Banca de DEFESA: CAROLINY MINELY DA SILVA SANTOS

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
DISCENTE : CAROLINY MINELY DA SILVA SANTOS
DATA : 28/02/2019
HORA: 09:00
LOCAL: a definir
TÍTULO:

EXTRACTION AND CHARACTERIZATION OF PAPAYA TREE FIBERS.

PALAVRAS-CHAVES:

Vegetables Fibers, Papaya Tree, Properties, Extraction Process, Bast.

PÁGINAS: 87
GRANDE ÁREA: Engenharias
ÁREA: Engenharia Química
SUBÁREA: Tecnologia Química
ESPECIALIDADE: Têxteis
RESUMO:

The present dissertation studied the extraction and characterization of the papaya tree fibers, as well as the influence of the location, size of the papaya stem sample and the percentage of fibers extracted by two extraction methods. After that, the physical-mechanical and chemical properties of the extracted fibers were analyzed and evaluated. In both processes, all the fibers presented cellulose type 1, characteristic of the vegetable fibers, demonstrating that there was no chemical modification of the fibers even when they were submitted to the physicochemical process. The properties of tensile strength were excellents for the fibers obtained by the physico-chemical process (tenacity 25 cN / tex and stretching 1.5% region 2 of the stem), since it allows to control the main variables of the process, thus there is greater performance of the fibers obtained and greater reproducibility of these results. Consequently, it is also in this process that the fibers are more superficially uniform, hydrophilic (contact angle 78.2 ° region 2 of the bast) and with higher crystallinity (65.2% region 1 of the bast). The biological process, in turn, produces fibers with more residues on the surface, with low density (0.64 g / cm 3 region 3 of the bast), with good hydrophobicity (contact angle 98 ° region 3 of the bast) and obtained two times more yield of extracted fibers (14.5% region 2 of the bast) when compared to the physical-chemical process. These results show that from the bast region of the papaya tree, the size of the sample and the type of extraction process (biological and physico-chemical), it is possible to obtain vegetable fibers with higher extractive yield and varied properties. In this way, it favors a greater applicability of papaya tree fibers.

MEMBROS DA BANCA:
Presidente - 1481705 - SALETE MARTINS ALVES
Interno - 2052404 - FERNANDO RIBEIRO OLIVEIRA
Externo ao Programa - 3217842 - MARCOS SILVA DE AQUINO
Externa à Instituição - DANIELA BECKER - EDESC