2，2-二(5-甲基-2-四氢呋喃基)丙烷在丁二烯-苯乙烯阴离子聚合中的结构调节能力

The structure regulating ability of 2,2-bis (5-methyl-2-tetrahydrofuranyl) propane in anionic polymerization of butadiene-styrene

摘要:

本研究以正丁基锂 (n-BuLi)为引发剂，2，2-二(5-甲基-2-四氢呋喃基)丙烷 (BMTFP)、乙基四氢糠基醚 (ETE)、双四氢糠丙烷 (DTHFP)为极性调节剂，在不同调节剂用量及聚合温度下进行丁二烯-苯乙烯的阴离子共聚合反应。利用1H-NMR和GPC对丁苯共聚物的微观结构、相对分子量及其分布进行分析表征。实验结果表明，BMTFP 聚合体系中无副反应发生，共聚物分子量分布较窄，符合活性阴离子聚合的特点；BMTFP 对丁苯共聚物具有较强的微观结构调节能力，在聚合温度为50 ℃，BMTFP/n-BuLi (摩尔比) 为2/1时，丁苯共聚物中1,2-结构含量可以达到69.7 %，苯乙烯微嵌段含量趋近于0。且在相同条件下，BMTFP 与 ETE、DTHFP 对丁苯共聚物微观结构的调节能力处于同一水平，但 BMTFP 的合成中所需的主要原料来源于生物基平台化合物，从环境保护、能源安全以及潜在的经济价值等方面考虑，BMTFP 在制备高乙烯基溶聚丁苯橡胶方面具有良好的发展前景。

Abstract:

In this paper, anionic copolymerization of butadiene and styrene with n-butyllithium (n-BuLi) as initiator and 2, 2-bis (5-methyl-2-tetrahydrofuranyl) propane (BMTFP), ethyl tetrahydrofurfuryl ether (ETE) and ditetrahydrofuranyl propane (DTHFP) as polar regulators was carried out under different dosage of regulator and polymerization temperatures. The microstructure, molecular weight and its distribution of styrene-butadiene copolymer were characterized by 1H-NMR and GPC. The results showed that there was no side reaction in BMTFP polymerization system and the molecular weight distribution of copolymer was narrow, which was consistent with the characteristics of living? anionic polymerization. BMTFP has a strong ability to regulate the microstructure of styrene-butadiene copolymer. When the polymerization temperature was 50℃ and the BMTFP/ n-BuLi (mole ratio) was 2/1, the content of 1,2- structure in styrene-butadiene copolymer can reach 69.7%, and the content of styrene microblock tends to 0. Under the same experimental condition, BMTFP, ETE and DTHFP were at the same level in terms of their ability to regulate the microstructure of styrene butadiene copolymers. However, the raw materials required for BMTFP synthesis were bio-based platform compounds. From the aspects of environmental protection, energy security and potential economic value, BMTFP has a broad development prospect in the preparation of solution styrene butadiene rubber with high vinyl content.