Morphologies and dynamic mechanical properties of core-shell emulsifier-free latexes and their copolymers for P(BA/MMA)/P(MMA/BA) and P(BA/MMA)/PSt systems in the presence of AHPS

Different poly(methyl methacrylate/n-butyl acrylate)/poly(n-butyl acrylate/methyl methacrylate) [P(BA/MMA)/P(MMA/BA)] and poly(n-butyl acrylate/methyl methacrylate)/polystyrene [P(BA/MMA)/PSt] core-shell structured latexes were prepared by emulsifier-free emulsion polymerization in the presence of hydrophilic monomer 3-allyloxy-2-hydroxyl-propanesulfonic salt (AHPS). The particle morphologies of the final latexes and dynamic mechanical properties of the copolymers from final latexes were investigated in detail. With the addition of AHPS, a latex of stable and high-solid content (60 wt %) was prepared. The diameters of the latex particles are ∼0.26 μm for the P(BA/MMA)/P(MMA/BA) system and 0.22–0.24 μm for the P(BA/MMA)/PSt system. All copolymers from the final latexes are two-phase structure polymers, shown as two glass transition temperatures (Tgs) on dynamic mechanical analysis spectra. © 2002 Wiley Periodicals, Inc. J Appl Polym Sci 86: 3078–3084, 2002

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