Brazilian Agro-Industrial Wastes for Potential Textile Materials: characterization and analysis of coconut ( Cocos nucifera) fiber

• Ano de defesa: 2023
• Autor(a) principal: Siqueira, Mylena Uhlig
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: eng
• Instituição de defesa: Biblioteca Digitais de Teses e Dissertações da USP
• Palavras-chave em Português: Cocos nucifera; Agro-industrial wastes; Biomaterials Design; Design biomateriais; Fibra do coco verde; Green coconut fiber; Indústria Têxtil; Resíduos Agro-industriais; Sustainability; Sustentabilidade; Textile industry
• Link de acesso: https://www.teses.usp.br/teses/disponiveis/100/100133/tde-19072023-181926/

The Brazilian agro-industrial chain generates around 291 million/tons/year of waste. The coconut tree (Cocos nucifera) plays an important economic and social role in the agroindustry of Brazil, being the 5th largest producer of the fruit in the world. The activity generates a large amount of residual bark, while its inadequate final destination causes contamination and socio-environmental risks. The need for the use of alternative raw materials to replace those originating from fossil resources in Brazilian industry is growing. The subject has gained importance in light of recent applications of bio-based agrofiber, such as coir fiber. The present study aims to investigate Brazilian agro-industrial residues as potential textile raw materials and carry out the extraction process and physical-chemical characterization of green coconut fiber (Cocos nucifera). The methodology was performed through Systematic Literature Review (SLR) and bibliometric data analysis; and textile characterization of green coconut fiber (length; count number; tensile characterization - strength and elongation at break, tenacity and Young\'s modulus; regain; transverse and longitudinal optical microscopy; SEM; density; lignin, cellulose and hemicellulose content; TGA; FTIR and XRD). The agricultural biomass of the main crops is suitable for application in textiles, such as natural fibers and polymers; bio sorbents for industrial effluents; material for obtaining and reinforcing cellulose in composites. Studies with coconut fiber apply to bio sorbent for textile effluents; craftsmanship; green composites and copolymers. The values found for in natura green coconut fibers were: length: 11.7 ± 1.5 cm; regain: 10.1%; Crystallinity index: 47.1%; tenacity: 14.4 ± 3.4 cN/tex; elongation: 45.6 ± 12.6%; YM: 0.865±0.308 N/tex; 56.0% cellulose and 37.0% lignin. For green retted coconut fibers: length: 12.3 ± 1.6 cm; regain: 11.0%; Crystallinity index: 47.5%; tenacity: 14.2 ± 3.9 cN/tex; elongation: 52.8 ± 11.7%; YM: 0.721 ± 0.280 N/tex.; 57.0% cellulose and 36.5% lignin. This study intended to expand possible sustainable alternatives to conventional textile raw materials.