Abstract
The effects of chloride donor and aging temperature of neodymium isopropoxide /diisobutylaluminum hydride / chloride donor( Nd( OiPr)3/ Al( iBu)2H / RCl) catalyst on isoprene polymerization were investigated. The resulting polymer was fully assessed by NMR,IR and GPC. Chloride donors greatly influenced the relative molecular mass distribution( MWD) of plyisoprene and only Nd( OiPr)3/ Al( iBu)2H / Me2SiCl2catalytic system could afford polyisoprene with a narrow MWD. In the Nd( OiPr)3/ Al( iBu)2H / Me2SiCl2catalytic system,the polymerization results showed that MWD of polyisoprene kept around 1. 5 when the catalyst was aged at 0 ~ 50 ℃ and became much broader( MWD 6. 0) when the aging temperature was above 50 ℃. Additionally,the yield and 1,4-content of polyisopere increased with the aging temperature.
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