Abstract
Isothermal melt and cold crystallization kinetics of PEDEKmK linked by meta-phenyl and biphenyl were investigated by differential scanning calorimetry in two temperature regions. Avrami analysis is used to describe the primary stages of the melt and cold crystallization, with exponent nA 2 and nA 4, respectively. The activa- tion energies are 0118 kJ/mol and 510 kJ/mol for crystallization from the melt and the glassy states, respectively. The equilibrium melting point T 0 is estimated to be 3097C by using the Hoffman-Weeks approach, which compares favorably with determi- nation from the Thomson-Gibbs method. The lateral and end surface free energies derived from the Lauritzen-Hoffman spherulitic growth rate equation are s A 8.45 erg/cm 2 and seA 45.17 erg/cm 2 , respectively. The work of chain folding q is determined as 3.06 kcal/mol. These observed crystallization characteristics of PEDEKmK are com- pared with those of the other members of poly(aryl ether ketone) family. q 1997 John Wiley & Sons, Inc. J Appl Polym Sci 64: 1451-1461, 1997
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