摘要
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,研究了甲基丙烯酸甲酯(MMA)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MMA的聚合速率方程为Rp=K[ACPMA]0.57[BPO]0.71[MMA]1.63,聚合反应的表观活化能Ea=38.06 kJ.mol-1。
The kinetics of methyl methacrylate （MMA） polymerization initiated by 4, 4′-Azobis （4-cyanopentanoyl （pdimethylamino） anilide（ ACPMA ）/dibenzoyl peroxide （ BPO ） redox system in N, N-dimethylformamide （ DMF ） was studied by dilatometer method. The influence of concentrations of ACPMA, BPO, monomer and temperature on the polymerization rate and molecular weight of polymers were inspected. The reaction order and the activation energy were determined. The results indicated that the polymerization rate increases with increasing the concentrations of ACPMA, BPO, monomer as well as the reaction temperature. The molecular weight increases with increasing the concentration of monomer. The molecular weight decreases with increasing the concentration of ACPMA, BPO and the reaction temperature. The system has the characteristic of a redox initiation system. The equation of the polymerization rate is Rp = K[ ACPMA] 0.37[ BPO] 0.71[ AAM] 1.63 with an apparent activation energy of 38.06 kJ · mol^-1 for MMA polymerization.
出处
《化学研究与应用》
CAS
CSCD
北大核心
2009年第6期828-832,共5页
Chemical Research and Application
