃化转变温度(T_g)、动态力学性能和力学性能。结果表明,SSBR结构呈无规分布,1,2-结构单元含量可以精确调控。随着St/Bd质量比的增加,SSBR硫化胶的邵尔硬度、拉伸强度和100%定伸应力增加,断裂伸长率下降。随着1,2-结构单元含量的增加,SSBR硫化胶的拉伸强度和断裂伸长率呈下降趋势,邵尔硬度和100%定伸应力变化不大。随着St/Bd质量比和1,2-结构单元含量的增加,硫化胶的DMA曲线均向高温方向移动,T_g增加,tanδ_max呈现出先增大后减小的趋势。其阻尼温域随St/Bd质量比的增加而增加,但随1,2-结构单元含量的变化较小。

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关键词: SSBR 负离子聚合微观结构力学性能阻尼性能

Abstract: Solution-polymerized styrene/butadiene rubber (SSBR) has been synthesized by using styrene and butadiene as monomers, n-BuLi as initiator, cyclohexane as solvent and ditetrahydrofuran propane (DTHFP) as structure modifier via anionic living polymerization.The effects of St/Bd mass ratio and 1, 2-unit content on structure and properties were investigated. The microstructures, the molecular weight and molecular weight distribution, T_g, dynamic mechanical properties and mechanical properties of SSBR were characterized by¹H nuclear magnetic resonance (¹H-NMR), gel permeation chromatography (GPC), dynamic mechanic analysis (DMA) and universal material tester, respectively. The results showed that the SSBR structure was the random distribution, the content of 1,2-unit could be precisely controlled. The shore A hardness, tensile strength and stress at 100% of the vulcanized SSBR increased and the elongation at break decreased with increasing the St/Bd mass ratio. The tensile strength and elongation at break of the vulcanized SSBR decreased, and the Shore A hardness and stress at 100% did not change much with increasing the content of 1,2-unit. The DMA curves of the vulcanized SSBR gradually moved towards high temperature area, T_g increased, tanδ_max first increased and then decreased with increasing the St/Bd mass ratio and the content of 1,2-unit. The damping temperature range increased with increasing the St/Bd mass ratio, but had little change with increasing the content of 1,2-unit.

Key words: SSBR anionic polymerization microstructures mechanical property damping property

发布日期: 2021-12-09

ZTFLH:

TQ333.99

通讯作者: liaomy@dlmu.edu.com

作者简介: 廖明义,大连海事大学教授,博士研究生导师。1984年本科毕业于大连工学院化工系,1988—1993年公派到俄罗斯莫斯科精细化工学院攻读博士学位。主要研究方向为通用橡胶合成、液体氟橡胶制备和应用、聚合物基纳米复合材料。

引用本文:

廖明义, 王文恒, 王旭, 张春庆. 无规溶聚苯乙烯/丁二烯橡胶的负离子法合成、微观结构和性能[J]. 材料导报, 2021, 35(z2): 465-469.
LIAO Mingyi, WANG Wenheng, WANG Xu, ZHANG Chunqing. Anionic Synthesis and Structure and Properties of Random Solution-polymerized Styrene/butadiene Rubber. Materials Reports, 2021, 35(z2): 465-469.

链接本文:

http://www.mater-rep.com/CN/ 或 http://www.mater-rep.com/CN/Y2021/V35/Iz2/465

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