Journal
MACROMOLECULAR RAPID COMMUNICATIONS
Volume 25, Issue 20, Pages 1781-1785Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/marc.200400331
Keywords
crosslinking; layer-by-layer; PH sensitivity; stimuli-responsive; swelling
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We investigated microcapsules composed of the weak polyelectrolytes poly(allylamine hydrochloride) (PAH) and poly(methacrylic acid) (PMA) assembled on calcium carbonate cores. These capsules are stable in the PH range from 2.5 to 11.5, undergoing reversible swelling in the PH interval from 2.7 to 2.6. Capsule swelling occurs at a protonation degree above 90%. The pH-dependent size variation of PAW PMA capsules is blocked after crosslinking of the polyelectrolyte layers.
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