双酚A型聚苯并噁嗪的动态力学行为与交联网络结构

Dynamic mechanical behavior and network structure of bisphenol-apolybenzoxazine

以碳纤维为增强体，在较宽的温度范围内（50～350℃），对不同固化条件下的双酚A型聚苯并噁嗪进行动态力学分析（DMA），研究其高温松弛行为。tan占温度谱上多个峰的出现，表明双酚A型聚苯并噁嗪有多重高温松弛行为。原子力显微镜用来研究聚苯并噁嗪浇注体弯曲断面的微观形貌，结果表明：双酚A型聚苯并噁嗪的交联网络为非均相结构，高模量的“致密相”分散在低模量的“疏松相”中。聚苯并噁嗪的多重松弛行为与其微观非均相结构相关。低官能度苯并噁嗪的加入有利于化学交联的高模量致密相的形成，使聚合物的α3松弛峰高降低。

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 a3 relaxation peak and were favored to form more “tight” phase than that of bisphenol-A polybenzoxazine.