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本文以叔丁氧基钾-正丁基锂作引发剂,甲苯作溶剂,在无极性添加剂及添加极性试剂二种情况下,研究了丁二烯阴离子聚合反应速率若干因素。在K/Li=1.1,A/Li=0,温度为0℃情况下,引发剂浓度与聚合反应速率R_p呈一级关系,表观增长速率常数k_(ap)不随引发剂浓度的增大而改变;在K/Li=0.5和1.1,A/Li=0,k′=2/100条件下,k_(ap)相差较大,但表观增长活化能E_(ap)均为45.2kJ/mol;K/Li<1.0时,Rp随K/Li增加不断增加,K/Li>1.0后,Rp逐步趋向不变。体系中添加极性给电子试剂,能够极大地提高聚合反应速率。
In this paper, potassium tert-butoxide-n-butyllithium as initiator, toluene as solvent, in the case of non-polar additives and added two kinds of polar reagents, butadiene anionic polymerization reaction rate of several factors. Under the conditions of K / Li = 1.1, A / Li = 0 and temperature 0 ℃, the concentration of initiator and the polymerization rate Rp showed a first order relationship. The apparent growth rate constant k ap did not change with the increase of initiator concentration (K) = 2/100 with K / Li = 0.5 and 1.1, A / Li = 0 and k ’= 2/100, but the apparent activation energies E ap are 45.2 kJ / mol ; When K / Li <1.0, Rp increased with the increase of K / Li. After K / Li> 1.0, Rp gradually tended to change. Polarity to the system to add electronic reagent, can greatly improve the polymerization rate.