Journal
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
Volume 346, Issue 1-3, Pages 91-98Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.colsurfa.2009.05.031
Keywords
Mechanical strength; Interpenetrating network hydrogel; Two-step method; Toughness; Tensile strength
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Funding
- National Natural Science Foundation of China [50572030, 50842027]
- Key Science Technology Program by the Ministry of Education, China [206074]
- Chinese Higher Education [20060385001]
- National High Technology Research and Development Program of China (863 Program) [SQ2008AA03Z2470974]
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Hydrogels have potential applications in many fields, but the poor mechanical strength has limited their further development. In this article, we designed a high-strength hydrogel with an interpenetrating network (IPN) structure from polyacrylamide (PAM) and poly(vinyl alcohol) (PVA). Synthesis parameters, Such as PVA/AM mass ratio, crosslinker dosage and elongation time were carried out for high tensile strength and elongation. The results showed that chemical crosslinking, physical entanglement and PVA precipitates were the dominant parameters for the improvement of mechanical properties. The PVA structure transferred from crystal to amorphous due to intermolecular and intramolecular interactions (such as hydrogen bond and self-crosslinking). PVA precipitates scatterred in the brittle PAM matrix homogeneously which dispersed the applied stress and improved the hydrogel toughness. The tensile strength and elongation were extremely high, they were 2.4 MPa and 3100%, respectively. The simple method is versatile in synthesizing high-strength IPN hydrogels using many kinds of polymer species. (C) 2009 Elsevier B.V. All rights reserved.
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