摘要
本文合成了稀土三合三氟乙酰丙酮二水合配合物(Ln(TFA)_3·2H_2O)。研究了Ln(TFA)_3·2H_2O～Al(i—Bu)_3—Ⅲ络合体系催化环氧氯丙烷(ECH)开环聚合特征,发现Pr、Tm、Yb、Y等11种稀土元素的络合催化剂都具有一定的催化活性。Tm(TFA)_3—Al(i—Bu)_3—acac络合催化ECH开环聚合速率与ECH的浓度呈一级关系,聚合表现活化能Ea=434KJ·mol^(-1)。
The tri(fluoroacetylacatonato) rare earch element complexes CLn(TFA)3·2H2O] are synthesized. The Ln(TFA)32H2O-Al(i-Bu)3-I were used as catalyst for ring opening polymerization of epichlorohydin(ECH). It was found that coordination catalysts composed of Y, La, Pr, Sm, Eu, Tb, Dy, Ho, Er, Tm, Yb all have catalytic activities for the polymerization of ECH. The ring opening Polymerization of ECH by Tm(TFA)3-Al(i-Bu)3-acac is of first order with respect tn monomer concentration. The activation energy of the polymerization reaction is 43. 4 KJ. mol-1.
基金
浙江省自然科学基金
国家自然科学基金
关键词
稀土族
络合物
环氧氯丙烷
催化剂
tri (fluoroacetylacetonato) rare earch complexes
epichlorohydin
ring opening polymerization
activation energy
