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Preparation of cellulose nanofibers from Miscanthus x. Giganteus by ammonium persulfate oxidation

Author:
Yang, Han, Zhang, Yefei, Kato, Ryo, Rowan, Stuart J.
Source:
Carbohydrate polymers 2019
ISSN:
0144-8617
Subject:
Miscanthus, acid hydrolysis, ammonium persulfate, bleaching agents, carboxylic acids, cellulose, cellulose nanofibers, crystal structure, dispersibility, grasses, mechanical properties, nanocrystals, oxidation, polyvinyl acetate, storage modulus, thermal stability, thermogravimetry, ultrasonic treatment
Abstract:
Carboxylic acid functionalized cellulose nanofibers (MxG-CNFA-CO2H) were successfully isolated from a sustainable grass hybrid Miscanthus x. Giganteus by a new two-step chemical oxidation, that involves bleach treatment and ammonium persulfate oxidation, followed by ultrasonication. The resulting MxG-CNFA-CO2Hs have ca. 1200mmol/kg carboxylic acid surface groups, an aspect ratio of 230 (height of ca. 3.8±0.8nm and length of ca. 880±300nm) and 70% crystallinity. Interestingly, these MxG-CNFA-CO2Hs exhibit better thermal stability (as measured by thermal gravimetric analysis) and better dispersibility in DMF than corresponding cellulose nanocrystals (CNC) obtained from same biosource (MxG-CNC-CO2Hs) via acid hydrolysis. Poly(vinyl acetate):MxG-CNFA-CO2H composites show an increase in storage modulus (aboveTg) with increasing filler content. Importantly, the mechanical properties of the poly(vinyl acetate):nanocellulose composites showed that the MxG-CNFA-CO2Hs exhibit significantly better reinforcement than the MxG-CNC-CO2H at the same weight percent filler content.
Agid:
6309199