Molecular model for toughening in double-network hydrogels

被引：61

作者：

Tirumala, Vijay R.

Tominaga, Taiki ^{[2
,3
]}

Lee, Sanghun

Butler, Paul D. ^{[1
]}

Lin, Eric K.

Gong, Jian Ping ^{[2
,3
]}

Wu, Wen-li

机构：

[1] NIST, Ctr Neutron Res, Natl Inst Stand & Technol, Gaithersburg, MD 20899 USA

[2] NIST, Div Polymers, Gaithersburg, MD 20899 USA

[3] Hokkaido Univ, Grad Sch Sci, Sapporo, Hokkaido 0600810, Japan

来源：

JOURNAL OF PHYSICAL CHEMISTRY B | 2008年 / 112卷 / 27期

关键词：

D O I：

10.1021/jp8002454

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 [物理化学]; 081704 [应用化学];

摘要：

A molecular mechanism is proposed for the toughness enhancement observed in double-network (DN) hydrogels prepared from poly(2-acrylamido-2-methyl-1-propanesulfonic acid) (PAMPS) polyelectrolyte network and poly(acrylamide) (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.

引用

页码：8024 / 8031

页数：8

共 45 条

[1]

Design and performance of a thermal-neutron double-crystal diffractometer for USANS at NIST [J].