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Séminaire Chimie ED459 / Chaire Total

Graft modification of crystalline nanocellulose (CNC) via living radical polymerization

Prof. Michael F. Cunningham (Department of Chemical Engineering, Queen’s University, Kingston, Ontario, Canada | prof. invité Chaire Total Balard)

publié le

Le Jeudi 12 novembre 2015 à 13h45
UM FdS, Salle de cours SC-16.01

Crystalline nanocellulose (CNC) has received increasing attention in recent years due to its unique properties and potential applications in a broad range of industries. CNC has extraordinary mechanical properties and high surface area which are desirable for nanocomposite applications. However, the hydrophilicity of CNC hinders its dispersion in nonpolar polymers as well as organic solvents. Therefore, it is necessary to modify the CNC surface properties to enhance its compatibility with organic media and nonpolar polymers. The functionalization of CNC using polymer chains, compared to small molecules, might be more versatile since both polymer chain density and length can be adjusted during the functionalization process. We have employed living radical polymerization to graft polymer onto the CNC surface. We have also modified the CNC surface to make it CO2-switchable, using either amidine or tertiary amine groups which are CO2 responsive through the formation of biocarbonate salt upon exposure to CO2. The amidine and tertiary amine modified CNC can be readily dispersed into aqueous media under CO2 atmosphere while bubbling argon into the dispersion gives rise to the formation of aggregated CNC.

Contact Local ICGM : Dr. Julien Pinaud (équipe IAM)


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