Documents disponibles écrits par cet auteur

Rheology, crystallization, and biodegradability of blends based on soy protein and chemically modified poly(butylene succinate) / Yi-Dong Li in Industrial & engineering chemistry research, Vol. 48 N° 10 (Mai 2009) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 48 N° 10 (Mai 2009) . - pp. 4817–4825 Titre : Rheology, crystallization, and biodegradability of blends based on soy protein and chemically modified poly(butylene succinate) Type de document : texte imprimé Auteurs : Yi-Dong Li, Auteur ; Jian-Bing Zeng, Auteur ; Wen-Da Li, Auteur Année de publication : 2009 Article en page(s) : pp. 4817–4825 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : PBS  blends  Soy  protein  Crystallization  Biodegradability  Rheology Résumé : In our previous study, we found that modification of poly(butylene succinate) (PBS) by introducing urethane and isocyanate groups is an effective method for improving the mechanical properties and water resistance of soy-protein-based bioplastics. This study presents the effects of the structure and content of PBS components on the rheology, crystallization, and biodegradability of soy protein/PBS blends. Tests using a Haake torque rheometer and a high-pressure capillary rheometer both indicated that chemically modified PBS with a relatively low molecular weight can improve the flowability of the blend. According to differential scanning calorimeter measurements, the crystallization ability of the PBS component in a blend with improved compatibility is enhanced markedly compared with that of the pure PBS, and the nonisothermal crystallization behavior could be described by the Jeziorny model. A combination of the weight losses of the samples with the characterization of the surface microstructure shows that both the structure and the content of PBS influence the biodegradation rate of the blend in a compost medium. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie801718f [article] Rheology, crystallization, and biodegradability of blends based on soy protein and chemically modified poly(butylene succinate) [texte imprimé] / Yi-Dong Li, Auteur ; Jian-Bing Zeng, Auteur ; Wen-Da Li, Auteur . - 2009 . - pp. 4817–4825. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 48 N° 10 (Mai 2009) . - pp. 4817–4825 Mots-clés : PBS  blends  Soy  protein  Crystallization  Biodegradability  Rheology Résumé : In our previous study, we found that modification of poly(butylene succinate) (PBS) by introducing urethane and isocyanate groups is an effective method for improving the mechanical properties and water resistance of soy-protein-based bioplastics. This study presents the effects of the structure and content of PBS components on the rheology, crystallization, and biodegradability of soy protein/PBS blends. Tests using a Haake torque rheometer and a high-pressure capillary rheometer both indicated that chemically modified PBS with a relatively low molecular weight can improve the flowability of the blend. According to differential scanning calorimeter measurements, the crystallization ability of the PBS component in a blend with improved compatibility is enhanced markedly compared with that of the pure PBS, and the nonisothermal crystallization behavior could be described by the Jeziorny model. A combination of the weight losses of the samples with the characterization of the surface microstructure shows that both the structure and the content of PBS influence the biodegradation rate of the blend in a compost medium. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie801718f

Synthesis and properties of poly(ester urethane)s consisting of poly(l-lactic acid) and poly(ethylene succinate) segments / Jian-Bing Zeng in Industrial & engineering chemistry research, Vol. 48 N°4 (Février 2009) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 48 N°4 (Février 2009) . - pp. 1706–1711 Titre : Synthesis and properties of poly(ester urethane)s consisting of poly(l-lactic acid) and poly(ethylene succinate) segments Type de document : texte imprimé Auteurs : Jian-Bing Zeng, Auteur ; Yi-Dong Li, Auteur ; Wen-Da Li, Auteur Année de publication : 2009 Article en page(s) : pp. 1706–1711 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : Poly(ester  urethane)  Chain-extension  reaction  Poly(l-lactic  acid)  Poly(ethylene  succinate)  Polymerization Résumé : An aliphatic polyester based poly(ester urethane) (PEU) consisting of poly(l-lactic acid) and poly(ethylene succinate) was successfully prepared via chain-extension reaction of poly(l-lactic acid)-diol (PLLA-OH) and poly(ethylene succinate)-diol (PES-OH) using 1,6-hexamethlyene diisocyanate (HDI) as a chain extender. PLLA-OH was obtained by direct polycondensation of l-lactic acid in the presence of 1,4-butanediol. PES-OH was synthesized by condensation polymerization of succinic acid with excessive ethylene glycol. The structures and molecular weights of PLLA-OH, PES-OH, and PEUs were characterized by proton nuclear magnetic resonance (1H NMR), Fourier transform infrared (FTIR), and gel permeation chromatography (GPC). The PEUs were further studied by the means of thermogravimetric analysis (TGA), differential scanning calorimetry (DSC), and tensile testing. The data of GPC analysis indicated that high molecular weights for example more than 200 000 g·mol−1 were easily synthesized through chain-extension reaction. The PEUs synthesized with high molecular weight and excellent tensile properties could find some applications in biomaterials and environmental friendly materials. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie801391m [article] Synthesis and properties of poly(ester urethane)s consisting of poly(l-lactic acid) and poly(ethylene succinate) segments [texte imprimé] / Jian-Bing Zeng, Auteur ; Yi-Dong Li, Auteur ; Wen-Da Li, Auteur . - 2009 . - pp. 1706–1711. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 48 N°4 (Février 2009) . - pp. 1706–1711 Mots-clés : Poly(ester  urethane)  Chain-extension  reaction  Poly(l-lactic  acid)  Poly(ethylene  succinate)  Polymerization Résumé : An aliphatic polyester based poly(ester urethane) (PEU) consisting of poly(l-lactic acid) and poly(ethylene succinate) was successfully prepared via chain-extension reaction of poly(l-lactic acid)-diol (PLLA-OH) and poly(ethylene succinate)-diol (PES-OH) using 1,6-hexamethlyene diisocyanate (HDI) as a chain extender. PLLA-OH was obtained by direct polycondensation of l-lactic acid in the presence of 1,4-butanediol. PES-OH was synthesized by condensation polymerization of succinic acid with excessive ethylene glycol. The structures and molecular weights of PLLA-OH, PES-OH, and PEUs were characterized by proton nuclear magnetic resonance (1H NMR), Fourier transform infrared (FTIR), and gel permeation chromatography (GPC). The PEUs were further studied by the means of thermogravimetric analysis (TGA), differential scanning calorimetry (DSC), and tensile testing. The data of GPC analysis indicated that high molecular weights for example more than 200 000 g·mol−1 were easily synthesized through chain-extension reaction. The PEUs synthesized with high molecular weight and excellent tensile properties could find some applications in biomaterials and environmental friendly materials. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie801391m