Banca de QUALIFICAÇÃO: DANIEL ROSSI KLEIN

Uma banca de QUALIFICAÇÃO de MESTRADO foi cadastrada pelo programa.
DISCENTE : DANIEL ROSSI KLEIN
DATA : 23/11/2022
HORA: 08:30
LOCAL: Campus Feliz (defesa online)
TÍTULO:

EVALUATION OF THE EFFECT OF INCORPORATING ORGANOMODIFIED CLAYS IN POLYESTER RESIN FOR FURTHER USE IN TRICOMPONENT COMPOSITES CONTAINING RAMIE FIBER

PALAVRAS-CHAVES:

Clay. Montmorillonite. Polyester. Silane. Natural Fiber.

PÁGINAS: 35
GRANDE ÁREA: Engenharias
ÁREA: Engenharia de Materiais e Metalúrgica
SUBÁREA: Materiais Não-Metálicos
ESPECIALIDADE: Materiais Conjugados Não-Metálicos
RESUMO:

The search for materials from renewable sources, low cost and high performance that replace the materials currently used, are aligned with the increased concern about the environment. In this way, studies about preparing of polymeric composits, reinforced with natural fibers, that provide low cost, high performance and favorable to the environment are gaining prominence. The addition of fibers mainly influences the mechanical caracteristics of composites, when looking for aggregation of other properties, the addiction of nanomateriais is recommended. One of the nanomateriais most studied nanomaterials is montmorillonite clay (MMT), which provide an improvement in mechanical properties, in addiction to affecting the morfological termal properties, among others. Clays are hydrophilic in nature. In this way, the treatments on its surface are indicate, to improve its dispersion, one of the most used techniques is silanization.  In this project intends to develop polyester matrix composites molded by resin transfer technique (RTM), reinforced with ramie fiber and MMT clay, to investigate its performance against the requirements necessary for application in automotive panels.  At this first moment the behavior of the silanization in an organomodified clay was analyzed, as well as its properties in the manufacture of nanocomposites, molded using the casting technique. For this a mixture of silane (MPS) and anhydrous alcohol, were dripped into a mixture of modified organo clay and anhydrous ethanol previously mixed with the aid of a mechanical stirrer; Then the mixture of etanol and MPS was dripped together with the mixture of clay and etanol, remaining under magnetic stirring at 80 °C for 24 hr. After centrifugation, the clay was dried, crushed and sied, in a sieve with na opening of 53 µm. The preparation of nanocomposites was carried out by homogenizing the resin with 3% by weight of clay, with the aid of a mechanical stirrer, followed by an ultrasound bath to remove the bubbles. Finally the initiator was added and the resin was poured into previously prepared silicone molds. The clays were analyzed using FTIR, DRX and TGA techniques, where it was possible to confirm the silane graft in the clay. Rheological analyzes were carried out in the purê resin, and with incorporation of clay particles and, finally, FTIR, DRX, mechanics, and dynamic mechanycs, analyzes were performed, which indicated the incorporation of clay with the polyester matrix, in addition to an increase in strength in nanocomposites prepared with clay compared to pure resine.  Therefore, it is concluded that the method used promoted the silanization of the clay, in addition to demonstrating that the incorporaton of clay in a polyester matrix, promotes an improvement in its mechanical and dynamic mechanics properties. Despite the result between the nanocomposites, don't show great differences, studies demonstrate that silanes promote a better interaction between the polyester resin and natural fibers, thus justifying their use in the continuation of the project.

MEMBROS DA BANCA:
Presidente - 2383615 - DAIANE ROMANZINI
Interno - 1580090 - ANDRE ZIMMER
Externo à Instituição - ADEMIR JOSE ZATTERA - UCS