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Alkylation of mixed micro- and nanocellulose to improve dispersion in polylactide

Title
Alkylation of mixed micro- and nanocellulose to improve dispersion in polylactide
Author
김성훈
Keywords
nanocellulose; alkylation; alkyl ether cellulose; biocomposite; polylactide
Issue Date
2015-06
Publisher
WILEY-BLACKWELL
Citation
POLYMER INTERNATIONAL, v. 64, NO 6, Page. 821-827
Abstract
Nanocellulose tends to be aggregated due to the hydrogen bonding between three of the hydroxyl groups in each repeat unit, resulting in poor dispersion in non-polar polymer matrices. In this research, to improve the dispersion of cellulose particles in a polymer matrix, a long hydrophobic alkyl chain was substituted for hydrogen in the hydroxyl group of cellulose via a bimolecular nucleophilic substitution (S(N)2) reaction with alkyl bromide. Octyl (C8H17) and dodecyl (C12H25) groups were applied in this reaction, which is faster and simpler than other substitution reactions. The chemical structures of octyl and dodecyl ether cellulose were identified using Fourier transform infrared and NMR analyses. The contact angle with water and methylene iodide was measured to calculate the surface energy of alkyl nanocellulose. The surface energy was decreased by the substituted alkyl chain. The thermal properties, morphology and crystal structure of octyl and dodecyl ether cellulose were also investigated to determine the possibility of use as a reinforcement. Furthermore, polylactide/alkyl ether cellulose composites were prepared to make certain of sufficient dispersion of the alkyl ether cellulose in the polylactide matrix. The thermal and mechanical properties of the polylactide composite films were investigated. The optical transmittance of the polylactide composites was measured to confirm the relative dispersity. (c) 2014 Society of Chemical Industry
URI
http://onlinelibrary.wiley.com/doi/10.1002/pi.4858/fullhttp://hdl.handle.net/20.500.11754/25307
ISSN
0959-8103; 1097-0126
DOI
10.1002/pi.4858
Appears in Collections:
COLLEGE OF ENGINEERING[S](공과대학) > ORGANIC AND NANO ENGINEERING(유기나노공학과) > Articles
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