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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=K[BPO]0.48[ACPMA]0.54[St]1.53,聚合反应的表观活化能Ea=39.6 kJ/mol.
The effects of 4,4’-azobis [4-cyanovaleryl (p-dimethylamino) aniline] (ACPMA) / dibenzoyl peroxide (BPO) ) In N, N-dimethylformamide (DMF) and its kinetic behavior were investigated.The effects of polymerization temperature, monomer concentration, ACPMA concentration and BPO concentration on the polymerization rate and the molecular weight of the polymer were investigated. The reaction order and the activation energy of the polymerization were investigated.The results showed that the polymerization rate increased with the increase of monomer concentration, the concentration of ACPMA, the concentration of BPO and the reaction temperature in a certain range. The molecular weight With the increase of monomer concentration, with increasing concentration of ACPMA, the concentration of BPO increased and the reaction temperature decreased.The system has the characteristics of redox initiation system, which led to the polymerization rate equation of St Rp = K [BPO] 0.48 [ACPMA] 0.54 [St] 1.53, and the apparent activation energy of polymerization Ea = 39.6 kJ / mol.