摘要
研究了MMA-St在氧化还原引发剂KPS-CuSO_4-Na_2SO_3存在下的快速无皂乳液聚合.当[MMA]=0.51mol/L、[St]=0.49 mol/L、70℃对,在[KPS]=2.77×10^(-3)mol/L、[CuSO_4]=1.50×10^(-5)mol/L、[Na_2SO_3]=2.77×10^(-3) mol/L条件下反应100min,转化率大于90％;讨论了胶乳的分子量及其分布;求出了聚合反应活化能E_a=81.6 kJ/mol和聚合反应速率常数k_p=321.9 L/mol·s.
Rapid emulsifier-free emulsion polymerization of methyl methacrylate-styrene was discussed in the presence of redox initiator KPS-CuSO<-Na2SO3. When [MMA]=0. 51 mol/L, [St] = 0. 49 mol/L, temp. 70℃, more suitable quantity of redox initiator was obtained: [KPS]=2. 77× 10-3 mol/L, [CuSO4]=l. 50×10-5 mol/L, [Na2SO3]=2. 77×10-3 mol/L. Reaction time was 100 min. Under the conditions as indicates above, the conversion of monomers surpassed 90%. Restrictive aggregation of emulsion particles existed in the process of reaction. Molecular weight and its distribution of emulsion which were produced by three system of emulsion polymerization are discussed. According to Arrheniu's figuration, the activation energy of polymerization (Ea = 81. 6 kJ/mol) was counted. The reaction rate constant kp=321. 9 L/mol · s) at 70℃ was calculated.
出处
《高等学校化学学报》
SCIE
EI
CAS
CSCD
北大核心
1993年第3期428-431,共4页
Chemical Journal of Chinese Universities
关键词
无皂乳液聚合
甲基
丙烯酸甲酯
Emulsifier-f ree emulsion polymerization, Methyl methacryiate, Styrene, Redox initiator
