The Interfacial And Flexible Properties Of Glass Fiber And Electrospinning Nanofibers Reinforced Dental Resin Composites

Glass fibers were surface treated with polymethylmethacrylate (PMMA) acetone solutions by various concentrations and PAN-PMMA nanofibers were fabricated by a single-nozzle co-electrospinning technique, both of which were used for reinforcing dental resin. Firstly, the flexible and viscosity properties of dental resin system with different diluter contents were studied. Then, the amount of PMMA on glass fiber, surface nature of glass fibers and micro-structures of PAN-PMMA nanofibers were investigated. Finally, the interfacial and flexible properties of the treated glass fiber and electrospinning nanofiber reinforced dental resin composites were in research.The results showed that the contents of diluter have a great effect on the final viscosity and flexible properties of dental rein system. PMMA polymer adhered to the glass fiber surface. The amount of PMMA on glass fiber surface increased with the concentration of PMMA solution. PMMA was adhered closely to the surface of glass fiber, and the fibers were dispersible after treated with2wt%and5wt%of PMMA solutions. The flexural strength and flexural modulus of treated glass fiber/dental resin composites increased by29.6%and30%after being treated with5wt%PMMA solution. PMMA on glass fiber surface is played an important role in improving interfacial properties of glass fiber/dental resin composites by forming Semi-interpenetrating Polymer network (Semi-ipn) structure.PAN-PMMA nanofiber fabricated by electrospinning technique presented a PAN core-PMMA shell structure. The PMMA located in the shell can partly be dissolved into dental resin and after photopolymerization, liner PMMA chains interpenetrate and entangle with the cross linked dental resin network to create an in situ nano-interface in the shell structure with strong interfacial adhesion between nanofibers and matrix. Consequently, the composites present signal phase morphology. For the PAN-PMMA nanofiber composites, the SF, EY and WOF values continuously increased before the mass fraction of the nanofiber increased to7.5%.Compared with the neat resin, the SF, EY and WOF of the composites reinforced with7.5%mass fraction of PAN/PMMA nanofibers increased by18.7%,14.1%and64.8%, respectively.