Enhancing an Aerospace Grade Benzoxazine Resin by Means of Graphene Nanoplatelets Addition

• Published in: Polymers Vol. 13; no. 15; p. 2544
• Main Authors: García-Martínez, Vanessa, Gude, Maria R., Calvo, Silvia, Ureña, Alejandro
• Format: Journal Article
• Language: English
• Published: Basel MDPI AG 31.07.2021; MDPI
• Subjects: Aerospace engineering; Aircraft industry; Benzoxazines; Calendering; Carbon; Conductivity; Curing; Electric currents; electrical and thermal conductivity; Electrical resistivity; Elongation; Epoxy resins; Graphene; Heat conductivity; Heat resistance; Heat transfer; Mechanical properties; Microscopy; Moisture absorption; Nanocomposites; Polymers; Resins; Sensors; Tensile strength; Thermal conductivity; Thermomechanical properties
• ISSN: 2073-4360; 2073-4360
• DOI: 10.3390/polym13152544

Two different contents of graphene nanoplatelets (GNPs: 0.5 and 2 wt.%) were introduced into benzoxazine resin. The main objective of this work is to obtain a polymeric nanocomposite with multifunctional properties as high electrical and thermal conductivity, maintaining or improving its mechanical performance. The quality of the dispersion, performed with a three-roll calender, was studied. Afterward, a complete characterization of the nanocomposites was carried out in order to analyse the benefits of neat resin. The main features of the nanocomposites such as the mechanical and thermo-mechanical properties, their electrical and thermal conductivity and the behaviour under hygrothermal aging, were evaluated. Results allowed us to confirm that benzoxazine/GNPs composites exhibited an increase in the tensile strength of polymeric matrix which was accompanied by a rise in elongation at break. The electrical and thermal conductivities exhibited a remarkable increment with the addition of 2 wt.% of GNPs (six orders of magnitude and 49% respectively). Finally, the barrier properties of benzoxazine resin were also favoured with the presence of GNPs because the maximum water absorbed in a hot-water environment decreased from 2.52% to 2.14% when 0.5 wt.% of graphene nanoplatelets was added.