稀土学报(英文版)
稀土學報(英文版)
희토학보(영문판)
JOURNAL OF RARE EARTHS
2002年
5期
538-540
,共3页
李刚%张学全%应来强%巴小微%崔冬梅%唐涛%金鹰泰
李剛%張學全%應來彊%巴小微%崔鼕梅%唐濤%金鷹泰
리강%장학전%응래강%파소미%최동매%당도%금응태
rare earths%lanthanide amides%acrylonitrile%polymerization
The polymerization of acrylonitrile was studied using (diisopropylamido)bis(indenyl) lanthanides, Ind2LnN(i-Pr)2(Ln=Y, Yb) as a single-component catalyst. The effects of the amount of catalyst, monomer concentration and polymerization temperature on catalytic activity and molecular weight of polyacrylonitrile(PAN) were studied. The results show that the catalytic activity is raised obviously with rising polymerization temperature. The monomer conversion reaches 64% under polymerization temperature, monomer concentration and catalyst concentration are 50 ℃, 5.1 mol*L-1 and 0.3%(molar ratio) sequentially. The conversion and molecular weight of the polymer increase appreciably with adding additive, PhONa. When the molar ratio of PhONa to the catalyst is three, the conversion and the molecular weight is 76% and 1.32×104, respectively. The initiation mechanism for the polymerization of acrylonitrile was proposed.
