Desenvolvimento de filamentos de celulose microfibrilada com gomas xantana e guar

• Ano de defesa: 2022
• Autor(a) principal: Menini, Poliana Dariva
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Federal do Espírito Santo; BR; Mestrado em Engenharia Química; Centro de Ciências Agrárias e Engenharias; UFES; Programa de Pós-Graduação em Engenharia Química
• Palavras-chave em Português: Filamentos de celulose microfibrilada; Goma xantana; Goma guar; Fiação úmida; subject.br-rjbn; Engenharia Química
• Link de acesso: http://repositorio.ufes.br/handle/10/16943

Cellulose-based materials have been widely used in several sectors and, among these materials, the cellulose microfibril (CFM) has been gaining more and more space. The application of CFM in the production of textile filaments still requires a lot of research, given the challenge that is its coagulation process, therefore, scholars have increasingly sought to find materials that help this process when worked together with the CFM. Therefore, the objective of this work was to develop a methodology for spinning in acetone to make filaments using MFC and gums (xanthan and guar). Three configurations of filaments were made, monocomponent, bicomponent and mixed bicomponent, with the filaments with xanthan gum tested in three different coagulation times, 90, 120 and 150 seconds and with guar gum in the time of 120 seconds. The wires were analyzed using scanning electron microscopy (SEM), X-ray diffraction (XRD), thermogravimetric analysis (TG) and derived thermogravimetry (DTG), Fourier transform infrared spectroscopy (FTIR), water absorption and mechanical resistance. The analysis of the morphology of the filaments showed the importance of the gums on the outer part of the filaments, presenting in the bicomponent configurations (BI) a more circular area and with less stress concentrators. In addition, the bicomponent filaments showed the highest mechanical resistance, both for the yarns with xanthan gum (27.97 MPa) and for the yarns with guar gum (28.69 MPa), both results obtained after 120 seconds of coagulation. The water absorption of the threads showed an eminent potential for the application of absorbent materials, being able to replace absorbents derived from synthetic polymers, being an excellent ecological alternative.