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Synthesis and Characterization of Cellulose-Hybrid Polystyrene Nanoparticles by Using Reactive Hydroxypropyl Methylcellulose Phthalate  

Cheong In-Woo (Department of Applied Chemistry, Kyungpook National University)
Publication Information
Polymer(Korea) / v.30, no.5, 2006 , pp. 437-444 More about this Journal
Abstract
Reactive hydroxypropyl methylcellulose phthalate (reactive HPMCP) was synthesized by using a stepwise urethane reaction with isophorone diisocyanate (IPDI) and 2-hydroxyethyl moth acrylate (HEMA). Molecular weight, acid number, and critical micelle concentration (CMC) of the synthesized reactive HPMCP and pristine HPMCP were measured and used as a polymeric surfactant in the emulsion polymerizations of styrene. In the preparation of HPMCP-hybrid poly styrene nanoparticles, 6, 9, 12, 18, and 24 wt% of HPMCPs were introduced, and the maximum rate of polymerization ($R_{p,max}$), the average number of radicals per particle (n), particle size distribution were investigated. In addition, core - shell morphology of the nanoparticles were observed by using TEM and their thermal stabilities were measured by using TGA. Reactive HPMCP showed higher $R_{p,max}$, smaller particle size, larger values of n and gel contents as compared with pristine HPMCP, due to the vinyl groups from HEMA, which can be reacted with styrene oligomers, in the reactive HPMCP.
Keywords
hydroxypropyl methylcellulose phthalate; cellulose; nanoparticles; polymeric surfactants;
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