4,4′-偶氮二[4-氰基戊酰（对-二甲氨基）苯胺]/过氧化二苯甲酰引发苯乙烯聚合及其动力学研究

研究了以4,4′-偶氮二4-氰基戊酰(对-二甲氨基)苯胺](ACPMA)/过氧化二苯甲酰(BPO)为氧化还原引发体系,苯乙烯(St)在N,N-二甲基甲酰胺(DMF)中的聚合及其动力学行为.考察了聚合反应温度、单体浓度、ACPMA浓度和BPO浓度对聚合反应速率和聚合物分子量的影响,测定了反应级数和聚合反应的活化能.结果表明,在一定范围内,聚合反应速率随单体浓度增大、ACPMA浓度增大、BPO浓度增大和反应温度的升高而增大;聚合物分子量随单体浓度的增大而增大,随ACPMA浓度的增大、BPO浓度增大和反应温度的升高而降低.该体系具有氧化还原引发体系的特征,其引发St的聚合速率方程为Rp=KBPO]0.48ACPMA]0.54St]1.53,聚合反应的表观活化能Ea=39.6 kJ/mol.

Kinetics of Styrene Polymerization Initiated by 4,4'-Azobis (4-cynopentanoyl(p-dimethyl-amino)anilide) /Dibenzoyl Peroxide Redox System

The kinetics of styrene(St) polymerization initiated by 4,4'-azobis(4-cyanopentanoyl (p-dimethylamino) anilide)(ACPMA)/dibenzoyl peroxide(BPO) redox system was studied in N, N-dimethyl formamide(DMF). The effects of concentrations of the monomer, ACPMA, BPO and the temperature on the polymerization rate were studied. The reaction order and the activation energy were determined. The results indicated that the polymerization rate increases with increasing the concentrations of monomer, ACPMA, BPO as well as the reaction temperature. The system possesses the characteristics of a redox initiation system. The equation of the polymerization rate is Rp=KBPO]0.48ACPMA]0.54St]1.53 with an apparent activation energy of 39.6kJ/mol for styrene polymerization.