Bio-sourced nylon 69

one of promising engineering plastics

has a great potential in developing sustainable technology and various commercial applications. Isothermal and nonisothermal crystallization kinetics of nylon 69 is a base to optimize the process conditions and establish the structure-property correlations for nylon 69

and it is also highly beneficial for successful applications of nylon products in industry. Isothermal and nonisothermal crystallization kinetics has been investigated by differential scanning calorimetry for nylon 69

bio-sourced even-odd nylon. The isothermal crystallization kinetics has been analyzed by the Avrami equation

the calculated Avrami exponent at various crystallization temperatures falls into the range of 2.28 and 2.86. In addition

the Avrami equation modified by Jeziorny and the equation suggested by Mo have been adopted to study the nonisothermal crystallization. The activation energies for isothermal and nonisothermal crystallization have also been determined. The study demonstrates that the crystallization model of nylon 69 might be a twodimensional (circular) growth at both isothermal and nonisothermal crystallization conditions. Furthermore

the value of the crystallization rate parameter (K) decreases

significantly but the crystallization half-time (t

1/2

) increases with the increase of the isothermal crystallization temperature. To nonisothermal crystallization

the crystallization rate increases as the cooling rate increases according to the analysis of Jeziorny's theory. The results of Mo's theory suggest that a faster cooling rate is required to reach a higher relative degree of crystallinity in a unit of time

and crystallization rate decreases when the relative degree of crystallinity increases at nonisothermal crystallization conditions.