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A novel aromatic - aliphatic copolyester of poly (ethylene - co - diethylene terephthalate) - co - poly (l-lactic acid) / Jun Li in Industrial & engineering chemistry research, Vol. 49 N° 20 (Octobre 2010) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 49 N° 20 (Octobre 2010) . - pp. 9803–9810 Titre : A novel aromatic - aliphatic copolyester of poly (ethylene - co - diethylene terephthalate) - co - poly (l-lactic acid) : Synthesis and characterization Type de document : texte imprimé Auteurs : Jun Li, Auteur ; Zhi-Qiang Jiang, Auteur ; Jian Zhou, Auteur Année de publication : 2011 Article en page(s) : pp. 9803–9810 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Copolyester Résumé : Aromatic−aliphatic copolyesters of poly(ethylene-co-diethylene terephthalate)-co-poly(l-lactic acid) (PEDLT) with different compositions were synthesized by direct melt copolyesterization of l-lactic acid oligomers and poly(ethylene-co-diethylene terephthalate) (PEDT) oligomers. Chemical structures, thermal properties, and crystalline behaviors were studied. 1H NMR confirmed that the short lactyl units were incorporated into the PEDT chains. Thermogravimetric analysis showed that PEDLT copolyesters were thermally stable up to about 380 °C. Both wide-angle X-ray diffraction and Fourier transform infrared spectroscopy showed that no poly(l-lactic acid) crystal was formed during the crystallization of PEDLT copolyesters. Isothermal crystallization of PEDLT copolyesters was carried out, and it was found that both the crystallinity and crystal growth rate decreased after incorporation of lactyl units compared with those of PEDT. The obtained aromatic−aliphatic copolyesters are expected to find a potential application as biodegradable polymer materials. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie100915y [article] A novel aromatic - aliphatic copolyester of poly (ethylene - co - diethylene terephthalate) - co - poly (l-lactic acid) : Synthesis and characterization [texte imprimé] / Jun Li, Auteur ; Zhi-Qiang Jiang, Auteur ; Jian Zhou, Auteur . - 2011 . - pp. 9803–9810. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 49 N° 20 (Octobre 2010) . - pp. 9803–9810 Mots-clés : Copolyester Résumé : Aromatic−aliphatic copolyesters of poly(ethylene-co-diethylene terephthalate)-co-poly(l-lactic acid) (PEDLT) with different compositions were synthesized by direct melt copolyesterization of l-lactic acid oligomers and poly(ethylene-co-diethylene terephthalate) (PEDT) oligomers. Chemical structures, thermal properties, and crystalline behaviors were studied. 1H NMR confirmed that the short lactyl units were incorporated into the PEDT chains. Thermogravimetric analysis showed that PEDLT copolyesters were thermally stable up to about 380 °C. Both wide-angle X-ray diffraction and Fourier transform infrared spectroscopy showed that no poly(l-lactic acid) crystal was formed during the crystallization of PEDLT copolyesters. Isothermal crystallization of PEDLT copolyesters was carried out, and it was found that both the crystallinity and crystal growth rate decreased after incorporation of lactyl units compared with those of PEDT. The obtained aromatic−aliphatic copolyesters are expected to find a potential application as biodegradable polymer materials. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie100915y