Thermodynamic properties and crystallization behavior of poly(p-phenylene succinate)

✍ Scribed by Ji Ho Youk; Wan Shik Ha; Won Ho Jo; Seung Wook Lee

• Publisher: John Wiley and Sons
• Year: 1999
• Tongue: English
• Weight: 137 KB
• Volume: 73
• Category: Article
• ISSN: 0021-8995
• DOI: 10.1002/(sici)1097-4628(19990801)73:5<801::aid-app20>3.0.co;2-o

✦ Synopsis

The equilibrium thermodynamic properties and crystallization behavior of poly(p-phenylene succinate) (PPSc) were examined using differential scanning calorimetry (DSC) and a wide-angle X-ray diffractometer. When PPSc quenched into liquid nitrogen, the PPSc still showed 60 J/g of the heat of fusion, indicating that PPSc crystallizes too fast to be quenched to a glassy state. The equilibrium heat of fusion (⌬H°) of PPSc and its equilibrium entropy of fusion (⌬S°) were estimated to be 28 and 48 J/mol K, respectively. The effect of the molecular weight and undercooling on PPSc crystallization was analyzed by the Avrami expression. The crystallization rate of PPSc was highest at about 276°C, regardless of molecular weight when the sample was isothermally crystallized. This temperature was higher than that of poly(ethylene terephthalate) (PET) by 100°C. The crystallization rate was highest when the number average molecular weight of PPSc was about 20,000 g/mol.