Abstract
Abstract This study aimed to prepare cellulose nanofibrils (CNF) with tunable morphology and properties from wheat straw using enzyme-assisted ultrasonic treatment. The effects of different enzymatic hydrolysis duration on the morphology and the properties of the CNF were studied. The effects of different enzymatic hydrolysis duration on the morphology and the properties of the CNF were studied. AFM analysis showed that average height distribution for CNF-0 (without enzymatic pretreatment) decreased from 11.86 to 8.18 nm for CNF-4 (with the enzymatic hydrolysis duration of 4 h), while the crystallinity and water reserve value (WRV) for CNF-0 increased from 36 and 485% to 47 and 789% for CNF-4, respectively. The transmittance, wettability properties, and mechanical performances of CNF-based films were systematically studied. The results show that the film properties are highly dependent on the morphology of their corresponding CNF and can be effectively modulated by controlling the structural characteristics of CNF. The discoveries of this study provide an environment-friendly approach for the production of CNF with tunable morphology and fibril size, which can promote the production of cellulose-based nanomaterial as well as their related applications.
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