Surface-Modified Cellulose Nanofibers-graft-poly(lactic acid)s Made by Ring-Opening Polymerization of l-Lactide

Highly crystalline cellulose nanofibers with a high density of carboxylate groups only on the surfaces were prepared from both softwood and non-wood cellulose pulp. The preparation method used 2,2,6,6-tetramethylpiperidine-1-oxyl (TEMPO)-mediated oxidation of native cellulose fibrils in an aqueous T...

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Bibliographic Details
Published in:Journal of polymers and the environment 2019-04, Vol.27 (4), p.847-861
Main Authors: Chuensangjun, Chaniga, Kanomata, Kyohei, Kitaoka, Takuya, Chisti, Yusuf, Sirisansaneeyakul, Sarote
Format: Article
Language:English
Subjects:
Acetic acid
CELLULOSE
Cellulose fibers
Cellulose pulp
Chemistry
Chemistry and Materials Science
Crystal structure
Crystalline cellulose
Crystallinity
Crystallites
Crystals
Environmental Chemistry
Environmental Engineering/Biotechnology
Fibrils
Grafting
Industrial Chemistry/Chemical Engineering
MATERIALS SCIENCE
NANOCOMPOSITES
NANOFIBERS
NANOSCIENCE AND NANOTECHNOLOGY
Original Paper
Oxidation
Polylactic acid
Polymer Sciences
POLYMERIZATION
Pulp
Ring opening polymerization
Softwoods
Thermal properties
THERMODYNAMIC PROPERTIES
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Summary:Highly crystalline cellulose nanofibers with a high density of carboxylate groups only on the surfaces were prepared from both softwood and non-wood cellulose pulp. The preparation method used 2,2,6,6-tetramethylpiperidine-1-oxyl (TEMPO)-mediated oxidation of native cellulose fibrils in an aqueous TEMPO/NaBr/NaClO system and subsequent postoxidation with NaClO 2 in acetate buffer (pH 4.8). The TEMPO-oxidized cellulose nanofibers (TOCNs) possessed a carboxylate content of 1.7 mmol g −1 and a crystallinity of 67–69% with a crystallite size of ∼3 nm. The TOCNs were used to produce highly crystalline TOCN- graft -poly(lactic acid) (PLA) nanocomposites via ring-opening polymerization of l -lactide in a polar aprotic solvent. Effects of the reaction temperature and the molar ratio of l -lactide to carboxylate surface groups, on the efficiency of surface grafting were investigated to potentially improve the crystallinity and thermal properties of the nanocomposites. The crystallinity of TOCN- g -PLA products was 59–66% greater than the crystallinity of neat PLA.
ISSN:1566-2543
1572-8919
DOI:10.1007/s10924-019-01398-y