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Controlled polymerization of higher alkyl methacrylates, e.g. lauryl methacrylate (LMA) and stearyl methacrylate (SMA) has been successfully achieved by atom transfer radical polymerization (ATRP) at ambient temperature using CuCl/N,N,N′,N′,N″-pentamethyldiethylenetriamine (PMDETA)/tricaprylylmethylammonium chloride (Aliquat ® 336) as the catalyst system and ethyl 2-bromoisobutyrate or 2,2,2-trichloroethanol...
Amphiphilic di- and tri-block copolymers of poly(methyl methacrylate) (PMMA) and poly(2-dimethylamino)ethyl methacrylate (PDMAEMA) have been synthesized by atom transfer radical polymerization (ATRP) at ambient temperature (35°C) in the environment-friendly solvent, aqueous ethanol (water 16vol%) using CuCl/o-phenanthroline as the catalyst. The PDMAEMA blocks are contaminated with ethyl methacrylate...
ATRP of several methacrylates viz. methyl methacrylate (MMA), ethyl methacrylate (EMA), n-butyl methacrylate (nBMA), t-butyl methacrylate (tBMA), benzyl methacrylate (BzMA) and (N,N-dimethylamino)ethyl methacrylate (DMAEMA) has been studied in neat as well as aqueous (up to 12vol% water) acetone at 35°C using CuCl/bipyridine (bpy) catalyst and ethyl 2-bromoisobutyrate as the initiator. Addition of...
Unlike poly(phenyl acrylate) (PPA), its isomer poly(vinyl benzoate) (PVBZ) is immiscible with poly(styrene-co-acrylonitrile) (SAN). The difference in miscibility behaviour of PPA and PVBZ towards SAN is also reflected in the heats of mixing (ΔH m ) of the low-molecular-weight analogues of the respective blend components at compositions corresponding to φ SAN = 0.92 in the...
Oxidative dispersion polymerization of pyrrole using ethylhydroxyethylcellulose stabilizer in water or aqueous alcohol medium yields stable dispersions of submicrometre-sized conducting spherical polypyrrole particles. Transmission electron micrograph images of the particles from the original dispersion distinguish two kinds of particles: one very small, 20 nm in diameter, and the other eight...
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