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Issue 7, 2013
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Relaxation modes in chemically cross-linked poly(2-methacryloyloxyethyl phosphorylcholine) hydrogels

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Abstract

We investigated the relaxation modes of autocorrelation functions obtained by dynamic light scattering (DLS) of chemically cross-linked zwitterionic hydrogels comprising poly(2-methacryloyloxyethyl phosphorylcholine) (PMPC) as the main chain of the network. A time- and space-averaged (i.e., an ensemble-averaged) autocorrelation function was obtained using a home-built DLS apparatus enabling automated positioning of a sample. The equilibrated hydrogels exhibited fast and slow relaxations; the former was derived from thermodynamic fluctuations of the polymer network whose cross-link distances were modeled by the Stokes–Einstein equation, whereas the latter depended on cross-linking densities, cross-linker type, and external electrolytes in the hydrogels, suggesting a mesoscopic weak segment–segment interaction driven by electrostatic forces or by the salting-out effect. These observations may aid in the regulation of network integrity and hydration state of the polymer in PMPC hydrogels.

Graphical abstract: Relaxation modes in chemically cross-linked poly(2-methacryloyloxyethyl phosphorylcholine) hydrogels

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Publication details

The article was received on 03 Oct 2012, accepted on 07 Dec 2012 and first published on 03 Jan 2013


Article type: Paper
DOI: 10.1039/C2SM27284A
Citation: Soft Matter, 2013,9, 2166-2171
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    Relaxation modes in chemically cross-linked poly(2-methacryloyloxyethyl phosphorylcholine) hydrogels

    T. Goda, H. Furukawa, J. P. Gong and K. Ishihara, Soft Matter, 2013, 9, 2166
    DOI: 10.1039/C2SM27284A

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