Journal
POLIMEROS-CIENCIA E TECNOLOGIA
Volume 31, Issue 2, Pages -Publisher
ASSOC BRASIL POLIMEROS
DOI: 10.1590/0104-1428.09620
Keywords
biopolymers; bleaching; nanotechnology; chemical process; lignocellulosic biomass
Categories
Funding
- Coordenacao de Aperfeicoamento de Pessoal de Nivel Superior Brasil (CAPES) [001]
- Centro de Microscopia Eletronica at the Universidade Federal do Parana (UFPR)
- [FINEP/CT-INFRA/3080/20112011]
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This study successfully extracted nanofibrillated cellulose (NFC) from yacon stems using chemical pulping and bleaching processes, resulting in a suspension with high crystallinity index and thermal stability.
This study aimed to evaluate the process of cellulose extraction from yacon stem using combined pulping and bleaching processes to produce nanofibrillated cellulose (NFC). First, a chemical pulping process with NaOH was applied and, subsequently, the pulp obtained was bleached. From the chemical pulp (CP) bleached, NFC was obtained by the mechanical defibrillation in a colloidal grinder. Then, chemical composition, and infrared analysis of the pulps were performed. The pulping process showed a lower amount of extractives and lignin content, as a low yield and an excessively dark pulp. The CP bleached with NaClO2 showed the best results increased whiteness of the pulp. A suspension of NFC with fibers of 5-60 nm in diameter, high crystallinity index, and thermal stability was obtained. The results are promising and demonstrate the technical feasibility of obtaining NFC from yacon stems waste which is ideal to apply to other materials of the industry.
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