Synthesis, characterization and viscoelastic properties of nanocrystalline cellulose grafted with poly(N-isopropylacrylamide)

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Proceedings titleNanotechnology 2012: Technical Proceedings of the 2012 NSTI Nanotechnology Conference and Expo. Volume 1: Advanced materials, CNTs, particles, films and composites
ConferenceNanotech Conference and Expo 2012, June 18-21, 2012, Santa Clara, CA, USA
Pages640643; # of pages: 4
SubjectFunctionalizations; Functionalized; Living radical polymerization; Lower critical solution temperature; N-isopropylacrylamides; Nanocrystalline cellulose; Polymer chains; Polymer grafting; Resulting materials; Rheometry; Stable systems; Thermoresponsive polymer; Viscoelastic properties; Viscosity value; Acrylic monomers; Cellulose derivatives; Grafting (chemical); Living polymerization; Polymers; Rheology; Shear viscosity; Thermodynamic properties; Viscoelasticity; Nanocomposite films; Copolymerization; Low Temperature; Polyacrylics; Thin Films
AbstractNanocrystalline cellulose (NCC) was grafted with the thermo-responsive polymer poly(N-isopropylacrylamide) (Nipaam) via living radical polymerization. Various techniques were used to characterize the physical, chemical, morphological and thermal properties of the resulting material. The viscoelastic properties and the stability of the functionalized NCC were compared to the unmodified NCC using rheometry. The shear viscosity of the NCC suspension decreased slightly with an increase in temperature from 20°C to 45°C, indicating a stable system. The storage modulus and shear viscosity values both exhibited a burst increase at about 32.5°C, which is assigned to be the lower critical solution temperature (LCST) of poly(Nipaam). This indicates the successful functionalization of Nipaam polymer chains on NCC. In addition, the thermodynamic property of poly(Nipaam) also prevailed on the grafted NCC.
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AffiliationNational Research Council Canada (NRC-CNRC); Aquatic and Crop Resource Development; Security and Disruptive Technologies
Peer reviewedYes
NPARC number21270286
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Record identifier927d8c4c-3486-4ac6-b6e4-6e55e41498e8
Record created2014-01-20
Record modified2016-05-09
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