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Issue 6, 2011
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Thermal softening of superswollen polyelectrolyte microcapsules

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Abstract

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 situpolymerization 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.

Graphical abstract: Thermal softening of superswollen polyelectrolyte microcapsules

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Publication details

The article was received on 06 Aug 2010, accepted on 01 Dec 2010 and first published on 24 Jan 2011


Article type: Paper
DOI: 10.1039/C0SM00781A
Citation: Soft Matter, 2011,7, 2705-2708
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    Thermal softening of superswollen polyelectrolyte microcapsules

    B. Kim, T. Fan and O. I. Vinogradova, Soft Matter, 2011, 7, 2705
    DOI: 10.1039/C0SM00781A

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