纳米氧化铝粒子—聚酯—环氧树脂复合体系内应力的研究

研究了未改性环氧树脂体系及聚酯复合纳米氧化铝粒子改性环氧树脂的三元体系在固化及冷却过程中内应力的变化，研究结果表明，环氧树脂体系中的内应力主要产生于冷却过程中，随纳米粒子加入量的增加，三元体系弹性模量线性增大，其体积收缩率逐渐减小，而增大体系的弹性模量或增大体系的体积收缩率均使三元体系的内应力增加，在聚酯复合纳米氧化铝粒子改性环氧树脂的三元体系中，当纳米粒子加入量为8g时，三元体系的弹性模量和体积收缩率达到最佳组合，此时三元体系的内应力最小，相应的动态力学分析显示，三元体系的贮能模量大于未改性环氧树脂体系的贮能模量。

Internal Stress of Nano-Alumina-Polyester-Epoxy Resin Ternary System

Nano alumina particles polyester epoxy resin ternary systems were prepared by a melting blend process. The internal stresses of both the modified and the unmodified epoxy resins were measured by the steel ring method during the curing and cooling periods. The results showed that the internal stress due to cooling for cured resin was almost absent during the curing period. With the increase in nanoparticles, the elastic modulus increased linearly and the percentage of bulk shrinkage decreased gradually, both of which could either raise or laver the internal stress of the ternary system. The minimum value of the internal stress corresponds to an addition of 8 g of nano particles. A dynamic mechanics analysis (DMA) indicated that the flexural storage modulus of ternary system was greater than that of the unmodified epoxy resin.