摘要:
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45%增加到55%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。
Abstract:
A novel bioabsorbable composite was prepared from chitin fiber reinforced PCL matrix, and the ARES was used to study the dynamic rheological behaviors of the composite melts. The increase of Cf obviously enhanced the complex modulus and complex viscosity. And when Cf was increased from 45% to 55%, the G* curve showed the obvious'yielding behavior' like the mechanical properties, that was to say, the G* had no variation with the change of frequency in a wide range. Moreover, the elasticity (G') was over that of viscidity, which might be contributed to the formation of the 'network of fiber particle', and might result in a disadvantage for processing. For the G '~G″ plots and η″~η',the reinforcement of fiber increased the elasticity, prolonged the mail relaxation time, and widened the relaxation spectrum of the melts.
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