不同微观构型低分子量聚异戊二烯的合成及性能  

Synthesis and Performance of Low Molecular Weight Polyisoprene with Different Microstructure

作　　者：严志轩 张孝娟 瞿金磊 高用亮 刘吉文 孙立水[1] 何丽霞 Zhixuan Yan;Xiaojuan Zhang;Jinlei Qu;Yongliang Gao;Jiwen Liu;Lishui Sun;Lixia He(Engineering Research Center for High Performance Polymers and Molding Technology Ministry of Education,Qingdao 266042,China;College of Polymer Science and Engineering,Qingdao University of Science and Technology,Qingdao 266042,China;Yellow River Delta JingBo Research Institute of Chemical Indusny Co Ltd,Binzhou 256500,China;An Army Representative Office,Qingdao 266042,China)

机构地区：[1]青岛科技大学高性能聚合物及成型技术教育部工程研究中心,山东青岛266042 [2]青岛科技大学高分子科学与工程学院,山东青岛266042 [3]黄河三角洲京博化工研究院有限公司山东滨州256500 [4]陆军某军代室,山东青岛266042

出　　处：《高分子材料科学与工程》2022年第9期16-22,共7页Polymer Materials Science & Engineering

基　　金：国家自然科学基金资助项目(51972185)。

摘　　要：采用阴离子聚合反应制备了不同微观构型的低分子量聚异戊二烯(LIR),研究了聚合反应温度、结构调节剂对聚异戊二烯微观构型的影响。应用红外光谱和核磁共振波谱分析产物结构,结果表明,反应温度越低、四氢呋喃(THF)用量越多,LIR分子链中3,4-结构含量越高,其中THF对聚异戊二烯微观构型的影响尤为显著。差示扫描量热分析和热重分析的结果表明,随着3,4-结构含量的提高,LIR的玻璃化转变温度和热分解温度随之升高。将上述LIR应用到炭黑补强的天然橡胶(NR)配方中,考察了LIR的微观构型对硫化胶性能的影响。结果表明,与芳烃油相比,填充LIR可改善硫化胶的拉伸性能和动态力学性能,其中高3,4-结构的LIR对改善复合材料的抗湿滑性能有利,高顺1,4-结构的LIR对改善复合材料的滚动阻力有利。Low molecular weight polyisoprene(LIR)with different microstructure were prepared by anionic polymerization and applied to natural rubber(NR)reinforced with carbon black.In order to explore the effect of polymerization reaction temperature and tetrahydrofuran(THF)on the microstructure of polyisoprene.The results of FT-IR and 1H-NMR show that the lower the reaction temperature and the more the THF content,the higher the content of 3,4-structure of polyisoprene.In particularly,THF has a significant effect on the microstructure of polyisoprene.The DSC and TGA analysis show that the glass transition temperature and thermal decomposition temperature of LIR increase with the increase of the 3,4 structure content of LIR.The LIR with different microstructure was applied to the formulation of natural rubber(NR)reinforced with carbon black.The influence of the microstructure of LIR on the properties of vulcanized rubber was compared.The results show that,compared with aromatic oils,LIR can improve the tensile properties and dynamic mechanical properties of vulcanizates,and LIR with high 3,4-structure is beneficial to improve the wet slip resistance of composites and LIR with high 1,4-structure is beneficial to improve the rolling resistance of composites.

关 键 词：液体聚异戊二烯 微观构型 增塑剂 天然橡胶 

分 类 号：TQ333.3[化学工程—橡胶工业]