Development of Bio-based Polybenzoxazine Composite Post : Effect of Glass Fiber Content on Mechanical Properties and Fracture Behaviors

Abstract

This work aims to develop a novel composite post based on bio-based polybenzoxazine reinforced with glass fiber. The bio-based polybenzoxazine (poly(V-fa)) derived from vanillin, furfurylamine and paraformaldehyde, was prepared as polymer matrix in this study. Mechanical property and thermal property influenced by glass fiber contents were evaluated. The numerical simulation was also used to study the response to external applied load of tooth restored with glass fiber-reinforced poly(V-fa) composite posts by finite element analysis. From the results, not only the flexural properties, i.e. flexural strength and flexural modulus, were substantially improved up to 460 MPa and 25.6 GPa, respectively, but thermal properties, i.e. glass transition temperature (Tg) and degradation temperature at 5wt% loss (Td5), of the composites were also enhanced with the reinforcement of glass fiber contents. Furthermore, the restoration of the developed glass fiber-reinforced poly(V-fa) composite post in term of the maximum von Mises stress and deformation areas was predicted via ANSYS program. The experimental and numerical results revealed that the bio-based polybenzoxazine composite reinforced with glass fiber have highly potential to be used as composite posts.