Improving Accessibility and Reactivity of Celluloses of Annual Plants for the Synthesis of Methylcellulose |
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Authors: | Daiyong?Ye Email author" target="_blank">Xavier?FarriolEmail author |
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Institution: | 1.Chemical Engineering Department,Rovira i Virgili University,Tarragona,Spain |
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Abstract: | Pretreatments (water-soaking, pre-mercerization, mercerization under a pressure of 15 bars and steam explosion) were used
to improve the accessibilities and reactivities of celluloses of bleached flax, hemp, sisal, abaca and jute pulps for the
synthesis of methylcellulose. Degrees of crystallinity were determined by X-ray Diffraction (XRD) spectra. The iodine adsorption
accessibilities of pulps were low and accessible fractions ranged from 1.3 to 5.2%. Accessible fractions in amorphous cellulose
were calculated in the 5–18% range. The accessibilities of these pulps were hemp pulp > flax pulp > sisal pulp > jute pulp > abaca
pulp. Fourier Transform Infrared (FTIR) spectra showed that mean hydrogen bond strengths were weakened and relative crystallinity
indexes were decreased by pretreatments. The accessibility and reactivity of the abaca pulp were improved by water soaking,
mercerization under 15 bars pressure, steam explosion and preliminary mercerization, of which steam explosion and pre-mercerization
were the best treatments. Species was the main factor for the accessibility and reactivity. |
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Keywords: | Abaca Accessibility Flax Hemp Jute Methylcellulose Pretreatments Reactivity Sisal |
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