镍－醇酯体系聚丁二烯分子量的控制

研究了Ｎｉ（ｎａｐｈ）２－Ａｌ（ｉ—Ｂｕ）３—ＢＦ３·ＯＥｔ２＋ｎ—Ｃ８Ｈ１７ＯＨ（简称Ｎｉ—Ａｌ—Ｂ十ＲＯＨ）和Ｎｉ（ｎａｐｈ）２－Ａｌ（ｉ—Ｂｕ）３－ＢＦ３·ＯＥ１２十ＣＨ３ＣＯＯＣ４Ｈ９（简称Ｎｉ－Ａｌ—Ｂ＋ＢＡ）两体系在加氢汽油中引发丁二烯聚合的分子量控制方法，并与Ｎｉ－Ａｌ—Ｂ体系进行了比较。结果表明：在催化剂用量相同时，Ｎｉ—Ａｌ—Ｂ＋ＲＯＨ和Ｎｉ－Ａｌ—Ｂ＋ＢＡ两体系所得聚合物的分子量均比Ｎｉ—Ａｌ—Ｂ体系的高；Ｎｉ／Ｂｄ、Ａｌ／Ｎｉ比的变化对聚合物的分子量及其分布影响不显著，Ａｌ／Ｂ比才是影响聚合物分子量的关键因素；聚合温度升高，分子量降低，而分子量分布变化不大。

Molecular Weight Control of Polybutadiene Catalysed With Nickel-Alcohol/Ester Systems

Molecular weight controlling methods of polybutadiene catalysed with Ni (naph)2 -Al (i-Bu)3 -BF3. OE2 +n-C8H17OH (shortened aS Ni-Al-B+ROH)and Ni (naph)2 -Al(i-Bu)3 -BF3. OE2 + CH 3 COOC4 H 9 (Ni-Al-B+BA) systems in hyd rogenated gasol me were in vestigated. Both of the two syatems were comaaed with the usual Ni-Al-B system. The molecular weights of the Products with Ni-Al-B+ROH and Ni-Al-B+BA Systems were greater than that of with Ni-Al-B System. Al/B molar ratio was a key parameter that affected the molecular weight and its distribution of products,but the effects of Ni/Bd and A]/Ni molar ratios were not significant. Molecular weight decreaSed with the incrare of polymerising temperature,but its distribution did not change considerably.