Styrene Miniemulsion Polymerization : Particle Nucleation Mechanism

• Main Authors: Chang Hung Te, 張宏德
• Other Authors: Chorng-Shyan Chern
• Format: Others
• Language: zh-TW
• Published: 2000
• Online Access: http://ndltd.ncl.edu.tw/handle/51477318308939608796

碩士 === 國立臺灣科技大學 === 化學工程系 === 88 === In STY miniemulsion polymerization stabilized by SDS/DMA or SDS/SMA，the system with SMA has slightly faster Rp than that with DMA. This is because more reaction loci （i.e.，latex particles）are generated in the polymerization stabilized by SMA.The number of latex particles originating from monomer droplets（Nd）is much small or than the number of primary particles formed via homogeneous nucleation（Nw）for the system stabilized by DMA. Homogeneous nucleation does play an important role in the reaction kinetics for the DMA stabilized system. The value of Nw is comparable to Nd. Thus，the relatively large population of primary particles generated via homogeneous nucleation cannot be neglected for the polymerization with SMA. The system with SMA also has lower zeta potential of latex particles than that with DMA. This is because more Np（DLS）are available in the polymerization stabilized by SMA. In STY miniemulsion polymerization stabilized by SDS/DMA, Rp and Xf increase with increasing [SDS]. Pdye，Nd and Nw also increase when [SDS] increases. In addition, the zeta potential of latex particles and Mw increases with incresing [SDS]. In STY miniemulsion polymerization stabilized by SDS/SMA, Rp and Np（TEM） increase with increasing [I]. Nw also increase when [I] increases.，Nd and Pdye decrease with increasing [I]. In addition, the zeta potential of latex particles increases with incresing [I].