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Citation: Zhang Xinhui, Li Bailin, Liu Yadong, Gong Zhi. THE PROPERTIES OF POLYISOPRENE GUM BULK POLYMERIZED BY RARE-EARTH CATALYST[J]. Chinese Journal of Applied Chemistry, ;1993, 10(3): 91-93. shu

THE PROPERTIES OF POLYISOPRENE GUM BULK POLYMERIZED BY RARE-EARTH CATALYST

1.
Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, 130022, Changchun

Received Date: 12 May 1992
Available Online: 6 October 1992
Fund Project:

The properties of polyisoprene bulk polymerized with rare-earth catalyst (Ln-IR) are reported. The Mooney viscosity(ML) values of Ln-IR are obviously higher than that of Ln-IR obtained in solution polymerization with the same[η]. Under certain polymerization conditions, some long branching chains may occur in the molecular structure of Ln-IR. The cis-1,4 content of Ln-IR was slightly lower than that of Ti-IR and NR, but the stress-strain property and viscoelasticity were basically the same as that of Ti-IR. The bulk Ln-IR showed a good fluidity at higher shear rate. The activation energy of viscous flow was about 11.0 kJ/mol, equal to that of Ti-IR, but slightly lower than that of NR.
- polyisoprene,
- bulk polymerization,
- rare-earth catalyst,
- synthetic rubber
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