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Effects of extrusion variables on organoclay intercalation and properties of tapioca starch-poly(lactic acid) nanocomposite foams / S. Y. Lee in INTERNATIONAL POLYMER PROCESSING, Vol. XXIV, N° 1 (03/2009)
[article]
Titre : Effects of extrusion variables on organoclay intercalation and properties of tapioca starch-poly(lactic acid) nanocomposite foams Type de document : texte imprimé Auteurs : S. Y. Lee, Auteur ; K. M. Eskridge, Auteur ; M. A. Hanna, Auteur Année de publication : 2009 Article en page(s) : p. 59-66 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Composites
Lactique, AcideL'acide lactique est un acide organique qui joue un rôle dans divers processus biochimiques. Un lactate est un sel de cet acide. Contrairement à ce que peut laisser penser son nom, l'acide lactique n'est pas présent uniquement dans le lait, mais également dans le vin, certains fruits et légumes, et dans les muscles.
L'acide lactique est un acide alpha hydroxylé, sa formule chimique est C3H6O3 et sa structure se reflète dans son nom systématique, l'acide 2-hydroxypropanoïque.
Matières plastiques -- Extrusion:Polymères -- Extrusion
Mousses (matériaux)
Nanoparticules
Polymères
TapiocaIndex. décimale : 668.4 Plastiques, vinyles Résumé : Tapioca starch (TS) and poly(lactic acid) (PLA), in 90:10 weight ratio, were blended with 3% Cloisite 10A were and prepared by a twin screw extruder. Screw speed, screw configuration, die nozzle diameter and moisture content were varied to determine their effects on organoclay intercalation. Selected structural, thermal, physical and mechanical properties were characterized by X-ray diffraction, scanning electron microscopy, differential scanning calorimetry, and Instron universal testing machine. The first (X-ray) diffraction peak was observed to shift to a lower angle compared to that of pristine Cloisite 10A. The first diffraction peaks for the nanocomposites were narrow, indicating a strong intercalated behavior. These results were observed for all extrusion variables using mixing and compression screws, screw speeds of 100, 135 and 175 min–1; moisture contents of 14, 17 and 20%, and die nozzle diameters of 3 and 4 mm. These extrusion variables had significant effects on the structural, thermal, physical and mechanical properties, and glass transition and melting temperatures of TS/PLA/Cloisite 10A nanocomposite foams due to the intercalation of organoclay. DOI : 10.3139/217.2188 En ligne : https://drive.google.com/file/d/1iq5jfGBq75aTYvf9ZkAC7djv2-_Y3UuA/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=4208
in INTERNATIONAL POLYMER PROCESSING > Vol. XXIV, N° 1 (03/2009) . - p. 59-66[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 011139 - Périodique Bibliothèque principale Documentaires Disponible Tapioca starch-poly (lactic acid)-based nanocomposite foams as affected by type of nanoclay / S. Y. Lee in INTERNATIONAL POLYMER PROCESSING, Vol. XXII, N° 5 (11/2007)
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Titre : Tapioca starch-poly (lactic acid)-based nanocomposite foams as affected by type of nanoclay Type de document : texte imprimé Auteurs : S. Y. Lee, Auteur ; Y. X. Xu, Auteur ; M. A. Hanna, Auteur Année de publication : 2007 Article en page(s) : p. 429-435 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 668.9 Polymères Résumé : Tapioca starch (TS), poly (lactic acid) (PLA), and clay nanocomposite foams, with three clays (Cloisite 30B, Na+, and 20A), were prepared by melt-intercalation method. The structural, thermal, physical and mechanical properties were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), differential scanning calorimetry (DSC), and Instron universal testing machine, respectively. XRD results indicated that the intercalation of TS/PLA into the nanoclay layers occurred for all three clays. The extents of intercalation depended on the types of clay and were exhibited in the sequence of Cloisite 30B > Na+ > 20A. At the same time, a mixture of intercalation and tactoid phenomena was observed for the TS/PLA/Cloisite Na+ nanocomposite. SEM results indicated a decrease in cell size of the TS/PLA foam matrix with the addition of nanoclay and cells had hexagonal and pentagonal shapes. Melting temperature (Tm) decreased with the addition of clays into TS/PLA matrix. Expansion ratios of the nanocomposites were significantly different (p < 0.05) from each other. TS/PLA/Cloisite Na+ nanocomposite had the highest expansion ratio of 20.9 compared to its TS/PLA/Cloisite 20A (9.65) and TS/PLA/Cloisite 30B counterparts (8.23). Addition of Cloisite Na+ resulted in the lowest unit density of 0.046 kg/m3, while no significant differences in unit density were observed for the foams with addition of Cloisite 30B and Cloisite 20A. Bulk spring index (BSI) was influenced significantly (p < 0.05) with the addition of nanoclays into the TS/PLA matrix. TS/PLA/Cloisite Na+ nanocomposite had the lowest BSI of 0.936. The bulk compressibility was decreased from 14.1 MPa for pure tapioca starch foam to 4.45 MPa with the addition of PLA. The nanocomposite with Cloisite 30B showed the highest value of 17.4 MPa, followed by those with Cloisite 20A (10.4 MPa), and Cloisite Na+ (6.47 MPa). DOI : 10.3139/217.2054 En ligne : https://drive.google.com/file/d/1ef5Zg8J-zpWQYLTdS3isuuPaw8wn8tLP/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=2684
in INTERNATIONAL POLYMER PROCESSING > Vol. XXII, N° 5 (11/2007) . - p. 429-435[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 008361 - Périodique Bibliothèque principale Documentaires Disponible