Effect of Alkaline Treatment and Graphene Oxide Coating on Thermal and Chemical Properties of Hemp (Cannabis Sativa L.) Fibers

• Published in: Journal of natural fibers Vol. 19; no. 15; pp. 12168 - 12181
• Main Authors: da Silveira, Pedro Henrique P. M., Ribeiro, Matheus P., Silva, Thuane T., Lima, Andreza M., Lemos, Maurício F., Oliveira, Anthony G. B. A. M., Nascimento, Lucio Fabio C., Gomes, Alaelson V., Monteiro, Sérgio N.
• Format: Journal Article
• Language: English
• Published: Abingdon Taylor & Francis 23-11-2022; Taylor & Francis Ltd; Taylor & Francis Group
• Subjects: alkaline treatment; Calorimetry; Cannabis; cannabis sativa L; Chemical properties; Coated fibers; Coating effects; Coatings; Crystallinity; Differential scanning calorimetry; Fibers; Fourier transforms; Glass transition temperature; GO coating; Graphene; graphene-oxide; Heat treatment; Hemp; hemp fibers; Infrared spectroscopy; Lignocellulose; natural lignocellulosic fibers; Oxide coatings; Raman spectra; Raman spectroscopy; Scanning electron microscopy; Sodium hydroxide; Spectrum analysis; Thermal stability; Thermogravimetric analysis; Transition temperatures; X-ray diffraction; 动态力学特性; 橄榄纤维; 热机械性能; 热稳定性; 环氧复合材料
• ISSN: 1544-0478; 1544-046X
• DOI: 10.1080/15440478.2022.2053265

The constant concern about environmental issues has led to the growth of researches about eco-friendly materials. Among them, the natural lignocellulosic fibers have already presented their potential in place of petroleum-based synthetics. However, a relevant number of studies still have to deal with their disadvantages, such as the weak bond on the matrices for a composite performance and limited thermal performance. Thus, the present study analyzes a combination of alkaline treatment and graphene oxide coating in hemp fibers, an NLF applied in several products but with few investigations in engineering applications. The hemp fibers were thermally characterized with thermogravimetric analysis (TGA) and differential scanning calorimetry (DSC). The GO-coating was evidenced by the Fourier transform infrared spectroscopy (FTIR) and Raman spectroscopy. Changes in crystallinity were presented by X-ray diffraction (XRD). It was observed an increase of about 4% to 11% of the crystallinity after the alkaline treatment. The thermal stability rose about 13°C in the 10 wt% NaOH-treated and GO-coated fibers, and a change of about 3.5°C was detected for the glass transition temperature. The GO-coating effect was also evidenced by changes in Raman spectra and FTIR curves and was visually detected in the scanning electron microscope (SEM).