From cylindrical to spherical nanosized micelles by self-assembly of poly(dimethylsiloxane)-b-poly(acrylic acid) diblock copolymers

Abstract

PDMS-b-PAA block copolymers were synthesized in a two-step procedure. The first step involves atom transfer radical polymerization (ATRP) of the protected ethoxyethyl acrylate (EEA) monomer initiated with α-bromopoly(dimethylsiloxane) (PDMS) (\( \bar{M}_{\text{n}} \) = 10,000 g/mol) macroinitiator. In the second step the synthesized poly(dimethylsiloxane)-b-poly(ethoxyethyl acrylate) (PDMS-b-PEEA) was deprotected by thermal treatment. The aggregation properties of the copolymers were investigated by atomic force microscopy (AFM) and dynamic light scattering (DLS). The influence of the polymer concentration, the length of the PAA block, the (mixed) solvent composition, and annealing on the size and the shape of the aggregates was evaluated. The results show that the aggregate size and morphology can be successfully controlled by tuning the experimental conditions. These copolymers might possibly be used in the preparation of adhesive materials.

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Acknowledgments

The work is supported by the ARC BIOMIME project (ARC AUWB-2008-08/12-UMH15), the Science Policy Office of the Belgian Federal Government (PAI 7/05 FS2), and FNRS-FRFC. Ph.L. is a senior research associate of FRS-FNRS (Belgium).

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Correspondence to Rosica Mincheva or Philippe Dubois.

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Kalinova, R., Ngo, T.C., Mincheva, R. et al. From cylindrical to spherical nanosized micelles by self-assembly of poly(dimethylsiloxane)-b-poly(acrylic acid) diblock copolymers. Polym. Bull. 73, 2129–2146 (2016). https://doi.org/10.1007/s00289-016-1598-2

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Keywords

  • PDMS
  • Block Copolymer
  • Dynamic Light Scattering
  • Atom Transfer Radical Polymerization
  • Atom Transfer Radical Polymerization