酸性膦酸酯钕盐催化丁二烯在苯乙烯溶剂中的选择性聚合

Selective polymerization of butadiene in styrene catalyzed by neodymium phosphonate

以酸性膦酸酯钕盐Nd(P507)3(简称Nd)、氢化二异丁基铝(简称Al)和倍半乙基铝(简称Cl)为催化剂体系,研究了丁二烯在苯乙烯溶剂中的选择性聚合,考察了溶剂种类、Al/Nd、Cl/Nd及温度对聚合的影响。结果表明,该催化剂体系可在苯乙烯溶剂中实现丁二烯的选择性聚合,在Al/Nd(摩尔比)为10、Cl/Nd(摩尔比)为2.0及聚合温度为50℃的条件下,丁二烯的转化率可达90%以上;聚合物中苯乙烯链节的摩尔分数在4%以下,丁二烯链节的顺式-1,4-结构摩尔分数为90%左右,1,2-结构摩尔分数为4%左右。

The solution polymerization of 1,3-butadiene（Bd） was investigated in styrene （St） with the catalyst system comprised of neodymium phosphonate Nd （ P507 ）3 （ Nd）, Al （i-au）2H （Al） and Et3Al2Cl3（Cl）, the effects of solvent, Al/Nd, Cl/ Nd and polymerization temperature on the polymerization of Bd were examined. The results indicated that the selective polymerization of Bd was achieved in St by the above catalyst. The polymer yield was up to 90% at 50 ℃ , Al/Nd（mole ratio） of 10 and Cl/Nd（mole ratio） of 2.0. The produced polymer had mole fraction of 1,2-unit of 4% , mole fraction of cis-1,4-unit of 90% and mole fraction of St unit of bellow 4%.