聚酰胺胺树状大分子作为种子的乳液聚合动力学及乳胶粒径  

Kinetic and Particle Size for Emulsion Polymerization by Using Polyamidoamine Dendrimer as Seed

作　　者：章昌华[1] 李磊[1] 吴英[1] 陈升[1] 鲁礼权 张凯[1] 

机构地区：[1]安徽工业大学化学与化工学院,安徽马鞍山243002

出　　处：《高分子材料科学与工程》2016年第11期18-22,共5页Polymer Materials Science & Engineering

基　　金：国家级大学生创新项目(201510360016);校级大学生创新项目(2015028Y)

摘　　要：以聚酰胺胺(PAMAM)树状大分子作为种子,过硫酸铵(APS)为引发剂,十二烷基苯磺酸钠(DBS)为乳化剂,进行了苯丙乳液聚合动力学研究。考察了3.0GPAMAM树状大分子浓度、引发剂浓度、乳化剂浓度和反应温度对聚合动力学的影响,并研究了PAMAM树状大分子代数对乳胶粒子粒径的影响。实验结果表明,聚合反应速率随3.0GPAMAM树状大分子浓度的升高先增加后降低,随反应温度、引发剂浓度和乳化剂浓度升高而加快;在3.0GPAMAM树状大分子浓度小于2.392×10^(-4)mol/L时,聚合反应动力学关系式为Rp∝[3.0GPAMAM]^(0.87)[DBS]^(0.507)[APS]^(0.256),表观活化能为66.91k J/mol;随着PAMAM树状大分子代数的增加,乳胶粒子的粒径逐渐减小,并呈现单分散性。The kinetics of emulsion polymerization of styrene and methyl methacrylate were carried out by using polyamidoamine dendrimer as seed, ammonium persulfate as initiator and sodium dodecyl benzene sulfonic acid as emulsifier. The effects of concentration, initiator concentration, emulsifier concentration, and polymerization temperature of 3.0GPAMAM dendrimer on polymerization rate were investigated. The influence of the generation of .polyamidoamine dendrimer on latex particle size was studied also. The results show that polymerization rate increases with increasing of initiator concentration, emulsifier concentration and polymerization temperature. But polymerization rate increases firstly and then decreases with further increasing of 3. 0GPAMAM dendrimer concentration. When the concentration of 3.0GPAMAM dendrimer is less than 2. 392 × 10-4 mol/L, the kinetic equation can be expressed by R v oc [ 3.0GPAMAM ] 0.87 [ DBS ] 0.507 [ APS ] 0.256, and the activation energy （ E a） of emulsion polymerization is 66.91 kJ/mol. In additional, the latex particle size decreases and possesses monodispersity with increasing the generation of polyamidoamine dendrimer.

关 键 词：聚酰胺胺 树状大分子 乳液聚合 动力学 乳胶粒径 

分 类 号：TQ316.334[化学工程—高聚物工业]