Documents disponibles écrits par cet auteur

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