Cellulose microfibrils from banana farming residues: isolation and characterization

Springer Science and Business Media LLC - Tập 14 - Trang 585-592 - 2007
Robin Zuluaga1,2, Jean-Luc Putaux3, Adriana Restrepo1, Iñaki Mondragon4, Piedad Gañán1
1New Materials Research Group, Universidad Pontificia Bolivariana, Medellín, Colombia
2Agro-industrial Engineering Programme, Universidad Pontificia Bolivariana, Medellín, Colombia
3Centre de Recherches sur les Macromolécules Végétales (CERMAV-CNRS), Université Joseph Fourier and member of the Institut de Chimie Moléculaire de Grenoble, Grenoble cedex 9, France
4“Materials+Technologies” Group, Chemical and Environmental Engineering Department, Polytechnic School, Universidad del País Vasco/Euskal Herriko Unibertsitatea, Donostia-San Sebastián, Spain

Tóm tắt

Cellulose microfibrils have been prepared from banana rachis using a combination of chemical and mechanical treatments. The morphology and structure of the samples were characterized using transmission electron microscopy, atomic force microscopy, and X-ray diffraction. Fourier-transformed infrared spectroscopy (FTIR) was used to characterize the chemical modifications of the samples after each treatment. Suspensions of bundled or individualized 5-nm-wide microfibrils were obtained after homogenization (PH) whereas an organosolv (PO) treatment resulted in shorter aggregates of parallel cellulose microcrystallites. The sharper rings in the X-ray diffraction pattern of the PO-treated sample suggest a higher crystallinity due to a more efficient removal of hemicelluloses and dissolution of amorphous zones by the acid treatment. Both microfibrils and microcrystals prepared by both methods can be used as reinforcing filler in nanocomposite materials.

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