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Novel materials from sesame husks and unsaturated polyester resin / Dipa Ray in Industrial & engineering chemistry research, Vol. 49 N° 13 (Juillet 2010)

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 49 N° 13 (Juillet 2010) . - pp. 6069–6074 Titre : Novel materials from sesame husks and unsaturated polyester resin Type de document : texte imprimé Auteurs : Dipa Ray, Auteur ; Keya Das, Auteur ; S. N. Ghosh, Auteur Année de publication : 2010 Article en page(s) : pp. 6069–6074 Note générale : Industrial chemistry Langues : Anglais (eng) Résumé : Sesame husks were used as filler, for the first time, to reinforce unsaturated polyester resin matrix composites. The sesame husk particles were subjected to an alkali treatment with 5% NaOH solution and were characterized with XRD and SEM. Composites were fabricated with untreated as well as alkali-treated sesame husks (33 wt % filler loading) and were characterized for their flexural properties, impact strength, dynamic mechanical properties, fracture behavior, water absorption characteristics, and thermal degradation behavior. The flexural strength, flexural modulus, and impact strength increased by 30%, 40%, and 46%, respectively, in the alkali-treated sesame husk-reinforced composites compared to those of untreated sesame husk-reinforced composites. Here, the increase in flexural strength properties was accompanied with increased impact strength, which is a unique feature of these composites. Water absorption was found to be 3.9% after 7 days in both the untreated as well as alkali-treated sesame husk-reinforced composites. [article] Novel materials from sesame husks and unsaturated polyester resin [texte imprimé] / Dipa Ray, Auteur ; Keya Das, Auteur ; S. N. Ghosh, Auteur . - 2010 . - pp. 6069–6074. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 49 N° 13 (Juillet 2010) . - pp. 6069–6074 Résumé : Sesame husks were used as filler, for the first time, to reinforce unsaturated polyester resin matrix composites. The sesame husk particles were subjected to an alkali treatment with 5% NaOH solution and were characterized with XRD and SEM. Composites were fabricated with untreated as well as alkali-treated sesame husks (33 wt % filler loading) and were characterized for their flexural properties, impact strength, dynamic mechanical properties, fracture behavior, water absorption characteristics, and thermal degradation behavior. The flexural strength, flexural modulus, and impact strength increased by 30%, 40%, and 46%, respectively, in the alkali-treated sesame husk-reinforced composites compared to those of untreated sesame husk-reinforced composites. Here, the increase in flexural strength properties was accompanied with increased impact strength, which is a unique feature of these composites. Water absorption was found to be 3.9% after 7 days in both the untreated as well as alkali-treated sesame husk-reinforced composites.

Physicomechanical and thermal properties of jute-nanofiber-reinforced biocopolyester composites / Kunal Das in Industrial & engineering chemistry research, Vol. 49 N° 6 (Mars 2010) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 49 N° 6 (Mars 2010) . - pp. 2775–2782 Titre : Physicomechanical and thermal properties of jute-nanofiber-reinforced biocopolyester composites Type de document : texte imprimé Auteurs : Kunal Das, Auteur ; Dipa Ray, Auteur ; Chitrita Banerjee, Auteur Année de publication : 2010 Article en page(s) : pp. 2775–2782 Note générale : Industrial Chemistry Langues : Anglais (eng) Mots-clés : Physicomechanical;  Thermal  Properties;  Jute;  Nanofiber;  Biocopolyester;  Composites Résumé : Jute nanofibers (JNFs) were prepared by treating jute fibers with alkali and dimethyl sulfoxide (DMSO) and then applying acid hydrolysis and were characterized by transmission electron microscopy, scanning electron microscopy, atomic force microscopy, and X-ray diffraction. The JNFs exhibited both spherical an elliptical shapes, with diameter in the range of 50−120 nm. Biocopolyester matrix was reinforced with JNFs at three different loadings (5, 10, and 15 wt %), and the JNF-loaded biocomposites were characterized by X-ray diffraction, tensile testing, differential scanning calorimetry, and moisture uptake. The enhancement in properties was highest for 10 wt % JNF-loaded composites, indicating the most uniform dispersion in this material. Note de contenu : Bibiogr. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie9019984 [article] Physicomechanical and thermal properties of jute-nanofiber-reinforced biocopolyester composites [texte imprimé] / Kunal Das, Auteur ; Dipa Ray, Auteur ; Chitrita Banerjee, Auteur . - 2010 . - pp. 2775–2782. Industrial Chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 49 N° 6 (Mars 2010) . - pp. 2775–2782 Mots-clés : Physicomechanical;  Thermal  Properties;  Jute;  Nanofiber;  Biocopolyester;  Composites Résumé : Jute nanofibers (JNFs) were prepared by treating jute fibers with alkali and dimethyl sulfoxide (DMSO) and then applying acid hydrolysis and were characterized by transmission electron microscopy, scanning electron microscopy, atomic force microscopy, and X-ray diffraction. The JNFs exhibited both spherical an elliptical shapes, with diameter in the range of 50−120 nm. Biocopolyester matrix was reinforced with JNFs at three different loadings (5, 10, and 15 wt %), and the JNF-loaded biocomposites were characterized by X-ray diffraction, tensile testing, differential scanning calorimetry, and moisture uptake. The enhancement in properties was highest for 10 wt % JNF-loaded composites, indicating the most uniform dispersion in this material. Note de contenu : Bibiogr. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie9019984

Physicomechanical and thermal properties of jute-nanofiber-reinforced biocopolyester composites / Kunal Das in Industrial & engineering chemistry research, Vol. 49 N° 6 (Mars 2010) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 49 N° 6 (Mars 2010) . - pp. 2775–2782 Titre : Physicomechanical and thermal properties of jute-nanofiber-reinforced biocopolyester composites Type de document : texte imprimé Auteurs : Kunal Das, Auteur ; Dipa Ray, Auteur ; Chitrita Banerjee, Auteur Année de publication : 2010 Article en page(s) : pp. 2775–2782 Note générale : Industrial Chemistry Langues : Anglais (eng) Mots-clés : Physicomechanical;  Thermal;  Jute;  Nanofiber;  Reinforced;  Biocopolyester;  Composites Résumé : Jute nanofibers (JNFs) were prepared by treating jute fibers with alkali and dimethyl sulfoxide (DMSO) and then applying acid hydrolysis and were characterized by transmission electron microscopy, scanning electron microscopy, atomic force microscopy, and X-ray diffraction. The JNFs exhibited both spherical an elliptical shapes, with diameter in the range of 50−120 nm. Biocopolyester matrix was reinforced with JNFs at three different loadings (5, 10, and 15 wt %), and the JNF-loaded biocomposites were characterized by X-ray diffraction, tensile testing, differential scanning calorimetry, and moisture uptake. The enhancement in properties was highest for 10 wt % JNF-loaded composites, indicating the most uniform dispersion in this material. Note de contenu : Bibiogr. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie9019984 [article] Physicomechanical and thermal properties of jute-nanofiber-reinforced biocopolyester composites [texte imprimé] / Kunal Das, Auteur ; Dipa Ray, Auteur ; Chitrita Banerjee, Auteur . - 2010 . - pp. 2775–2782. Industrial Chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 49 N° 6 (Mars 2010) . - pp. 2775–2782 Mots-clés : Physicomechanical;  Thermal;  Jute;  Nanofiber;  Reinforced;  Biocopolyester;  Composites Résumé : Jute nanofibers (JNFs) were prepared by treating jute fibers with alkali and dimethyl sulfoxide (DMSO) and then applying acid hydrolysis and were characterized by transmission electron microscopy, scanning electron microscopy, atomic force microscopy, and X-ray diffraction. The JNFs exhibited both spherical an elliptical shapes, with diameter in the range of 50−120 nm. Biocopolyester matrix was reinforced with JNFs at three different loadings (5, 10, and 15 wt %), and the JNF-loaded biocomposites were characterized by X-ray diffraction, tensile testing, differential scanning calorimetry, and moisture uptake. The enhancement in properties was highest for 10 wt % JNF-loaded composites, indicating the most uniform dispersion in this material. Note de contenu : Bibiogr. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie9019984

Preparation and characterization of cross-linked starch/poly(vinyl alcohol) green films with low moisture absorption / Kunal Das in Industrial & engineering chemistry research, Vol. 49 N° 5 (Mars 2010) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 49 N° 5 (Mars 2010) . - pp. 2176–2185 Titre : Preparation and characterization of cross-linked starch/poly(vinyl alcohol) green films with low moisture absorption Type de document : texte imprimé Auteurs : Kunal Das, Auteur ; Dipa Ray, Auteur ; N. R. Bandyopadhyay, Auteur Année de publication : 2010 Article en page(s) : pp. 2176–2185 Note générale : Industrial Chemistry Langues : Anglais (eng) Mots-clés : Starch/poly(vinyl  alcohol);  TGA Résumé : The effects of incorporating different cross-linking agents into starch/poly(vinyl alcohol) (PVA) blend were examined by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), mechanical characterization, dynamic mechanical analysis (DMA), thermogravimetric analysis (TGA), moisture absorption tests, and scanning electron microscopy (SEM). Different cross-linkers such as borax, formaldehyde, epichlorohydrin, and ZnO were used to cross-link the films at the same weight percent. The films were prepared by gelatinization followed by a solution casting method. SEM microstructures revealed that the destructuring of starch granules was significantly influenced by the presence of cross-linkers during the gelatinization process. The extent of cross-linking was measured through the determination of the normalized gel mass and the normalized swelling degree of the films in dimethyl sulfoxide (DMSO) solvent. Tensile strength and tensile modulus were highest in borax cross-linked film, while the highest flexibility was achieved with the epichlorohydrin cross-linked film. Damping was remarkably increased, and moisture absorption was considerably decreased in the cross-linked films. The onset of thermal degradation was lowered, but the char yield was slightly increased in the cross-linked films. Note de contenu : Bibliogr. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie901092n [article] Preparation and characterization of cross-linked starch/poly(vinyl alcohol) green films with low moisture absorption [texte imprimé] / Kunal Das, Auteur ; Dipa Ray, Auteur ; N. R. Bandyopadhyay, Auteur . - 2010 . - pp. 2176–2185. Industrial Chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 49 N° 5 (Mars 2010) . - pp. 2176–2185 Mots-clés : Starch/poly(vinyl  alcohol);  TGA Résumé : The effects of incorporating different cross-linking agents into starch/poly(vinyl alcohol) (PVA) blend were examined by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), mechanical characterization, dynamic mechanical analysis (DMA), thermogravimetric analysis (TGA), moisture absorption tests, and scanning electron microscopy (SEM). Different cross-linkers such as borax, formaldehyde, epichlorohydrin, and ZnO were used to cross-link the films at the same weight percent. The films were prepared by gelatinization followed by a solution casting method. SEM microstructures revealed that the destructuring of starch granules was significantly influenced by the presence of cross-linkers during the gelatinization process. The extent of cross-linking was measured through the determination of the normalized gel mass and the normalized swelling degree of the films in dimethyl sulfoxide (DMSO) solvent. Tensile strength and tensile modulus were highest in borax cross-linked film, while the highest flexibility was achieved with the epichlorohydrin cross-linked film. Damping was remarkably increased, and moisture absorption was considerably decreased in the cross-linked films. The onset of thermal degradation was lowered, but the char yield was slightly increased in the cross-linked films. Note de contenu : Bibliogr. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie901092n