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Polymer Grafting Inside Wood Cellulose Fibers by Improved Hydroxyl Accessibility from Fiber Swelling
journal contribution
posted on 2019-12-06, 23:44 authored by Peter Olsén, Natalia Herrera, Lars A. BerglundChemical modification of wood cellulose fibers is important
for
tailored wood–polymer interfaces, reduced moisture sorption,
and novel grades of chemical wood pulp. The present study shows how
the reaction solvent system influences hydroxyl accessibility during
chemical fiber modification. Surface initiated ring-opening polymerization
of ε-caprolactone from wood cellulose fibers was investigated
in a wide range of solvent systems. The hydrogen bond donor strength
of the solvent increased graft density and the amount of grafted polycaprolactone
(PCL) on the fiber surface, and on nanoscale fibrils inside the fiber.
Specifically, the reaction system with acetic acid as a new, green
solvent for cellulose grafting increased graft density 24 times compared
to bulk polymerization conditions. The results show relationships
between solvent properties, hydroxyl accessibility, and grafting results
in cellulosic plant fibers. The study clarifies the opportunities
provided by controlling the interior of the cellulosic plant fiber
cell wall during chemical modification so that the fiber becomes a
swollen cellulose nanofibril gel.
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Wood Cellulose Fibersmoisture sorptiongraft density 24 timeschemical modificationacetic acidPolymer Graftingcellulosic plant fibersPCLbulk polymerization conditionsring-opening polymerizationchemical wood pulpChemical modificationreaction systemnovel gradeschemical fiber modificationgraft densityHydroxyl Accessibilityhydrogen bond donor strengthcellulose nanofibril gelresults show relationshipswood cellulose fibersfiber surfacecellulosic plant fiber cell wallhydroxyl accessibilityε- caprolactonenanoscale fibrilssystem influences hydroxyl accessib...
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