Thermo-mechanical and dielectric properties of graphene reinforced caprolactam cardanol based benzoxazine–epoxy nanocomposites

Abstract

In the present work a new type of benzoxazine was synthesized using caproamine with cardanol and their molecular structure was characterized by FTIR and NMR spectroscopy. The graphene reinforced epoxy-polybenzoxazine nanocomposites was prepared by incorporating varying weight percentages of graphene and benzoxazine to epoxy resin. Data obtained from mechanical study infer the significant improvement in the values of tensile strength, impact strength and flexural strength of the composites reinforced with different weight percentages of benzoxazine and graphene. The values of dielectric constant of composite samples are appreciably enhanced and are higher than that of neat epoxy matrix.Data from SEM, TEM and XRD ascertain the existence of homogeneous distribution of graphene in the composites. Data obtained from thermal, mechanical, dielectric and surface free energy studies infer that 20 wt% Bz-g reinforced composites possesses better properties than those of neat epoxy matrix and other weight percentages of composites.

Enhancement in Mechanical, Thermal, and Dielectric Properties of Functionalized Graphene Oxide Reinforced Epoxy Composites

“…The increase in dielectric values is due to the presence of the superior conductive nature of the graphene oxide, which approaches the percolation threshold, according to the percolation theory and also has a substantial effect on the migration leads to increases the charge carriers at the interface between F-GO and epoxy resin. 43,44 On the other hand, the enhancement of dielectric properties is due to free charge carriers in motion leading to the formation of continuous conductive pathway throughout the epoxy composites. Furthermore, the improvement in dielectric properties may be attributed to the increase in network density of 'micro-capacitors' in the functionalized graphene oxide epoxy composites.…”

Development and characterisation of functionalised AL‐MCM‐41 reinforced caprolactam toughened DGEBA epoxy‐cyanate ester polymer nanocomposites

“…Therefore, the lowering of dielectric loss tangent can be explained due to the formation of insulating layer outer to the dielectric centre, which thus restricted the migration and accumulation of charges within the nanocomposites. [41,42]…”

Interfacial encapsulation of bio‐based benzoxazines in epoxy shells for temperature triggered healing

“…driven to the interface, leading to the formation of cross-linked spherical shell. We adopt a "sustainable" approach for the synthesis of cardanol-based benzoxazine (Bz-C), 14,15 where the role of cardanol is extended as a reactive diluent. 16 Conventionally, liquid paraffin is used as a dispersing phase; however, the viscosity of liquid paraffin is not high enough to maintain system stability, 17 so rapid polymerization is needed to prevent the coagulation of the polymerization droplets.…”