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Functionalised Microgels for Acrylic Coatings
Author(s) -
Machotová Jana,
Šňupárek Jaromír
Publication year - 2009
Publication title -
macromolecular symposia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.257
H-Index - 76
eISSN - 1521-3900
pISSN - 1022-1360
DOI - 10.1002/masy.200950726
Subject(s) - comonomer , materials science , swelling , copolymer , chemical engineering , dispersion (optics) , methacrylate , polymer chemistry , emulsion , solvent , emulsion polymerization , polymerization , polymer , aqueous solution , composite material , organic chemistry , chemistry , physics , optics , engineering
Summary: Aqueous acrylic dispersions of hydroxy‐functionalised copolymer microgel particles crosslinked with allyl methacrylate were synthesized by emulsion polymerization. The microgels were investigated as reactive polymer fillers in mixtures with a water‐borne film‐forming dispersion. Properties of coatings cast from mixtures of aqueous dispersion of hard microgel particles and film‐forming water‐borne dispersion were investigated. The swelling behaviour of microgels in selected solvents (aliphatic ketones) as a function of microgel composition is discussed as well. It was found that the swelling ability of microgels decreased with growing degree of crosslinking. Microgels comprising copolymerised butyl methacrylate swelled less in aliphatic ketones than microgels without this comonomer. This work was focused mainly on the influence of microgels incorporated in the commercial solvent‐borne acrylic binders on the properties of coatings. It was shown that the application of microgels that were redispersed in acetone did not affect the surface appearance and transparency of coatings. Moreover, the presence of microgel network precursors accelerated film curing at ambient temperature and improved the final hardness of coatings.