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Structure and properties of blend films prepared from castor oil-based polyurethane/soy protein derivative / Dagang Liu in Industrial & engineering chemistry research, Vol. 47 N° 23 (Décembre 2008) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 47 N° 23 (Décembre 2008) . - p. 9330–9336 Titre : Structure and properties of blend films prepared from castor oil-based polyurethane/soy protein derivative Type de document : texte imprimé Auteurs : Dagang Liu, Auteur ; Huafeng Tian, Auteur ; Lina Zhang, Auteur Année de publication : 2009 Article en page(s) : p. 9330–9336 Note générale : Chemistry engineering Langues : Anglais (eng) Mots-clés : Blend  films  Castor  oil-based  polyurethane  Soy  protein Résumé : We successfully prepared a series of transparent blend films from castor oil-based polyurethane (PU) and p-phenylene diamine soy protein (PDSP). The miscibility, morphology, and properties of the blend films were investigated with Fourier transform infrared spectroscopy, differential scanning calorimetry, dynamic mechanical thermal analysis, scanning electron microscopy, moisture adsorption, thermal degradation, and tensile testing. The results revealed that the PDSP exhibited certain miscibility with PU varied its content from 10 to 80 wt % and also showed the strong hydrogen-bond and chemical cross-linking interactions lied between PU and PDSP. With an increase in the PU content, the elongation at break, thermal stability, and water resistance were improved whereas the tensile strength and Young’s modulus decreased. It is worth noting that modified soy protein could be blended with hydrophobic polyurethane to obtain the blend films having good mechanical properties and optical transmittance. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie8009632 [article] Structure and properties of blend films prepared from castor oil-based polyurethane/soy protein derivative [texte imprimé] / Dagang Liu, Auteur ; Huafeng Tian, Auteur ; Lina Zhang, Auteur . - 2009 . - p. 9330–9336. Chemistry engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 47 N° 23 (Décembre 2008) . - p. 9330–9336 Mots-clés : Blend  films  Castor  oil-based  polyurethane  Soy  protein Résumé : We successfully prepared a series of transparent blend films from castor oil-based polyurethane (PU) and p-phenylene diamine soy protein (PDSP). The miscibility, morphology, and properties of the blend films were investigated with Fourier transform infrared spectroscopy, differential scanning calorimetry, dynamic mechanical thermal analysis, scanning electron microscopy, moisture adsorption, thermal degradation, and tensile testing. The results revealed that the PDSP exhibited certain miscibility with PU varied its content from 10 to 80 wt % and also showed the strong hydrogen-bond and chemical cross-linking interactions lied between PU and PDSP. With an increase in the PU content, the elongation at break, thermal stability, and water resistance were improved whereas the tensile strength and Young’s modulus decreased. It is worth noting that modified soy protein could be blended with hydrophobic polyurethane to obtain the blend films having good mechanical properties and optical transmittance. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie8009632

Structure and properties of soy protein plastics with ε-caprolactone/glycerol as binary plasticizers / Pu Chen in Industrial & engineering chemistry research, Vol. 47 N° 23 (Décembre 2008) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 47 N° 23 (Décembre 2008) . - p. 9389–9395 Titre : Structure and properties of soy protein plastics with ε-caprolactone/glycerol as binary plasticizers Type de document : texte imprimé Auteurs : Pu Chen, Auteur ; Huafeng Tian, Auteur ; Lina Zhang, Auteur Année de publication : 2009 Article en page(s) : p. 9389–9395 Note générale : Chemistry engineering Langues : Anglais (eng) Mots-clés : Properties  soy  protein  plastics  ε-Caprolactone  Binary  plasticizers Résumé : We successfully prepared a series of soy protein isolate (SPI) plastics with ε-caprolactone (CL)/glycerol binary plasticizers via extrusion and compression-molding. The chemical reactions among SPI, CL, and glycerol as well as the influence of CL/glycerol content on the microstructure, thermal degradation, and mechanical properties have been investigated using Fourier transform infrared spectroscopy (FTIR), scanning electron microscope (SEM), differential scanning calorimetry (DSC), dynamic mechanical thermal analysis (DMTA), thermogravimetric analysis-Fourier transform infrared spectroscopy (TGA-FTIR), and mechanical tests. The results of FTIR, SEM, DSC, and DMTA revealed that CL reacted with protein and glycerol molecules under high-temperature, high-shear, and high-pressure conditions. When the CL content was low (less than 25 wt %), the CL added to the protein matrix was dispersed mainly in the glycerol-rich domains and reacted with glycerol. However, at a higher concentration, the CL predominated in the protein-rich domains and reacted with protein molecules. The chemical reactions led to a significant increase in glass transition and mechanical relaxation temperatures of the glycerol-rich and protein-rich domains. Accordingly, the chemical reactions retarded the volatilization of glycerol and the release of NH3 and CO2 and elevated the tensile strength, Young’s modulus, and the water resistance of the soy protein plastic sheets. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie800371f#afn1 [article] Structure and properties of soy protein plastics with ε-caprolactone/glycerol as binary plasticizers [texte imprimé] / Pu Chen, Auteur ; Huafeng Tian, Auteur ; Lina Zhang, Auteur . - 2009 . - p. 9389–9395. Chemistry engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 47 N° 23 (Décembre 2008) . - p. 9389–9395 Mots-clés : Properties  soy  protein  plastics  ε-Caprolactone  Binary  plasticizers Résumé : We successfully prepared a series of soy protein isolate (SPI) plastics with ε-caprolactone (CL)/glycerol binary plasticizers via extrusion and compression-molding. The chemical reactions among SPI, CL, and glycerol as well as the influence of CL/glycerol content on the microstructure, thermal degradation, and mechanical properties have been investigated using Fourier transform infrared spectroscopy (FTIR), scanning electron microscope (SEM), differential scanning calorimetry (DSC), dynamic mechanical thermal analysis (DMTA), thermogravimetric analysis-Fourier transform infrared spectroscopy (TGA-FTIR), and mechanical tests. The results of FTIR, SEM, DSC, and DMTA revealed that CL reacted with protein and glycerol molecules under high-temperature, high-shear, and high-pressure conditions. When the CL content was low (less than 25 wt %), the CL added to the protein matrix was dispersed mainly in the glycerol-rich domains and reacted with glycerol. However, at a higher concentration, the CL predominated in the protein-rich domains and reacted with protein molecules. The chemical reactions led to a significant increase in glass transition and mechanical relaxation temperatures of the glycerol-rich and protein-rich domains. Accordingly, the chemical reactions retarded the volatilization of glycerol and the release of NH3 and CO2 and elevated the tensile strength, Young’s modulus, and the water resistance of the soy protein plastic sheets. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie800371f#afn1

Structure and properties of tough thermoplastic starch modified with polyurethane microparticles / Qiangxian Wu ; Zhengshun Wu ; Huafeng Tian in Industrial & engineering chemistry research, Vol. 47 n°24 (Décembre 2008) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 47 n°24 (Décembre 2008) . - p. 9896–9902 Titre : Structure and properties of tough thermoplastic starch modified with polyurethane microparticles Type de document : texte imprimé Auteurs : Qiangxian Wu, Auteur ; Zhengshun Wu, Auteur ; Huafeng Tian, Auteur Année de publication : 2009 Article en page(s) : p. 9896–9902 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Thermoplastic  Polyurethane Résumé : Aged thermoplastic starch (TPS), plasticized with hydrophilic plasticizers such as glycerol, shows brittle property. It is critical to develop tough TPS without using hydrophilic plasticizers. In this work, polyurethane prepolymer (PUP) was synthesized and mixed reactively with TPS in an intensive mixer to prepare modified TPS. Structural and morphological analyses showed that polyurethane (PU) microparticles were formed in situ and dynamically cross-linked to the starch matrix through urethane linkages. The modified TPS without hydrophilic plasticizer become tough. The elastic polyol soft segments in PU played the role of impact modifier, improving the toughness of the modified TPS. Almost 100% of PU was cross-linked to starch, indicating high efficiency of the modification. Formation of multifunctional PU microparticles was essential to achieve the high reaction efficiency. The dynamically cross-linking modification is a novel, green, and efficient method for preparing tough TPS. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie801005w [article] Structure and properties of tough thermoplastic starch modified with polyurethane microparticles [texte imprimé] / Qiangxian Wu, Auteur ; Zhengshun Wu, Auteur ; Huafeng Tian, Auteur . - 2009 . - p. 9896–9902. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 47 n°24 (Décembre 2008) . - p. 9896–9902 Mots-clés : Thermoplastic  Polyurethane Résumé : Aged thermoplastic starch (TPS), plasticized with hydrophilic plasticizers such as glycerol, shows brittle property. It is critical to develop tough TPS without using hydrophilic plasticizers. In this work, polyurethane prepolymer (PUP) was synthesized and mixed reactively with TPS in an intensive mixer to prepare modified TPS. Structural and morphological analyses showed that polyurethane (PU) microparticles were formed in situ and dynamically cross-linked to the starch matrix through urethane linkages. The modified TPS without hydrophilic plasticizer become tough. The elastic polyol soft segments in PU played the role of impact modifier, improving the toughness of the modified TPS. Almost 100% of PU was cross-linked to starch, indicating high efficiency of the modification. Formation of multifunctional PU microparticles was essential to achieve the high reaction efficiency. The dynamically cross-linking modification is a novel, green, and efficient method for preparing tough TPS. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie801005w