Citation: Jin-Yan Hou, Fang Guo, Qian Hu, Yang Li, Zhao-Min Hou. Neodymium-catalyzed Polymerization of C₅ Fraction: Efficient Synthesis of 1,3-Pentadiene-isoprene Copolymer Rubbers[J]. Chinese Journal of Polymer Science, ;2019, 37(7): 674-680. doi: 10.1007/s10118-019-2244-x shu

Neodymium-catalyzed Polymerization of C₅ Fraction: Efficient Synthesis of 1,3-Pentadiene-isoprene Copolymer Rubbers

Jin-Yan Hou ¹ ,
Fang Guo ^1,, ,
Qian Hu ² ,
Yang Li ¹ ,
Zhao-Min Hou ^1,3

a.
State Key Laboratory of Fine Chemicals, Department of Polymer Science and Engineering, School of Chemical Engineering, Dalian University of Technology, Dalian 116012, China
b.
Fushun Yikesi New Material Co., Ltd., Fushun 113000, China
c.
Advanced Catalysis Research Group, RIKEN Center for Sustainable Resource Science, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan

Corresponding author: Fang Guo, guofang@dlut.edu.cn
Received Date: 16 January 2019
Revised Date: 10 February 2019
Available Online: 26 March 2019

The polymerization of C₅ fraction without separation and concentration by using a commercial available Nd(P₂₀₄)₃/AlⁱBu₃/AlEt₂Cl has afforded for the first time a new kind of 1,3-pentadiene-isoprene random copolymers as rubber materials. Isoprene (IP) and E-1,3-pentadiene (EPD) acted as polymerization monomers, cyclopentadiene acted as poison, and other substances like alkanes, monoolefins, Z-1,3-pentadiene acted as solvents in this multicomponent C₅ fraction polymerization system. The data of kinetic experiments, NMR, and DSC indicated that the polymerization of C₅ fraction by Nd(P₂₀₄)₃/AlⁱBu₃/AlEt₂Cl afforded the IP-EPD random copolymers. By controlling polymerization conditions such as [Al]/[Nd]/[Cl] molar ratio and polymerization temperature, the random EPD-IP copolymers containing high cis-1,4-poly(IP) (with selectivity 96%) and moderate cis-1,4-poly(EPD) (with selectivity 60%) units with a low glass transition temperature (about −60 °C), controllable molecular weight (M_n = 3.8 × 10⁴‒14.3 × 10⁴), and moderate molecular weight distribution (M_w/M_n = 2.17‒2.78) were obtained in a high yield.
- C₅ fraction,
- Neodymium,
- Isoprene,
- 1,3-Pentadiene,
- Copolymerization
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Neodymium-catalyzed Polymerization of C₅ Fraction: Efficient Synthesis of 1,3-Pentadiene-isoprene Copolymer Rubbers