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Citation: LI Guilian, REN Changyou, DONG Weimin, JIANG Liansheng, ZHANG Xuequan. Separation and Polymerization of Active Species Using Neodymium Chloride Isopropanol Complex/Triisobutylaluminium as Catalyst[J]. Chinese Journal of Applied Chemistry, ;2011, 28(9): 993-998. doi: 10.3724/SP.J.1095.2011.00010 shu

Separation and Polymerization of Active Species Using Neodymium Chloride Isopropanol Complex/Triisobutylaluminium as Catalyst

1.
a Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, 130022;
2.
b College of Chemistry and Chemical Engineering, Luoyang Normal University, Luoyang

Corresponding author: ZHANG Xuequan,
Received Date: 6 January 2011
Available Online: 9 March 2011
Fund Project: 国家科技支撑计划(2007BAE14B01,2007BAE32B01) (2007BAE14B01,2007BAE32B01)吉林省科技发展项目(200505254) (200505254)

The reaction product between NdCl₃·3ⁱ PrOH and Al(i-Bu)₃ as catalysts was separated into a soluble and an insoluble part in hexane, and isoprene polymerization behaviors and characteristics of hexanesoluble and insoluble fractions were examined. The results indicated that the hexane-soluble fraction of the catalyst aging with the(Nd+Al) preformation had no activity at room temperature and at 70℃, and the catalytic precipitate obtained at 70℃ had no active too. The catalysts with the(Nd+IP+Al) preparation pattern showed activity of polymerization at both room temperature and 70℃. We speculated that there are two catalyst active centers of (isoprenyl)₂NdCl and (isoprenyl)NdCl₂ in the polymerization system. The catalytic prepared methods had no effect on the microstructures of polyisoprene(about 96%). The molecular mass of the polyisoprenes obtained by the suspension catalyst and precipitate catalyst was high(M_n >100×10⁴) and the molecular mass distribution was narrow(M_w/M_n< 2.0), while the polyisoprene obtained by the clear solution catalyst had lower molecular mass(M_n< 30×10⁴) and a very wide molecular mass distribution(M_w/M_n >5.0).
- neodymium,
- alkyl aluminum,
- isoprene,
- polyisoprene
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