Dynamic mechanical behavior and network structure of bisphenol-apolybenzoxazine

The dynamic mechanical behaviors of bisphenol-A polybenzoxazine based CF reinforcement were tested for researching their high temperature relaxation behavior.More than one relaxation peaks were observed in the dynamic mechanical spectra of the samples cured under different temperatures.The AFM micrograph of polybenzoxazine showed that many high modulus tight particles dispersed in the resins.The multi-relaxation behavior of bisphenol-A polybenzoxazine was related with its heterogeneity network structure.The adding of low functional benzoxazine decreased the height of α_3 relaxation peak and were favored to form more tight phase than that of bisphenol-A polybenzoxazine.