The molecular origin of enhanced toughness in double-network hydrogels: A neutron scattering study

被引：97

作者：

Tominaga, Taiki ^{[1
,2
]}

Tirumala, Vijay R. ^{[1
,3
]}

Lin, Eric K. ^{[1
]}

Gong, Jian Ping ^{[2
]}

Furukawa, Hidemitsu ^{[2
]}

Osada, Yoshihito ^{[2
]}

Wu, Wen-li ^{[1
]}

机构：

[1] Natl Inst Stand & Technol, Div Polymers, Gaithersburg, MD 20899 USA

[2] Hokkaido Univ, Grad Sch Sci, Sapporo, Hokkaido, Japan

[3] Univ Massachusetts, Amherst, MA 01003 USA

来源：

POLYMER | 2007年 / 48卷 / 26期

基金：

美国国家科学基金会;

关键词：

hydrogels; small-angle neutron scattering; solution blends;

D O I：

10.1016/j.polymer.2007.10.016

中图分类号：

O63 [高分子化学（高聚物）];

学科分类号：

070305 [高分子化学与物理]; 080501 [材料物理与化学]; 081704 [应用化学];

摘要：

Double-network hydrogels (DN-gels) are a new class of crosslinked polymer networks with extraordinary mechanical properties while containing 80-90 vol.% water. Small-angle neutron scattering (SANS) was applied to investigate the molecular origin of the mechanical properties observed in DN-gels. We present SANS results in both deformed and undeformed conditions for a tough DN-gel made of poly-(2-acrylamido-2-methyl-1-propane sulfonic acid) (PAMPS) and polyacrylamide (PAAm). The SANS measurements indicate that deformation of DN-gels results in periodic and mesoscale (similar to 1.5 mu m) compositional fluctuations in both PAMPS and PAAm. In addition, SANS measurements also indicate that the DN-gel constituents interact favorably with each other while in water. This favorable interaction between PAMPS and PAAm is consistent with the rheological results on solution mixtures of these two polymers. The implications of the above observations to toughening mechanisms are discussed. Published by Elsevier Ltd.

引用

页码：7449 / 7454

页数：6

共 26 条

[1]

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