Crystallization behavior of a novel poly(aryl ether ketone): PEDEKmK

✍ Scribed by Tianxi Liu; Zhishen Mo; Shanger Wang; Hongfang Zhang; Junzuo Wang; Hui Na; Zhongwen Wu

• Publisher: John Wiley and Sons
• Year: 1997
• Tongue: English
• Weight: 247 KB
• Volume: 64
• Category: Article
• ISSN: 0021-8995
• DOI: 10.1002/(sici)1097-4628(19970523)64:8<1451::aid-app1>3.0.co;2-g

✦ Synopsis

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 n Å 2 and n Å 4, respectively. The activation 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 m is estimated to be 309ЊC by using the Hoffman-Weeks approach, which compares favorably with determination from the Thomson-Gibbs method. The lateral and end surface free energies derived from the Lauritzen-Hoffman spherulitic growth rate equation are s Å 8.45 erg/cm 2 and s e Å 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 compared with those of the other members of poly(aryl ether ketone) family.