一种可溶于非极性溶剂的双锂引发剂的合成及聚合性能  

Synthesis and polymerization performance of a kind of dilithium initiator soluble in non-polar solvent

作　　者：景梦娜 董静 张定军[1] JING Meng-na;DONG Jing;ZHANG Ding-jun(School of Materials Science and Engineering,Lanzhou University of Technology,Lanzhou 730050,China;Lanzhou Petrochemical Research Center,Petrochemical Research Institute,PetroChina,Lanzhou 730060,China)

机构地区：[1]兰州理工大学材料科学与工程学院,兰州730050 [2]中国石油石油化工研究院兰州化工研究中心,兰州730060

出　　处：《合成橡胶工业》2023年第6期545-545,共1页China Synthetic Rubber Industry

摘　　要：通过仲丁基锂和2,6-二甲基吡啶在环戊烷中反应1 h制备了一种新型的双锂引发剂,此引发剂可溶于非极性溶剂环戊烷,且相较于传统的单锂引发剂,当用于苯乙烯和丁二烯的溶液聚合时,此双锂引发剂的用量仅为单锂引发剂的一半,由该引发剂制备的丁苯橡胶的实测数均相对分子质量(M_(n))与设计的M_(n)基本相当,且得到产物的GPC曲线包含一较窄且对称的单峰,表明该双锂引发剂具有较高的引发活性。Dilithium initiators had sparked the interest of academic and industiral chemists alike recently.Compared with monolithium initiators,dilithium initiators provided a simple route to synthesize a vast array of homopolymer or copolymer while obtaining a controlled architecture with functional groups at both chain ends in one step.The existing dilithium initiators had some disadvantages:first of all,they had poor solubility in non-polar solvents,while the use of polar solvents during synthesis would limit their effectiveness in diene polymerization;secondly,they needed to react in toxic solvents such as toluene,etc.The procedure for preparing the dilithium initiator was as follows:2,6-dimethylpyridine(A),sec-butyl lithium(B)and tetrahydrofuran(C)with n(A)/n(B)/n(C)of 1/1.3/1 were successively added to 3 L polymerization kettle with cyclopentane,a non-polar solvent,as solvent and the reaction mixture was stirred at room temperature for 1 h to give the dilithium initiator,which was soluble in cyclopentane,a non-polar solvent;and then styrene and butadiene with m(styrene)/m(butadiene)of 1/3 were added to polymerization kettle in turn,and the polyme-rization lasted for 5 h at the temperature of 50-60℃;finally,the polymerization was terminated with anhydrous ethanol.

关 键 词：2 6-二甲基吡啶 丁苯橡胶 丁二烯 苯乙烯 双锂引发剂 非极性溶剂 

分 类 号：TQ314.241[化学工程—高聚物工业]