首页
最新动态 交流合作 科研项目 论文著作 精彩瞬间 招生招聘
  • Coordination Polymerization of Renewable (E)-4,8-Dimethyl- 1,3,7-Nonatriene by Rare-Earth Metal Catalysts
  • 来源:崔冬梅研究员个人网站 2022-06-28
  •   Coordination polymerization of renewable (E)-4,8-dimethyl-1,3,7-nonatriene (DMNT) has been performed using pyridyl-methylene-fluorenyl scandium complex 1, half-sandwich scandium complex 2, diiminophosphinato rare-earth metal complexes 3a—3c and 4a—4b, bis(phosphino)carbazolide yttrium complex 5 and β-diketiminato yttrium complex 6. Fluorenyl scandium complexes 1 and 2, activated by [Ph3C][B(C6F5)4] and AliBu3, are moderately active and show perfect 1,2-regioselective (1,2 >99%). Conversely, asymmetric diiminophophinato complexes 3a—3c promote the DMNT polymerization to produce high trans-1,4 regulated products with the activity trend: Sc < Lu < Y. Complexes 4—6 are virtually inactive for the DMNT polymerization although they are highly active in isoprene polymerization. A diblock copolymer bearing 3,4-polyisoprene block and trans-1,4-poly (DMNT) block is obtained using complex 3c in one-pot reaction. Hydrogenation of trans-1,4-poly (DMNT) affords an elastomer with a Tg of ?10 oC. The epoxidation reaction of trans-1,4-poly (DMNT) with 3-chloroperbenzoic acid transfers the pendant double bonds in the cis configuration into the epoxy groups.




  • [来源:中国聚合物网]
  • 了解更多请进入: 崔冬梅研究员个人网站
相关新闻
  • · Isospecific Polymerization of Halide- and Amino-Substituted Styrenes Using a Bis(phenolate) Titanium Catalyst
  • · Rare-Earth Metal Bis(alkyl) Complexes Bearing the FluCH2?THF Ligand: Synthesis, Structures, and Catalysis toward Polymerizations of Conjugated Dienes
  • · A Facile Approach to Produce Star Polymers Based on Coordination Polymerization
  • · Hydroboration of CO2 catalyzed by heteroscorpionate zwitterionic zinc and magnesium hydride complexes

关于我们  |  联系我们  

网站:中国聚合物网

polymer.cn Copyright ©2017