Journal
JOURNAL OF COLLOID AND INTERFACE SCIENCE
Volume 353, Issue 1, Pages 116-123Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcis.2010.09.035
Keywords
Cellulose nanocrystals; Polyacrylamide; Hydrogels; Nanocomposite; Rheology; Storage modulus; Compression strength
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Funding
- Louisiana Board of Regents Industrial [LEQSF(2010-13)-RD-B-01]
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Rod-shaped cellulose nanocrystals (CNCs) were manufactured and used to reinforce polyacrylamide (PAM) hydrogels through in situ free-radical polymerization. The gelation process of the nanocomposite hydrogels was monitored on a rheometer using oscillatory shear. The chemical structure, morphology, swelling property, and compression strength of the formed gels were investigated. A possible mechanism for forming hydrogels was proposed. The results showed that CNCs accelerated the formation of hydrogels and increased the effective crosslink density of hydrogels. Thus CNCs were not only a reinforcing agent for hydrogel, but also acted as a multifunctional cross-linker for gelation. The shear storage modulus, compression strength and elastic modulus of the nanocomposite hydrogels were significantly improved because of good dispersion of CNCs in PAM as well as enhanced interfacial interaction between these two components. Among the CNC contents used, a loading of 6.7 w/w% led to the maximum mechanical properties for nanocomposite hydrogels. (C) 2010 Elsevier Inc. All rights reserved.
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