Preparation of photoreactive nanocellulosic materials: Via benzophenone grafting

Hannes Orelma; Maija Vuoriluoto; Leena Sisko Johansson; Joseph M. Campbell; Ilari Filpponen; Markus Biesalski; Orlando J. Rojas

doi:10.1039/c6ra15015b

Preparation of photoreactive nanocellulosic materials: Via benzophenone grafting

Hannes Orelma, Maija Vuoriluoto, Leena Sisko Johansson, Joseph M. Campbell, Ilari Filpponen, Markus Biesalski, Orlando J. Rojas

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Abstract

A method for preparing photo-crosslinkable cellulose nanofibrils (CNF) was investigated. Benzophenone (BP), a UV-radical crosslinker, was chemically grafted to TEMPO-oxidized wood fibers in water/DMSO medium. This resulted in a reduction of carboxyl group content together with an increase of the number density of amide linkages. The BP-functionalized fibres were then microfluidized into TEMPO-oxidized CNF (TOCNF). As evidence of the crosslinking performance, the films of BP-activated TOCNF displayed improved water resistance upon UV curing (even under high energy sonication). In addition to improving wet strength the method is suitable for further modification of CNF, either by utilizing the remaining free carboxyl groups or via photochemical grafting of other substances onto the CNF structure.

Original language	English
Pages (from-to)	85100-85106
Journal	RSC Advances
Volume	6
Issue number	88
DOIs	https://doi.org/10.1039/c6ra15015b
Publication status	Published - 1 Jan 2016
MoE publication type	A1 Journal article-refereed

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abstract = "A method for preparing photo-crosslinkable cellulose nanofibrils (CNF) was investigated. Benzophenone (BP), a UV-radical crosslinker, was chemically grafted to TEMPO-oxidized wood fibers in water/DMSO medium. This resulted in a reduction of carboxyl group content together with an increase of the number density of amide linkages. The BP-functionalized fibres were then microfluidized into TEMPO-oxidized CNF (TOCNF). As evidence of the crosslinking performance, the films of BP-activated TOCNF displayed improved water resistance upon UV curing (even under high energy sonication). In addition to improving wet strength the method is suitable for further modification of CNF, either by utilizing the remaining free carboxyl groups or via photochemical grafting of other substances onto the CNF structure.",

author = "Hannes Orelma and Maija Vuoriluoto and Johansson, {Leena Sisko} and Campbell, {Joseph M.} and Ilari Filpponen and Markus Biesalski and Rojas, {Orlando J.}",

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T1 - Preparation of photoreactive nanocellulosic materials

T2 - Via benzophenone grafting

AU - Orelma, Hannes

AU - Vuoriluoto, Maija

AU - Johansson, Leena Sisko

AU - Campbell, Joseph M.

AU - Filpponen, Ilari

AU - Biesalski, Markus

AU - Rojas, Orlando J.

PY - 2016/1/1

Y1 - 2016/1/1

N2 - A method for preparing photo-crosslinkable cellulose nanofibrils (CNF) was investigated. Benzophenone (BP), a UV-radical crosslinker, was chemically grafted to TEMPO-oxidized wood fibers in water/DMSO medium. This resulted in a reduction of carboxyl group content together with an increase of the number density of amide linkages. The BP-functionalized fibres were then microfluidized into TEMPO-oxidized CNF (TOCNF). As evidence of the crosslinking performance, the films of BP-activated TOCNF displayed improved water resistance upon UV curing (even under high energy sonication). In addition to improving wet strength the method is suitable for further modification of CNF, either by utilizing the remaining free carboxyl groups or via photochemical grafting of other substances onto the CNF structure.

AB - A method for preparing photo-crosslinkable cellulose nanofibrils (CNF) was investigated. Benzophenone (BP), a UV-radical crosslinker, was chemically grafted to TEMPO-oxidized wood fibers in water/DMSO medium. This resulted in a reduction of carboxyl group content together with an increase of the number density of amide linkages. The BP-functionalized fibres were then microfluidized into TEMPO-oxidized CNF (TOCNF). As evidence of the crosslinking performance, the films of BP-activated TOCNF displayed improved water resistance upon UV curing (even under high energy sonication). In addition to improving wet strength the method is suitable for further modification of CNF, either by utilizing the remaining free carboxyl groups or via photochemical grafting of other substances onto the CNF structure.

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Preparation of photoreactive nanocellulosic materials: Via benzophenone grafting

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