Synthesis and investigation of surface properties of dendrimer-like copolymers based on polystyrene and poly(tert-butylacrylate)

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The synthesis of well-defined second-generation PS nPtBA 2n, dendrimer-like copolymers based on polystyrene (PS) and poly(tert-butylacrylate) (PtBA.) is described. The synthetic procedure involves a combination of atom transfer radical polymerization (ATRP) using multifunctional initiators and chain end modification reactions. These structures are composed of a PS core with 2, 4, 6, or 8 arms and a corona of PtBA with 4, 8, 12, or 16 arms, respectively. Third-generation PS nPS 2nPtBA 4n dendrimer-like copolymers were also derived by repetition of chain end modification and ATRP. Characterization was carried out by size exclusion chromatography online with multiangle laser light scattering and by 1H NMR spectroscopy. PS nPAA 2n amphiphilic structures based on PS and poly(acrylic acid) (PAA) were subsequently generated by hydrolysis of the tert-butylester groups. Langmuir monolayer studies of PS nPtBA 2n showed the formation of stable films. AFM images demonstrated a significant change in morphology upon increasing surface pressures. © 2005 American Chemical Society.

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