resumo
Nanocomposites of poly(glycidyl methacrylate) and bacterial cellulose (BC), or poly(poly(ethylene glycol) methacrylate) and BC were produced via the in-situ polymerization of methacrylic monomers, inside the BC 3D network. The nanocomposites surface properties were evaluated by inverse gas chromatography (IGC). The dispersive component of surface energy (gamma(d)(s)) varied between 35.64 - 83.05 mJ M-2 at 25 degrees C. The surface of the different nanocomposites has a predominant basic character (K-b/K-a = 4.20-4.31). Higher specific interactions with polar probes were found for the nanocomposite bearing pendant epoxide groups, that apart from the low surface area (S-BET = 0.83 m(2) g(-1)) and monolayer capacity (n(m) = 2.18 mu mol g(-1)), exhibits a high value of gamma(d)(s) (88.19 mJ M-2 at 20 degrees C). These results confirm the potential of IGC to differentiate between nanocomposites with different surface functional groups and to predict their potential interactions with living tissues, body fluids and other materials.
palavras-chave
CELLULOSE; NANOCELLULOSE; POLYMERIZATION; MICROSPHERES; COMPOSITES; MEMBRANES; ACID
categoria
Chemistry; Polymer Science
autores
Faria, M; Vilela, C; Silvestre, AJD; Deepa, B; Resnik, M; Freire, CSR; Cordeiro, N
nossos autores
Armando Jorge Domingues Silvestre
Professor Catedrático
Carla Vilela
Professor Auxiliar
Carmen Sofia da Rocha Freire Barros
Investigador Coordenadoragradecimentos
The authors acknowledge the National Program for Scientific Equipment Renewal, POCI 2010, for sponsoring the IGC work (FEDER and Foundation for the Science and Technology), and project CICECO - Aveiro Institute of Materials, POCI-01-0145-FEDER-007679 (FCT Ref. UID/CTM/50011/2013), financed by national funds through the FCT/MEC and when appropriate co-financed by FEDER under the PT2020 Partnership Agreement. The Portuguese Foundation for Science and Technology (FCT) is also acknowledged for the post-doctoral grant to C. Vilela (SFRH/BPD/84168/2012), and research contract under Investigador FCT to C.S.R. Freire (IF/01407/2012).