DYNAMIC RHEOLOGICAL BEHAVIORS OF THE BIOABSORBABLE CHITIN FIBER REINFORCED PCL COMPOSITE

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 C_f obviously enhanced the complex modulus and complex viscosity. And when C_f 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.