title: Hydrophilicity improvement of mercerized bacterial cellulose films by polyethylene glycol graft.
abstract: In this work, polyethylene glycol (PEG), of tree distinct molar masses (200, 300 and 400 g mol(-1)), was grafted onto mercerized bacterial nanocellulose (BNCm) and applied to produce nanofilms (BNCm-PEG). The products BNCm-PEG were characterized by NMR and thermal analysis. Solid-state NMR and X-ray diffraction analyses exhibited no significant differences in index of BNCm-PEG derivatives compared to BNCm, indicating that grafting reaction did not modify the BNCm crystalline structure. The apparent contact angle of the films showed that BNCm-PEG films exhibited a pronounced increase in the polar components (BNCm: 8.1 mN m(-1) vs BNCm-PEG400: 29.4 mN m(-1)), and a decrease in dispersive components (BNCm: 41.7 mN m(-1) vs BNCm-PEG400: 35.2 mN m(-1)) of the surface free energy. The BNCm-PEG films were more hydrophilic than BNCm and retained the biocompatibility with L929 fibroblast cells culture.
authors: BioPol, Chemistry Department, Federal University of Paraná, P.O. Box 19081, Polytechnic Centre, 81531-980, Curitiba, Brazil.
authors: Renata
authors: R
authors: da Silva
authors: BioPol, Chemistry Department, Federal University of Paraná, P.O. Box 19081, Polytechnic Centre, 81531-980, Curitiba, Brazil.
authors: Maria R
authors: MR
authors: Sierakowski
authors: BioPol, Chemistry Department, Federal University of Paraná, P.O. Box 19081, Polytechnic Centre, 81531-980, Curitiba, Brazil.
authors: Helen P
authors: HP
authors: Bassani
authors: Synthetic Polymers Laboratory, Chemistry Department, Federal University of Paraná, P.O. Box 19081, Polytechnic Centre, 81531-980, Curitiba, Brazil.
authors: Sônia F
authors: SF
authors: Zawadzki
authors: BioPol, Chemistry Department, Federal University of Paraná, P.O. Box 19081, Polytechnic Centre, 81531-980, Curitiba, Brazil.
authors: Cleverton L
authors: CL
authors: Pirich
authors: Yasuyoshi Hayashi Laboratory, Pathology Department, Federal University of Paraná, P.O. Box 19081, Polytechnic Centre, 81531-990, Curitiba, Brazil.
authors: Lucy
authors: L
authors: Ono
authors: BioPol, Chemistry Department, Federal University of Paraná, P.O. Box 19081, Polytechnic Centre, 81531-980, Curitiba, Brazil. Electronic address: rilton@quimica.ufpr.br.
authors: Rilton A
authors: RA
authors: de Freitas
mesh_terms: D000818:Animals; D001419:Bacteria / Q000737:chemistry*; D002460:Cell Line; D002482:Cellulose / Q000737:chemistry*; D057927:Hydrophobic and Hydrophilic Interactions; D008422:Materials Testing; D051379:Mice; D008970:Molecular Weight; D049329:Nanostructures / Q000737:chemistry; D011092:Polyethylene Glycols / Q000737:chemistry*; D058105:Polymerization
chemical_list: D011092:Polyethylene Glycols; D002482:Cellulose
keywords: Bacterial cellulose; Grafting polyethylene glycol; Hydrophilic films