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Preparation of all-cellulose composites with optical transparency using the banana pseudostem as a raw material

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Abstract

Biopolymers are intended to substitute the petroleum-based polymers and all-cellulose composite has emerged as a green alternative, especially if it can be prepared through a method consuming less energy and fewer chemicals. Here, a novel approach to obtain a nanocomposite film made of cellulose fibrils imbibed into a nanocellulose matrix is described. Banana pseudostem was used as raw material and characterized along with the resulting materials using scanning electron microscopy, optical microscopy and Raman spectroscopy, while the cellulose/nanocellulose film was studied through X-ray diffraction, UV–Vis-NIR spectroscopy and laser scanning microscopy. Results indicate that cellulose (fibrils) and nanocellulose (platelets), extracted from banana pseudostem were successfully purified using hydrolysis at a relatively low amount of chemicals. Transparent films made of a fibrils/nanoplatelets blend were prepared by the solution casting method, exhibiting a transmittance of ≈ 83–88% and a crystallinity index of ≈ 70, hence demonstrating the feasibility of this novel method to obtain cellulose/nanocellulose free-standing films.

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Abbreviations

BI-Ctrl:

Control sample

BI-Alk:

Sample under alkaline pretreatment

BI-Hyd:

Sample under acidic pretreatment

BP:

Sample under basic pretreatment

CNP:

Cellulose nanoplatelets

CrI:

Crystallinity index

XRD:

X-ray diffraction

OM:

Optic microscopy

SEM:

Scanning electron microscopy

LSM:

Laser scanning microscopy

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Correspondence to L. Chávez-Guerrero.

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Chávez-Guerrero, L., Vazquez-Rodriguez, S., Salinas-Montelongo, J.A. et al. Preparation of all-cellulose composites with optical transparency using the banana pseudostem as a raw material. Cellulose 26, 3777–3786 (2019). https://doi.org/10.1007/s10570-019-02369-1

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  • DOI: https://doi.org/10.1007/s10570-019-02369-1

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