Journal
CARBOHYDRATE POLYMERS
Volume 88, Issue 2, Pages 713-718Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.carbpol.2012.01.026
Keywords
Carboxylated nanocrystalline cellulose; N-Isopropyl acrylamide; Hydrogels; pH sensitive; Swelling behavior
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Carboxylated nanocrystalline cellulose (CNCC) was used as a matrix material for the preparation of N-isopropyl acrylamide-based thermal/pH sensitive hydrogels. The resulting hydrogels' structure, morphology, thermal/pH-sensitive properties, swelling behavior and mechanical properties were investigated. The results indicated that the CNCC/PNIPAAm hydrogels exhibited the pH- and temperature-sensitivity. From its stress-strain curves, the hydrogels' stiffness increased obviously from the change of yield point when the amount of CNCC was increased. Scanning electron microscopy (SEM) supported the hypothesis that the added CNCC became an integral network of the hydrogels, which is responsible for the observed thermal/pH sensitivity and the improved strength. (c) 2012 Elsevier Ltd. All rights reserved.
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