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(Referência obtida automaticamente do Web of Science, por meio da informação sobre o financiamento pela FAPESP e o número do processo correspondente, incluída na publicação pelos autores.)

Creep behavior of polyetherimide semipreg and epoxy prepreg composites: Structure vs. property relationship

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Autor(es):
Reis, Ana Karoline dos [1] ; Monticelli, Francisco Maciel [1] ; Neves, Roberta Motta [2] ; de Paula Santos, Luis Felipe [1] ; Botelho, Edson Cocchieri [1] ; Luiz Ornaghi Jr, Heitor
Número total de Autores: 6
Afiliação do(s) autor(es):
[1] Sao Paulo State Univ Unesp, Sch Engn, Dept Mat & Technol, Sao Paulo, SP - Brazil
[2] Univ Fed Rio Grande do Sul, Postgrad Program Min Met & Mat Engn PPGE3M, Porto Alegre, RS - Brazil
Número total de Afiliações: 2
Tipo de documento: Artigo Científico
Fonte: JOURNAL OF COMPOSITE MATERIALS; MAY 2020.
Citações Web of Science: 0
Resumo

In the present study, the creep behavior of polyetherimide semipreg and epoxy prepreg composites was studied using dynamic mechanical analyzer and focused on structure vs. property relationships in glassy, glass transition, and elastomeric regions. The main contribution to the field is to study pre-impregnated materials concerning creep behavior, mainly based on different analytical models, and microstructure. Two different reinforcements were used (carbon fiber and glass fiber) for each matrix. Findley, Burger, and Weibull analytical models were applied with an excellent fit for the most of them. The impregnation quality, verified by C-scan and the void content by acid digestion, shows different impregnation behaviors, mainly for epoxy/CF, which also influenced molecular motion behavior. The creep behavior was mainly influenced by matrix type than reinforcement architecture and void content. In addition, the creep was higher for epoxy in the glassy region; however, in the glass transition region, higher deformation was found for polyetherimide composites. Previous behavior is mainly attributed to higher energy storage in the glassy region which plays a significant role in the dissipation (glass transition energy), resulting in the energy loss or the drop of storage modulus in a narrow temperature range - more abrupt. This behavior was corroborated by time-temperature superposition curves in which the low deformation obtained for polyetherimide composites at low temperatures is maintained only until the glass transition temperature. Epoxy composites showed a higher initial creep deformation, but the values were almost constant with temperature, even when the temperature passes by the glass transition temperature. (AU)

Processo FAPESP: 18/07867-3 - Processamento e caracterização de compósitos termoplásticos multifuncionais reforçados com fibras de carbono e buckypaper de nanotubos de carbono
Beneficiário:Luis Felipe de Paula Santos
Linha de fomento: Bolsas no Brasil - Doutorado
Processo FAPESP: 17/10606-4 - Fadiga em compósitos híbridos processados via RTM: influência da interface híbrida na delaminação nos modos I e II
Beneficiário:Francisco Maciel Monticeli
Linha de fomento: Bolsas no Brasil - Doutorado
Processo FAPESP: 17/16970-0 - Obtenção e caracterização de compósitos termoplásticos nanoestruturados para aplicação aeronáutica
Beneficiário:Edson Cocchieri Botelho
Linha de fomento: Auxílio à Pesquisa - Regular