Dispersion Polymerization Using Hydroxy-Functional Macroazoinitiators as an Inistab

作者：Fujii Syuji^*; Suzaki Motomichi; Kakigi Yuichi; Aono Kodai; Yusa Shin Ichi; Nakamura Yoshinobu

来源：Journal of Polymer Science Part A: Polymer Chemistry , 2011, 49(7): 1633-1643.

DOI：10.1002/pola.24587

• dispersions
• hydroxy-functional polymers
• initiators
• nanoparticles

Hydroxy-functional macroazoinitiators with central azo unit have been synthesized by atom transfer radical polymerization of 2-hydroxyethyl methacrylate or 2-hydroxypropyl methacrylate in methanol. The mean degrees of polymerization of the polymer chains beside the azo group were fixed at 30 and 60. Proton nuclear magnetic resonance ((1)H NMR) and gel permeation chromatography were used to characterize the macroazoinitiators in terms of their chemical structure, molecular weight, and polydispersity, respectively. Dispersion polymerizations of styrene using the hydroxy-functional macroazoinitiators as an inistab (initiator + colloidal stabilizer) in 2-propanol or 2-propanol/water media resulted in submicro-meter-sized polystyrene latex particles with hydroxy-functional polymer hair. Electron microscopies, Fourier transform infrared spectrometer, thin layer chromatography, and (1)H NMR were used to characterize the particles in terms of their morphologies, particle sizes, and their distributions and chemical compositions. The synthesized particles behaved as an effective particulate emulsifier for the stabilization of oil-in-water emulsions.

• 出版日期2011-4-1