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Hydroplasticization effect in structured latex particles film formation
Author(s) -
Snuparek Jaromir,
Kadrnka Bohuslav,
Ritz Pavel,
Quadrat Otakar
Publication year - 2002
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 - 10.1002/1521-3900(200209)187:1<357::aid-masy357>3.0.co;2-1
Subject(s) - copolymer , polymer chemistry , methacrylic acid , materials science , butyl acrylate , styrene , acrylate , methacrylate , polymer , carboxylic acid , monomer , swelling , acrylic acid , chemical engineering , composite material , engineering
Series of emulsion copolymers with structured particles were synthesized comprising copolymerized acrylic or methacrylic acid in the outer layer. All samples were based on particles, containing identical cores slightly crosslinked by allyl methacrylate and variable shells, weight ratio core/shell being constant 1/1. Each sample contained 10 wt% HEMA in the shell to achieve the film crosslinkability. In both series samples with different hardness and polarity (varible styrene/butyl acrylate ratio) of the shell layer were prepared. It was shown that the extent of particle swelling and hydroplasticization depends not only on the content of dissociated carboxylic groups, but also on the composition and crosslinking of the rest of polymer chain i.e. on its polarity and rigidity and on the origin of carboxylic groups. The effect of dissociated carboxylic groups on lowering the minimum film forming temperature was much more pronounced if the polymer chains were more polar.