info:eu-repo/semantics/article
Diffusion and hydrolysis effects during water aging on an epoxy-anhydride system
Fecha
2018-07Registro en:
Capiel, Guillermina; Uicich, Julieta Fabienne; Fasce, Diana Patricia; Montemartini, Pablo Ezequiel; Diffusion and hydrolysis effects during water aging on an epoxy-anhydride system; Elsevier; Polymer Degradation And Stability; 153; 7-2018; 165-171
0141-3910
CONICET Digital
CONICET
Autor
Capiel, Guillermina
Uicich, Julieta Fabienne
Fasce, Diana Patricia
Montemartini, Pablo Ezequiel
Resumen
Hydrothermal aging of an epoxy-anhydride network has been studied by means of gravimetric analysis, Fourier transform infrared spectroscopy (FTIR) and modulated differential scanning calorimetry (MDSC). The long-term aging results revealed a fourth stage mechanism in which an initial short diffusional period is followed by the hydrolysis of the ester groups. Degraded materials showed two values of glass transition temperature suggesting a heterogeneous process. Hydrolysis undergoes in preferential sites due to the catalytic effect of the carboxyl acids formed during the chemical degradation. Domains with low crosslinking density and high mobility are formed. At long degradation time, samples presented a unique glass transition temperature around 50 °C. The lixiviation of low molecular weight species formed by the hydrolytic scissions was confirmed by FTIR and pH variations.