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A Molecular Model for Toughening in Double-Network Hydrogels

Published

Author(s)

Vijay Tirumala, Sanghun Lee, Taiki Tominaga, Eric K. Lin, Jian P. Gong, Paul D. Butler, Wen-Li Wu

Abstract

A molecular mechanism is proposed for the toughness enhancement observed in double network (DN) hydrogels prepared from poly (2 acrylamido, 2-methyl, 1-propanesulfonicacid) (PAMPS) polyelectrolyte network and polyacrylamide (PAAm) linear polymer. It is an extension of the phenomenological model set forth recently by Gong et al (Macromolecules 2007, 40, 6658-6664). This mechanism rationalizes the changes in molecular structure of the DN-gel constituents observed via in-situ neutron scattering measurements, the composition dependence of the solution viscosity, and the thermodynamic interaction parameters of PAMPS and PAAm molecules obtained previously from neutron scattering studies. More specifically, this proposed mechanism provides an explanation for the observed periodic compositional fluctuations in the micrometer range induced by large strain deformation.
Citation
Journal of Physical Chemistry B

Keywords

hydrogels, tough, neutron scattering, stress transfer, molecular model

Citation

Tirumala, V. , Lee, S. , Tominaga, T. , Lin, E. , Gong, J. , Butler, P. and Wu, W. (2008), A Molecular Model for Toughening in Double-Network Hydrogels, Journal of Physical Chemistry B, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=853627 (Accessed May 24, 2024)

Issues

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Created June 18, 2008, Updated February 19, 2017