This letter proposes a strategy to construct tunable films combining the physical characteristics of cellulose nanofibrils and smart polymers for membrane applications. A functional membrane template was obtained by first fabricating a water stable film from cellulose nanofibrils and subsequently surface grafting it with a thermoresponsive polymer, poly(N-isopropylacrylamide). The behavior of the membrane template was dependent on temperature. The slope of relative water permeance around the lower critical solution temperature of poly(N-isopropylacrylamide) increased from 18 % to 100 % upon polymer attachment. While the membrane template essentially consisted of wood-based materials, the benefits of smart synthetic polymers were achieved.
- cellulose nanofibrils
- thermoresponsive polymers
- surface modification
Hakalahti, M., Mautner, A., Johansson, L-S., Hänninen, T., Setälä, H., Kontturi, E., Bismarck, A., & Tammelin, T. (2016). Direct Interfacial Modification of Nanocellulose Films for Thermoresponsive Membrane Templates. ACS Applied Materials & Interfaces, 8(5), 2923-2927. https://doi.org/10.1021/acsami.5b12300