Evaluation of Out-of-Autoclave (OOA) epoxy system

AUTOR(ES)

Guilherme, Fernanda, Cassu, Silvana Navarro, Diniz, Milton Faria, Leal, Tanila Penteado de Faria Gonzales, Sanches, Natália Beck, Dutra, Rita de Cássia Lazzarini

FONTE

Polímeros

DATA DE PUBLICAÇÃO

2017-12

RESUMO

Abstract Epoxy resins (EP) usually cure in autoclave to minimize resin voids and to achieve the desired resin/fiber ratio. Cure parameters such as temperature, vacuum and pressure levels are controlled and monitored. Aiming time and cost optimization, new out-of-autoclave (OOA) cure processes have been developed lately. This study evaluated the cure cycle and the effect of non-programmed interruptions in an OOA process. Fourier Transform Infrared spectroscopy (FT-IR) results show similarities between the resin used and diglycidyl ether of bisphenol A (DGEBA) and also that the curing system is composed of cyan and sulfur hardeners, codified in industry, as Components of #2511 Resin System. The cure cycle and its interruptions were simulated by dynamic-mechanical analysis (DMA). The samples obtained were evaluated by FT-IR and differential scanning calorimetry (DSC), whose results show that the degree of cure varying between 0.8 to 0.85 was achieved at 120 °C.

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