改性镍系催化体系各组分反应的红外光谱研究

STUDY ON THE REACTION BETWEEN COMPONENTS OF MODIFIED NICKEL CATALYST SYSTEM BY IR METHOD

用红外光谱法研究了Ni(naph)_2-TIBA·DBMP-BF_3·OEt_2催化丁二烯聚合中催化剂组分之间的反应。发现TIBA与DBMP反应主要产生iBu_2AlOAr,它可延缓Ni(I)的继续被还原,从而提高了活性中心Ni(Ⅰ)的稳定性,使产物分子量大大提高,而凝胶含量降低。还根据DBMP与TIBA、Ni(naph)_2与TIBA·DBMP及BF_3·OEt_2反应产物的分析数据,推测了活性中心的结构。

The reaction between the catalyst components in Ni (naph)2-TIBA.DBMP-BF3.OEt2 system which catalyzed the polymerization of butadiene have been studied by IR method. It was found that the main product in the reaction between TIBA and DBMP was iBu2AlOAr which could delay the reduction of Ni(II), so as to stabilize the active center Ni(I). According to the analytical data of the products in the reaction between DBMP and TIBA, Ni (naph)2 and TIBA.DBMP and BF3.OEt2, an octahedra coordinated active center model was proposed.