Chem. J. Chinese Universities ›› 2025, Vol. 46 ›› Issue (5): 20240542.doi: 10.7503/cjcu20240542

• Polymer Chemistry • Previous Articles     Next Articles

Stereospecific Polymerization of 1,3-Dienes Catalyzed by Fe-based Catalysts with P/N Electron Donors

XU Shiliang, ZHAO Yingnan, YU Yao, NA Lihua, FANG Liang, LIU Heng, ZHANG Chunyu(), ZHANG Xuequan   

  1. Key Lab of Rubber?Plastics,Ministry of Education/Shandong Provincial Key Laboratory of Rubber and Plastics,Key Laboratory of Advanced Rubber Material,Ministry of Education,School of Polymer Science and Engineering,Qingdao University of Science and Technology,Qingdao 266042,China
  • Received:2024-12-16 Online:2025-05-10 Published:2025-03-18
  • Contact: ZHANG Chunyu E-mail:cyzhang@qust.edu.cn
  • Supported by:
    the National Key Research and Development Program of China(2022YFB3704700)

Abstract:

The effects of different phosphorus-nitrogen compounds on the polymerization of 1,3-butadiene and isoprene catalyzed by iron(III) acetylacetonate/aluminium alkyl[Fe(acac)3/AlR3] were investigated. The results show that the use of isocyanoimino-triphenylphosphorane(IITP) as an electron donor can synthesize syndiotactic 1,2-polybutadiene(PBd) and 3,4-polyisoprene(PIp) with high activity in hexane, and the highest catalytic activity achieve 1.52×106 gPBd/molFe and 1.47×106 gPIp/molFe. The obtained polybutadiene displays a low melting point (Tm, 64.0—115 ℃), and the molar fraction of 1,2-unit can reach up to 80.2%. The molar fraction of 3,4-unit of polyisoprene is between 48.8%—52.4%, and the temperature of glass transition(Tg) is kept from -18.5 ℃ to -15.8 ℃. The unimodal distribution high-temperature gel permeation chromatography(HTGPC) curve indicates that the catalytic system has a single active center. Moreover, the quasi living polymerization characteristics of the catalytic system are verified through kinetics and seeding polymerization experiments of isoprene.

Key words: Coordination polymerization, Conjugated diene, Fe-based catalyst, Electron donor

CLC Number: 

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