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Isothermal and nonisothermal cold crystallization behaviors of biodegradable poly (l-lactide) / octavinyl - polyhedral oligomeric silsesquioxanes nanocomposites / Jing Yu in Industrial & engineering chemistry research, Vol. 50 N° 22 (Novembre 2011) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 50 N° 22 (Novembre 2011) . - pp. 12579–12586 Titre : Isothermal and nonisothermal cold crystallization behaviors of biodegradable poly (l-lactide) / octavinyl - polyhedral oligomeric silsesquioxanes nanocomposites Type de document : texte imprimé Auteurs : Jing Yu, Auteur ; Zhaobin Qiu, Auteur Année de publication : 2012 Article en page(s) : pp. 12579–12586 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Crystallization  Biodegradable  Nanocomposites Résumé : Isothermal and nonisothermal cold crystallization behaviors of biodegradable poly(l-lactide) (PLLA)/octavinyl-polyhedral oligomeric silsesquioxanes (ovi-POSS) nanocomposites at low ovi-POSS loadings were investigated in this work. For both neat PLLA and its nanocomposites, the overall isothermal cold crystallization rates increase with increasing crystallization temperature; moreover, the overall isothermal cold crystallization rates of PLLA increase with increasing the ovi-POSS loading in the nanocomposites relative to neat PLLA, indicative of the nucleating agent effect of ovi-POSS. Crystallization mechanism and crystal structure of PLLA remain unchanged despite the ovi-POSS loading. For the nonisothermal cold crystallization, the crystallization process of PLLA is accelerated by increasing both heating rate and the ovi-POSS loading. The Ozawa equation failed to fit the crystallization process, while the Tobin equation could describe it well. The activation energies of nonisothermal cold crystallization were calculated by the Kissinger method, which increase with increasing the ovi-POSS loading in the nanocomposites relative to neat PLLA. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie201691y [article] Isothermal and nonisothermal cold crystallization behaviors of biodegradable poly (l-lactide) / octavinyl - polyhedral oligomeric silsesquioxanes nanocomposites [texte imprimé] / Jing Yu, Auteur ; Zhaobin Qiu, Auteur . - 2012 . - pp. 12579–12586. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 50 N° 22 (Novembre 2011) . - pp. 12579–12586 Mots-clés : Crystallization  Biodegradable  Nanocomposites Résumé : Isothermal and nonisothermal cold crystallization behaviors of biodegradable poly(l-lactide) (PLLA)/octavinyl-polyhedral oligomeric silsesquioxanes (ovi-POSS) nanocomposites at low ovi-POSS loadings were investigated in this work. For both neat PLLA and its nanocomposites, the overall isothermal cold crystallization rates increase with increasing crystallization temperature; moreover, the overall isothermal cold crystallization rates of PLLA increase with increasing the ovi-POSS loading in the nanocomposites relative to neat PLLA, indicative of the nucleating agent effect of ovi-POSS. Crystallization mechanism and crystal structure of PLLA remain unchanged despite the ovi-POSS loading. For the nonisothermal cold crystallization, the crystallization process of PLLA is accelerated by increasing both heating rate and the ovi-POSS loading. The Ozawa equation failed to fit the crystallization process, while the Tobin equation could describe it well. The activation energies of nonisothermal cold crystallization were calculated by the Kissinger method, which increase with increasing the ovi-POSS loading in the nanocomposites relative to neat PLLA. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie201691y

Preparation, characterization, and flame retardancy of novel rosin - based siloxane epoxy resins / Lianli Deng 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. 8178-8184 Titre : Preparation, characterization, and flame retardancy of novel rosin - based siloxane epoxy resins Type de document : texte imprimé Auteurs : Lianli Deng, Auteur ; Minmin Shen, Auteur ; Jing Yu, Auteur Année de publication : 2012 Article en page(s) : pp. 8178-8184 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Flame  Preparation Résumé : A series of novel rosin-based siloxane epoxy resins (AESE copolymers) were prepared by the reaction of ethylene glycol diglycidyl ether modified acrylpimaric acid (AP-EGDE) with poly(methylphenylsiloxane). The chemical structures of the produced epoxy resins were determined by FTIR, 1H-NMR, 13C-NMR, and epoxy equivalent weight (EEW) test. After modification, the tensile strengths of AESE (20-40) are slightly lower than that of AP-EGDE; however their breaking elongations are higher than that of AP-EGDE remarkably. TGA results reveal that the thermal stability of AESE serials is better than that of AP-EGDE due to the formation of a protective residue. The char residue of AESE increases at 700 °C with its silicon content increases. Nevertheless, there is a peak LOI value for AESE when its silicon content is 30%. Moreover, the chemical structures of char at the end of the LOI test were analyzed by FTIR The results confirmed the formation of the protective residue. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=26029653 [article] Preparation, characterization, and flame retardancy of novel rosin - based siloxane epoxy resins [texte imprimé] / Lianli Deng, Auteur ; Minmin Shen, Auteur ; Jing Yu, Auteur . - 2012 . - pp. 8178-8184. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 24 (Juin 2012) . - pp. 8178-8184 Mots-clés : Flame  Preparation Résumé : A series of novel rosin-based siloxane epoxy resins (AESE copolymers) were prepared by the reaction of ethylene glycol diglycidyl ether modified acrylpimaric acid (AP-EGDE) with poly(methylphenylsiloxane). The chemical structures of the produced epoxy resins were determined by FTIR, 1H-NMR, 13C-NMR, and epoxy equivalent weight (EEW) test. After modification, the tensile strengths of AESE (20-40) are slightly lower than that of AP-EGDE; however their breaking elongations are higher than that of AP-EGDE remarkably. TGA results reveal that the thermal stability of AESE serials is better than that of AP-EGDE due to the formation of a protective residue. The char residue of AESE increases at 700 °C with its silicon content increases. Nevertheless, there is a peak LOI value for AESE when its silicon content is 30%. Moreover, the chemical structures of char at the end of the LOI test were analyzed by FTIR The results confirmed the formation of the protective residue. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=26029653