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Crystallization behavior of reactive blends between PBS and PA6IcoT / Kun Cao in Industrial & engineering chemistry research, Vol. 51 N° 15 (Avril 2012) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 51 N° 15 (Avril 2012) . - pp. 5461-5468 Titre : Crystallization behavior of reactive blends between PBS and PA6IcoT Type de document : texte imprimé Auteurs : Kun Cao, Auteur ; Qiang Wang, Auteur ; Ya-chan Zhou, Auteur Année de publication : 2012 Article en page(s) : pp. 5461-5468 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Crystallization Résumé : A biodegradable crystalline aliphatic polyester, poly(butylene succinate) (PBS), and an amorphous semiaromatic nylon, poly(hexamethylene isophthalamide-co-terephthalamide) (PA6IcoT), were melted and reactively blended with p-toluene sulfonic acid as the catalyst. The isothermal and nonisothermal crystallization processes of PBS and its blends with PA6IcoT were investigated by differential scanning calorimetry (DSC). Three different models (Jeziorny’s, Ozawa’s, and Mo et al.’s methods) were used to simulate the isothermal and nonisothermal crystallization kinetics. Moreover, the crystalline morphologies were observed by polarized optical microscopy. The effects of PA6IcoT and the ester–amide exchange reaction between polyester and polyamide on the crystallization processes and crystalline morphology are described in detail. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=25815824 [article] Crystallization behavior of reactive blends between PBS and PA6IcoT [texte imprimé] / Kun Cao, Auteur ; Qiang Wang, Auteur ; Ya-chan Zhou, Auteur . - 2012 . - pp. 5461-5468. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 15 (Avril 2012) . - pp. 5461-5468 Mots-clés : Crystallization Résumé : A biodegradable crystalline aliphatic polyester, poly(butylene succinate) (PBS), and an amorphous semiaromatic nylon, poly(hexamethylene isophthalamide-co-terephthalamide) (PA6IcoT), were melted and reactively blended with p-toluene sulfonic acid as the catalyst. The isothermal and nonisothermal crystallization processes of PBS and its blends with PA6IcoT were investigated by differential scanning calorimetry (DSC). Three different models (Jeziorny’s, Ozawa’s, and Mo et al.’s methods) were used to simulate the isothermal and nonisothermal crystallization kinetics. Moreover, the crystalline morphologies were observed by polarized optical microscopy. The effects of PA6IcoT and the ester–amide exchange reaction between polyester and polyamide on the crystallization processes and crystalline morphology are described in detail. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=25815824

Kinetic study on surface modification of ammonium polyphosphate with melamine / Kun Cao in Industrial & engineering chemistry research, Vol. 50 N° 14 (Juillet 2011) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 50 N° 14 (Juillet 2011) . - pp. 8402-8406 Titre : Kinetic study on surface modification of ammonium polyphosphate with melamine Type de document : texte imprimé Auteurs : Kun Cao, Auteur ; Shui-Liang Wu, Auteur ; Kai - Li Wang, Auteur Année de publication : 2011 Article en page(s) : pp. 8402-8406 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Kinetics Résumé : Ammonium polyphosphate (APP) and melamine (MEL) are two typical components of halogen-free intumescent flame retardants. Surface modification of APP with MEL is one solution to overcome the weak water resistance and low compatibility with polymeric materials of APP, in addition to adjusting the ratio between phosphorus and nitrogen elements. This work is focused on the kinetics of the reaction between APP and MEL. The amount of ammonia released during reaction, the grafting ratio, and the grafting efficiency were determined by elemental analysis and FTIR spectroscopy. A kinetics model was developed to quantify the reaction process. The kinetic parameters were estimated from the experimental data. It was found that the apparent reaction orders with respect to APP and MEL are 1 and 2, respectively. The frequency factor and activation energy of this reaction were determined to be 9.29 x 104 s―1 and 75.9 kJ/mol. Simulation results obtained by this model fit the experimental data well. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=24346880 [article] Kinetic study on surface modification of ammonium polyphosphate with melamine [texte imprimé] / Kun Cao, Auteur ; Shui-Liang Wu, Auteur ; Kai - Li Wang, Auteur . - 2011 . - pp. 8402-8406. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 50 N° 14 (Juillet 2011) . - pp. 8402-8406 Mots-clés : Kinetics Résumé : Ammonium polyphosphate (APP) and melamine (MEL) are two typical components of halogen-free intumescent flame retardants. Surface modification of APP with MEL is one solution to overcome the weak water resistance and low compatibility with polymeric materials of APP, in addition to adjusting the ratio between phosphorus and nitrogen elements. This work is focused on the kinetics of the reaction between APP and MEL. The amount of ammonia released during reaction, the grafting ratio, and the grafting efficiency were determined by elemental analysis and FTIR spectroscopy. A kinetics model was developed to quantify the reaction process. The kinetic parameters were estimated from the experimental data. It was found that the apparent reaction orders with respect to APP and MEL are 1 and 2, respectively. The frequency factor and activation energy of this reaction were determined to be 9.29 x 104 s―1 and 75.9 kJ/mol. Simulation results obtained by this model fit the experimental data well. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=24346880