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Lopez De Vergara U.,Gaiker 4 Research Center | Lopez De Vergara U.,University of Mondragon | Sarrionandia M.,University of Mondragon | Gondra K.,Gaiker 4 Research Center | Aurrekoetxea J.,University of Mondragon
Composites Part B: Engineering | Year: 2014

Basalt fibre reinforced furan composites were successfully manufactured by microwave technology. The samples were tested under instrumented falling weight impact loading and compared with conventionally cured ones. The microwave cured composites present higher values for ILLS (13.1%), delamination threshold force (5.2%), maximum load (17.8%) and penetration threshold (14.5%). The better impact performance of microwave curing composites is suggested to be due to its lower residual stresses and more homogeneous crosslinking induced by mass volumetric heating. © 2014 Elsevier Ltd. All rights reserved. Source


Lopez De Vergara U.,Gaiker 4 Research Center | Lopez De Vergara U.,University of Mondragon | Sarrionandia M.,University of Mondragon | Gondra K.,Gaiker 4 Research Center | Aurrekoetxea J.,University of Mondragon
Thermochimica Acta | Year: 2014

The challenge of this work is the microwave curing study of low free-furfuryl alcohol content furan resins. The chemical characterization of the furan resins has been made by infrared spectroscopy and nuclear magnetic resonance spectroscopy. The chemical composition of the resin and its reactions with p-toluensulfonic acid are proposed, with the aim of understanding the mechanism responsible for the main reactions. The results show the presence of methyl and ether bridges between the furan rings, and the formation of ketone and conjugated structures. Furthermore, the curing kinetics of the furan resins has been characterized by differential scanning calorimetry. Different methods have been applied in order to obtain and compare the activation energy of the process. Vyazovkin numerical analysis was found the most accurate method. Finally, microwave and conventional curing processes has been compared. The analysis showed that microwave curing of furan resins was twice faster than thermal curing. © 2014 Elsevier B.V. Source

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