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Isothermal Crystallization Behavior of Biodegradable P(BS-b-PEGS) Multiblock Copolymers / Xi Lu in Industrial & engineering chemistry research, Vol. 51 N° 24 (Juin 2012) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 51 N° 24 (Juin 2012) . - pp. 8262-8272 Titre : Isothermal Crystallization Behavior of Biodegradable P(BS-b-PEGS) Multiblock Copolymers Type de document : texte imprimé Auteurs : Xi Lu, Auteur ; Jian-Bing Zeng, Auteur ; Cai-Li Huang, Auteur Année de publication : 2012 Article en page(s) : pp. 8262-8272 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Crystallization Résumé : Biodegradable multiblock copolymers poly(butylene succinate-b-poly(ethylene glycol) succinate) (P(BS-b-PEGS)) were prepared by direct polycondensation. The thermal and crystallization behavior of P(BS-b-PEGS) with weight fraction of PEGS component from 6 to 26 wt % were comparatively investigated with those of neat poly(butylene succinate) (PBS) by wide-angle X-ray diffraction (WAXD), differential scanning calorimetry (DSC), and polarized optical microscopy (POM). P(BS-b-PEGS) showed the same crystal structure as neat PBS, but the degree of crystallinity of copolymers was lower than that of neat PBS and decreased with increase in PEGS content The isothermal crystallization kinetics study suggests that incorporation of PEGS component did not change the crystallization mechanism, but reduced the crystallization rate of the samples, and that increasing crystallization temperature decreased the crystallization rate of all the samples. The spherulites of neat PBS and P(BS-b-PEGS) showed banded morphologies. The spherulitic growth rate of the samples also decreased with increase of PEGS content and crystallization temperature. A transition from crystallization regime II to III occurred for all the samples, and the transition shifted to lower temperatures with increase in PEGS content. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=26029661 [article] Isothermal Crystallization Behavior of Biodegradable P(BS-b-PEGS) Multiblock Copolymers [texte imprimé] / Xi Lu, Auteur ; Jian-Bing Zeng, Auteur ; Cai-Li Huang, Auteur . - 2012 . - pp. 8262-8272. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 24 (Juin 2012) . - pp. 8262-8272 Mots-clés : Crystallization Résumé : Biodegradable multiblock copolymers poly(butylene succinate-b-poly(ethylene glycol) succinate) (P(BS-b-PEGS)) were prepared by direct polycondensation. The thermal and crystallization behavior of P(BS-b-PEGS) with weight fraction of PEGS component from 6 to 26 wt % were comparatively investigated with those of neat poly(butylene succinate) (PBS) by wide-angle X-ray diffraction (WAXD), differential scanning calorimetry (DSC), and polarized optical microscopy (POM). P(BS-b-PEGS) showed the same crystal structure as neat PBS, but the degree of crystallinity of copolymers was lower than that of neat PBS and decreased with increase in PEGS content The isothermal crystallization kinetics study suggests that incorporation of PEGS component did not change the crystallization mechanism, but reduced the crystallization rate of the samples, and that increasing crystallization temperature decreased the crystallization rate of all the samples. The spherulites of neat PBS and P(BS-b-PEGS) showed banded morphologies. The spherulitic growth rate of the samples also decreased with increase of PEGS content and crystallization temperature. A transition from crystallization regime II to III occurred for all the samples, and the transition shifted to lower temperatures with increase in PEGS content. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=26029661

Synthesis and properties of biodegradable poly (butylene succinate - co - diethylene glycol succinate) copolymers / Jian-Bing Zeng in Industrial & engineering chemistry research, Vol. 51 N° 38 (Septembre 2012) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 51 N° 38 (Septembre 2012) . - pp. 12258–12265 Titre : Synthesis and properties of biodegradable poly (butylene succinate - co - diethylene glycol succinate) copolymers Type de document : texte imprimé Auteurs : Jian-Bing Zeng, Auteur ; Cai-Li Huang, Auteur ; Ling Jiao, Auteur Année de publication : 2012 Article en page(s) : pp. 12258–12265 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Properties  biodegradable Résumé : Diethylene glycol was incorporated into poly(butylene succinate) (PBS) to form biodegradable poly(butylene succinate-co-diethylene glycol succinate) (P(BS-co-DEGS)) copolymer through a two-step procedure of esterification and polycondensation from succinic acid with 1,4-butanediol and diethylene glycol. The chemical structure of P(BS-co-DEGS) was confirmed by proton nuclear magnetic resonance spectroscopy (1H NMR). The effect of incorporated DEGS content on the molecular weight, thermal properties, crystallization behaviors, and hydrophilicity of the copolymers was investigated by gel permeation chromatography (GPC), differential scanning calorimetry (DSC), wide-angle X-ray diffraction (WAXD), thermogravimetry analysis (TGA), and water contact angle. The mechanical properties and hydrolytic degradation behaviors of P(BS-co-DEGS) were also studied. The results suggest that with an increase of DEGS content, the crystallizability and degree of crystallinity of the copolymers decreased, while the crystal structure kept unchanged; the thermal stability of the copolymers hardly changed, while the hydrophilicity and hydrolytic degradation rate increased. The tensile modulus decreased, but the elongation at break increased and the tensile strength increased first and then decreased with an increase of DEGS. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie300133a [article] Synthesis and properties of biodegradable poly (butylene succinate - co - diethylene glycol succinate) copolymers [texte imprimé] / Jian-Bing Zeng, Auteur ; Cai-Li Huang, Auteur ; Ling Jiao, Auteur . - 2012 . - pp. 12258–12265. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 38 (Septembre 2012) . - pp. 12258–12265 Mots-clés : Properties  biodegradable Résumé : Diethylene glycol was incorporated into poly(butylene succinate) (PBS) to form biodegradable poly(butylene succinate-co-diethylene glycol succinate) (P(BS-co-DEGS)) copolymer through a two-step procedure of esterification and polycondensation from succinic acid with 1,4-butanediol and diethylene glycol. The chemical structure of P(BS-co-DEGS) was confirmed by proton nuclear magnetic resonance spectroscopy (1H NMR). The effect of incorporated DEGS content on the molecular weight, thermal properties, crystallization behaviors, and hydrophilicity of the copolymers was investigated by gel permeation chromatography (GPC), differential scanning calorimetry (DSC), wide-angle X-ray diffraction (WAXD), thermogravimetry analysis (TGA), and water contact angle. The mechanical properties and hydrolytic degradation behaviors of P(BS-co-DEGS) were also studied. The results suggest that with an increase of DEGS content, the crystallizability and degree of crystallinity of the copolymers decreased, while the crystal structure kept unchanged; the thermal stability of the copolymers hardly changed, while the hydrophilicity and hydrolytic degradation rate increased. The tensile modulus decreased, but the elongation at break increased and the tensile strength increased first and then decreased with an increase of DEGS. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie300133a