Polímeros: Ciência e Tecnologia
http://revistapolimeros.org.br/doi/10.1590/0104-1428.16016
Polímeros: Ciência e Tecnologia
Original Article

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

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

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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.

Keywords

DMA, DSC, epoxy system, FT-IR, OOA.

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