Journal
CARBOHYDRATE POLYMERS
Volume 189, Issue -, Pages 169-177Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.carbpol.2018.02.031
Keywords
Natural fibers; Fique fibers; Fique tow; Cellulose nanofibrils (CNF); Ultrasound-assisted TEMPO
Categories
Funding
- COLCIENCIAS [567/2012]
- Universidad Industrial de Santander Vice-chancellor for Research Office [2316/2017]
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Fique fibers are extracted from Furcraea spp. leaves, with 5% average mass yield, using mechanical decortication. Juice, pulp and tow, the by-products of this process, amount 95% of the leaf weight and are considered waste. We extracted cellulose nanofibrils (CNF) from Fique tow, via ultrasound-assisted TEMPO followed by mechanical disintegration with sonication. Fique CNF exhibit diameters around 100 nm, degree of oxidation (DO) of 0.27 and surface charge density (sigma) of 1.6 mmol/g. Fique CNF aqueous suspensions show optical bi-refringence and high colloidal stability due to a high zeta potential (-53 mV). The morphology, chemical structure, crystallinity and phase transitions of Fique CNF were studied using FESEM, IR-ATR, XRD and TGA. We observed that the delignification pretreatment and the TEMPO reaction assisted by ultrasound significantly increase Fique CNF s and. potential, in contrast with the oxidation carried out without ultrasound or with raw (lignified) tow.
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