The liquid isoprene rubber (LIR) was synthesized with neodymium neodecanoate (Nd)/diisobutylaluminium hydride (Al)/diethylaluminum chloride (Cl)/isoprene (Ip) catalyst system.The microstructure of the polymer was characterized by FT-IR,1H-NMR and 13C-NMR spectroscopy.The results demonstrated that the chain transfer reaction in the polymerization was mainly determined by the dosage of Al in the catalyst.The average transfer number of active center was linearly related to the dosage of Al.The amount of Cl and Ip in the catalyst had little effect on the chain transfer reaction.Under the optimized catalyst preparation condition,when the catalyst dosage was as low as Nd/Ip=1.5×10-4,LIR with the same molecular weight as imported products can be synthesized.Only cis-1,4 structure and 3,4 structure can be found in the synthesized LIR.The content of cis-1,4 structure was higher than 97.5%.
Zhao Jiangwei, Tang Zhengwei, Zhang Jie, Xu Lin
. Synthesis and structural characterization of liquid isoprene rubber by Nd neodecanoate catalyst[J]. New Chemical Materials, 2021
, 49(9)
: 147
-150
.
DOI: 10.19817/j.cnki.issn 1006-3536.2021.09.032
[1] 贾志欣,杜明亮,郭宝春,等.液体聚异戊二烯的结构表征[J].合成材料老化与应用,2005,34(4):23-26.
[2] 杨达.新型橡胶增塑剂(液体橡胶)介绍——LIR(液体异戊二烯)[J].化工新型材料,2007,35(6):82.
[3] 任月庆,赵素合,李倩倩,等.反应性增塑剂液体聚异戊二烯橡胶对异戊橡胶性能的影响[J].橡胶工业,2014,61(2):89-94.
[4] 陈晓丽,苏忠魁,马松凯.结构调节剂对液体聚异戊二烯橡胶结构的影响[J].橡胶工业,2018,65(11):1257-1260.
[5] 李传清,贺小进.液体聚异戊二烯橡胶的研究进展[J].橡胶工业,2012,59(5):313-316.
[6] 唐正伟,梁汉东,张杰,等.磷酸酯钕催化剂合成高顺式液体聚丁二烯的研究[J].化工新型材料,2019,47(5):153-157.
[7] 贺小进,康新贺,刘辉,等.液体异戊二烯橡胶的合成及结构表征[J].弹性体,2011(2):36-39.
[8] 贺小进,陈宏,康新贺,等.液体聚异戊二烯橡胶在轮胎胎肩胶中的应用[J].橡胶工业,2013,60(1):33-38.
[9] Dai Q Q,WenJQ,Fan C L,et al.Synthesis of high cis-1,4-unit content liquid polyisoprene by bulk polymerization with Nd-based catalyst[J].China Synthetic Rubber Industry,2010,33(5):395-395.
[10] 赵姜维,李传清,张杰,等.钕系均相稀土催化剂、其制备方法及其应用:中国,CN102532354A[P].2012-07-04.
[11] Shen Z Q,Song X Y,Xiao S H,et al.Coordination copolymerization of butadiene and isoprene with rare-earth chloride-alcohol-aluminum trialkyl catalytic systems[J].Scientia Sinica Series B,1982,28(2):124-136.
[12] 李桂连,董为民,姜连升,等.均相Nd(vers)3／Al(i-Bu)2H／Al(i-Bu)2Cl催化聚合异戊二烯[J].合成橡胶工业,2006(3):181-185.
[13] 赵姜维,张杰,李传清,等.稀土异戊橡胶在载重胎胎面中的应用[J].轮胎工业,2015,35(2):93-96.
[14] Zhao J W,Zhu H,Wu Y X,et al.Effect of chain microstructure of butadiene-isoprene copolymers of their glass transition and crystallization[J].Chinese Journal of Polymer Science,2010,28(4):475-482.
