Thermal Softening of Superswollen Polyelectrolyte Microcapsulesстатья
Статья опубликована в высокорейтинговом журнале
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Статья опубликована в журнале из списка Web of Science и/или Scopus
Дата последнего поиска статьи во внешних источниках: 18 июля 2013 г.
Аннотация:We study the effect of temperature on the mechanical properties of polyelectrolyte microcapsules
assembled by layer-by-layer (LbL) deposition of polystyrene sulfonate (PSS)/polyallylamine
hydrochloride (PAH). Capsules are initially significantly swollen (superswollen) as a result of the
osmotic effect caused by in situ polymerization of inner PSS. It is well known that hollow PSS/PAH
microcapsules are insensitive to temperature changes. However, we show that the heat treatment of
superswollen capsules introduces additional plastic deformation and leads to an additional softening of
a highly stretched polyelectrolyte shell. A simple model is provided to characterize the elasto-plastic
behavior of the microcapsules under consideration. This finding suggests an alternative method to
control mechanical properties of the multilayer shell.