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Poly(N-vinylcaprolactam) nanocomposites containing nanocrystalline cellulose: a green approach to thermoresponsive hydrogels |
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| Authors: | Roberta Sanna Elena Fortunati Valeria Alzari Daniele Nuvoli Andrea Terenzi Maria Francesca Casula Josè Maria Kenny Alberto Mariani |
| Institution: | 1. Department of Chemistry and Pharmacy, Local INSTM Unit, University of Sassari, Via Vienna 2, 07100, Sassari, Italy 2. Materials Engineering Center, UdR INSTM, University of Perugia, Str. Pentima 4, 05100, Terni, Italy 3. Department of Chemical and Geological Sciences, Local INSTM Unit, University of Cagliari, Campus of Monserrato, s.p. no. 8?km 0.700, 09042, Monserrato, Italy |
| Abstract: | In this work, we report on the synthesis and characterization of thermoresponsive poly(N-vinylcaprolactam), PNVCL, nanocomposite hydrogels containing nanocrystalline cellulose (CNC) by the use of frontal polymerization technique, which is a convenient, easy and low energy-consuming method of macromolecular synthesis. CNC was obtained by acid hydrolysis of commercial microcrystalline cellulose and dispersed in dimethylsulfoxide. The dispersion was characterized by TEM analysis and mixed with suitable amounts of N-vinylcaprolactam for the synthesis of PNVCL nanocomposite hydrogels having a CNC concentration ranging between 0.20 and 2.0 wt%. The nanocomposite hydrogels were analyzed by SEM and their swelling and rheological features were investigated. It was found that CNC decreases the swelling ratio even at small concentration. The rheological properties of the hydrogels indicated that CNC strongly influenced the viscoelastic modulus, even at concentrations as low as 0.1 wt%: both G′ and G″, and the viscosity increase with CNC content, indicating that the nanocellulose has a great potential to reinforce PNVCL polymer hydrogels. |
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