| Abstract: | ![]()
Analysis of isothermal and nonisothermal crystallization kinetics of nylon 66 was carried out using differentialscanning calorimetry (DSC). The commonly used Avrami equation and that modified by Jeziorny were used, respectively, tofit the primary stage of isothermal and nonisothermal crystallizations of nylon 66, In the isothermal crystallization process,mechanisms of spherulitic nucleation and growth were discussed. The lateral and folding surface free energies determinedfrom the Lauritzen-Hoffman treatment are σ=9.77 erg/cm2 and σe=155.48 erg/cm2,respectively;and the work of chain folding is q=33.14 kJ/mol.The nonisothermal crystallization kinetics of nylon 66 was analyzed by using the Mo methof combined with the Avrami and Ozawa equations.The average Avrami exponent ? was determined to be 3.45.The activation energies(△E) were determined to be -485.45 kJ/mol -331.27 kJ/mol,respectively,for the isothermal and nonisothermal crystallization processes by the Arrhenius and the Kissinger methods. |
