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Nonisothermal and isothermal cold crystallization behaviors of biodegradable poly(p-dioxanone) / Jian-Bing Zeng in Industrial & engineering chemistry research, Vol. 50 N° 8 (Avril 2011) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 50 N° 8 (Avril 2011) . - pp. 4471–4477 Titre : Nonisothermal and isothermal cold crystallization behaviors of biodegradable poly(p-dioxanone) Type de document : texte imprimé Auteurs : Jian-Bing Zeng, Auteur ; Madhusudhan Srinivansan, Auteur ; Shao-Long Li, Auteur Année de publication : 2011 Article en page(s) : pp. 4471–4477 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Nonisothermal  Isothermal  Crystallization  Biodegradable Résumé : Nonisothermal and isothermal cold crystallization behaviors of poly(p-dioxanone) (PPDO) were investigated by differential scanning calorimetry (DSC). There were two crystallization exotherms—a major exotherm between 25 °C and 50 °C and a minor one almost unchanged at 77 °C with various heating rates—in the heating scans of PPDO during nonisothermal cold crystallization. Temperature-modulated differential scanning calorimetry (TMDSC) revealed the major crystallization exotherm in the low-temperature range to be the real cold crystallization peak, and the minor one in the high-temperature range to be the melt-recrystallization peak of crystals with lower thermal stability. Several methods, including the Avrami, Tobin, and Ozawa equations, were employed to analyze the nonisothermal cold crystallization kinetics of PPDO. The efficiencies of the Avrami and Tobin methods were compared, and the results suggest that the Avrami equation is more suitable for describing nonisothermal cold crystallization kinetics of PPDO. The activation energy for nonisothermal cold crystallization of PPDO was calculated to be 35.27 kJ/mol, using the Kissinger method. In addition, the Avrami equation was also used to describe the isothermal cold crystallization kinetics of PPDO. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie102299y [article] Nonisothermal and isothermal cold crystallization behaviors of biodegradable poly(p-dioxanone) [texte imprimé] / Jian-Bing Zeng, Auteur ; Madhusudhan Srinivansan, Auteur ; Shao-Long Li, Auteur . - 2011 . - pp. 4471–4477. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 50 N° 8 (Avril 2011) . - pp. 4471–4477 Mots-clés : Nonisothermal  Isothermal  Crystallization  Biodegradable Résumé : Nonisothermal and isothermal cold crystallization behaviors of poly(p-dioxanone) (PPDO) were investigated by differential scanning calorimetry (DSC). There were two crystallization exotherms—a major exotherm between 25 °C and 50 °C and a minor one almost unchanged at 77 °C with various heating rates—in the heating scans of PPDO during nonisothermal cold crystallization. Temperature-modulated differential scanning calorimetry (TMDSC) revealed the major crystallization exotherm in the low-temperature range to be the real cold crystallization peak, and the minor one in the high-temperature range to be the melt-recrystallization peak of crystals with lower thermal stability. Several methods, including the Avrami, Tobin, and Ozawa equations, were employed to analyze the nonisothermal cold crystallization kinetics of PPDO. The efficiencies of the Avrami and Tobin methods were compared, and the results suggest that the Avrami equation is more suitable for describing nonisothermal cold crystallization kinetics of PPDO. The activation energy for nonisothermal cold crystallization of PPDO was calculated to be 35.27 kJ/mol, using the Kissinger method. In addition, the Avrami equation was also used to describe the isothermal cold crystallization kinetics of PPDO. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie102299y