Formation of monodisperse polyacrylamide particles by dispersion polymerization: particle size and size distribution
Formation of monodisperse polyacrylamide particles by dispersion polymerization: particle size and size distribution
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DOI：
10.1002/pi.1116
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发表时间：
2003-05
影响因子：
3.2
通讯作者：
Q. Ye;Zhicheng Zhang;X. Ge
中科院分区：
文献类型：
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作者：
Q. Ye;Zhicheng Zhang;X. Ge
摘要以聚N -乙烯基吡咯烷酮为空间稳定剂，在2,2 -偶氮二异丁腈引发的醇水介质中直接采用分散聚合法制备了高度单分散的聚丙烯酰胺微粒。用扩张法研究了单体转化，用粘度法测定了聚合物分子量。用动态激光散射光谱仪测量了聚合物颗粒的水动力直径及其分布。在聚合的早期阶段产生的核的数量在剩余的聚合过程中是恒定的。系统考察了引发剂浓度、单体浓度、稳定剂含量、介质极性、聚合温度等不同聚合参数对聚合产物粒度和粒径分布的影响。2003化工学会关键词：分散聚合；聚丙烯酰胺;单分散粒子;粒径及其分布；水溶性聚合物
Abstract: Highly monodisperse polyacrylamide microparticles were directly prepared by dis-persion polymerization in aqueous alcoholic media initiated by 2,2 -azobisisobutyronitrile usingpoly( N -vinylpyrrolidone) as a steric stabilizer. Monomer conversion was studied dilatometrically andpolymer molecular weight was determined viscometrically. The hydrodynamic diameter of polymerparticles and its distribution were measured with a dynamic laser light scattering spectrometer. Thenumber of the nuclei produced in the early stage of the polymerization was found to be constant duringthe remainder of the polymerization. The influences of various polymerization parameters, such as ini-tiator concentration, monomer concentration, stabilizer content, medium polarity, and polymerizationtemperature on the particle size and size distribution were systematically investigated. 2003 Society of Chemical Industry Keywords: dispersion polymerization; polyacrylamide; monodisperse particles; particle size and its distribution;water-soluble polymers