镍催化体系合成低分子聚丁二烯

Polybutadiene of low molecular weight with nickel catalytic system

研究了Ｎｉ（ｎａｐｈ）２－Ａｌ（ｉ－Ｂｕ）３－ＢＦ３·ＯＥｔ２－Ｃ８Ｈ１７ＯＨ体系合成低分子聚丁二烯，考察了Ａｌ／Ｂ摩尔比、Ａｌ／Ｎｉ摩尔比、Ｎｉ／Ｂｄ摩尔比、Ｃ８Ｈ１７ＯＨ／Ｂ摩尔比等反应条件对聚合活性及聚合产物分子量的影响。实验结果表明，该体系在Ａｌ／Ｂ比于０１５～０３０之间时，随着Ａｌ／Ｂ比的降低，聚合活性下降，聚合物分子量也降低。由于辛醇的作用，聚丁二烯的特性粘数最低可降至０５ｄＬ／ｇ。Ａｌ／Ｂ比的变化对聚合活性及聚合物分子量的影响显著，Ａｌ／Ｂｄ比、Ｎｉ／Ｂｄ比。

The behavior of butadiene polymerization with Ni(naph) 2(Ni)-Al(i-Bu) 3(Al) BF 3·OEt 2(B)-C 8H 17 OH catalytic system was investigated.The effects of polymerization conditions on the catalytic activity、the molecular weight were also examined.It revealed that when the range of Al/B mole ratio was from 0.15 to 0.3,the catalytic activity was greatly reduced and the molecular weight was sharply decreased with the decrease of Al/B mole ratio.As the result of the effect of C 8H 17 OH the lowest value of the intrinsic viscosity reached 0.5dl/g.The results showed that the catalytic activity and the molecular weight were influenced by Al/B mole ratio changing,while they were little influenced by Al/Ni、Ni/Bd mole ratio.