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用短切甲壳素纤维增强聚 (ε-己内酯 ) (PCL)制备出新型生物可吸收复合材料 ,通过高级流变扩展系统(ARES)对不同纤维含量 (Cf)的复合材料熔体进行了动态流变特性的研究。结果表明 :纤维含量的增加可以明显提高复合材料熔体的复数模量 (G*)和复数粘度 (η*)。当 Cf从 4 5 %增加到 5 5 %时 ,复合材料熔体在低频区出现了明显的类似于力学性能的“屈服行为”,即 G*不再随频率的改变而变化 ,同时材料的弹性 (G′)要明显高于粘性 (G″)。这种行为可能与纤维在熔体内形成刚性的粒子网络有关 ,对材料的加工成型不利。从双对数坐标下的 G′～ G″曲线和η″～ η′来看 ,纤维的加入明显提高了熔体的弹性 ,延长了熔体的主松弛时间。
New bioabsorbable composites were prepared by chopped chitin fiber-reinforced poly (ε-caprolactone) (PCL) and the composite melt with different fiber content (Cf) was subjected to high-grade rheological extension system (ARES) Study on Dynamic Rheological Properties. The results show that the complex modulus (G *) and complex viscosity (η *) of the composite melt can be obviously increased by increasing the fiber content. When the Cf increased from 45% to 55%, the composite melt showed obvious “yield behavior” similar to mechanical properties in the low frequency range, that is, G * no longer changed with the change of frequency, while the elasticity of the material (G ’) is significantly higher than the viscosity (G “) .This behavior may be related to the fiber in the melt to form a rigid network of particles, the material processing and shaping adverse.From the double logarithmic coordinates of G’ ~ G” Curve and η "~ η ’point of view, the addition of fiber significantly increased the flexibility of the melt, extending the main relaxation time of the melt.