NIST logo

Publication Citation: A Molecular Model for Toughening in Double-Network Hydrogels

NIST Authors in Bold

Author(s): Vijay Tirumala; Sanghun Lee; Taiki Tominaga; Eric K. Lin; Jian P. Gong; Paul D. Butler; Wen-Li Wu;
Title: A Molecular Model for Toughening in Double-Network Hydrogels
Published: June 18, 2008
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
Research Areas: Materials Science
PDF version: PDF Document Click here to retrieve PDF version of paper (953KB)