Banca de DEFESA: FERNANDO DE BRITO GLUCK

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
STUDENT : FERNANDO DE BRITO GLUCK
DATE: 10/07/2023
TIME: 13:45
LOCAL: IFRS - Campus Caxias do Sul - online
TITLE:

DETERMINATION OF THERMO-MECHANICAL PROPERTIES IN RECYCLED PLA FILAMENTS FOR 3D PRINTING

KEY WORDS:

Polylactic acid, additive manufacturing, PLA filament recycling, PLA thermomechanical properties

PAGES: 42
BIG AREA: Engenharias
AREA: Engenharia Mecânica
SUBÁREA: Processos de Fabricação
SPECIALTY: Processos de Fabricação, Seleção Econômica
SUMMARY:

In recent times, the issue of plastic recycling has become one of the leading issues of environmental protection and waste management. Polymer materials are found applied in many areas of daily life and industry. Along with their extended use, the problem of plastic waste appeared because, after withdrawal from use, they became persistent and noxious wastes. The possibility of reusing polymeric materials enables waste utilization to obtain consumable products. The 3D printing market is a well-growing sector. Printable filaments can be made from various thermoplastic materials, including those from recycling. This paper studies the thermal-mechanical properties of recycled polylactic acid (PLA) material filaments obtained from 3D-printed specimens. The analysis was first with the virgin filament (PLA N) and, subsequently, two recycling cycles (PLA 1 and PLA 2). There were thermal properties evaluations for the three processing types, as follows: differential scanning calorimetry (DSC), Fourier-transform infrared spectroscopy (FTIR), thermogravimetric analysis (TGA), and tensile test for both specimens and filaments. The glass transition temperatures (Tg) remained at their typical values. The same happened with the melting temperature (Tm). In the TGA, the PLA thermal stability remained constant. The FTIR presented the functional groups unaltered for the recycled samples. In the second filament recycling, the tensile strength decreased by 26%, and the maximum strain was 40%, compared to PLA N. The same occurred to PLA 2 specimens; the maximum stress and strain decreased by 45% and 31%, respectively. In terms of crystallinity, this presented a variation of 86% of the virgin material for the second recycling cycle, which correlated to tensile strength shows a weakness in the PLA recycled structure, decreasing the strain until the fracture and the tensile strength.

COMMITTEE MEMBERS:
Interno - 1997577 - ALEXANDRE LUIS GASPARIN
Interno - 1332290 - EDSON LUIZ FRANCISQUETTI
Externa ao Programa - 3279832 - AMANDA ALBERTIN XAVIER DA SILVA
Externo à Instituição - LEANDRO LUÍS CORSO - UCS