Biocomposites based on bacterial cellulose and apple and radish pulp / S. Gea in INTERNATIONAL POLYMER PROCESSING, Vol. XXII, N° 5 (11/2007)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XXII, N° 5 (11/2007) . - p. 497-501 Titre : Biocomposites based on bacterial cellulose and apple and radish pulp Type de document : texte imprimé Auteurs : S. Gea, Auteur ; F. G. Torres, Auteur ; O. P. Troncoso, Auteur ; C. T. Reynolds, Auteur ; F. Vilasecca, Auteur ; M. Iguchi, Auteur ; T. Peijs, Auteur Année de publication : 2007 Article en page(s) : p. 497-501 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 668.9 Polymères Résumé : Bacterial cellulose (BC) pellicles obtained from an Acetobacter xylinum culture were disintegrated using mechanical methods to be used as reinforcement to produce biocomposite sheets with Apple and Radish Pulp. The nanosize disintegrated BC pellicles were blended with microsize apple and radish pulp in the wet state and then hot pressed to produce paper-like sheets. Thermal analysis was carried out by Thermogravimetry Analysis (TGA). Mechanical properties were assessed by Quasistatic Tensile Tests and Dynamic Mechanical Analysis (DMA). High tensile moduli were obtained (up to 8 GPa) and a nearly linear dependence of Young's modulus on the BC volume fraction was observed. Morphological characterisation of biocomposite sheets and fracture surfaces performed by Scanning Electron Microscopy (SEM) revealed the structure of the disintegrated cellulose network and the failure mechanisms of the biocomposites. DOI : 10.3139/217.2059 En ligne : https://drive.google.com/file/d/1k2RpIhrbdBmiW3Hum0ENLhiGvzMbJwoV/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=2691 [article]

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Morphological characterisation of long glass fibre composites for the thermoforming process / S. F. Bush in INTERNATIONAL POLYMER PROCESSING, Vol. XV, N° 2 (06/2000)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XV, N° 2 (06/2000) . - p. 208-214 Titre : Morphological characterisation of long glass fibre composites for the thermoforming process Type de document : texte imprimé Auteurs : S. F. Bush, Auteur ; F. G. Torres, Auteur Année de publication : 2000 Article en page(s) : p. 208-214 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 668.9 Polymères Résumé : Molding - This paper lays out the main procedures for performing morphological characterisations of Long Glass Fibre (LGF) composites with particular reference to the sheet extrusion and thermoforming processes as they may be configured for production. The techniques used, including optical microscopy, scanning electron microscopy and image analysis, are described both with regard to their laboratory application to these materials and to their potential for monitoring the performance of the industrial manufacturing process. Results obtained from the different techniques at the three various stages of the manufacturing route are presented and discussed in terms of the structure property relationships obtained and the reinforcing fibre mat system typical of these types of material. Note de contenu : EXPERIMENTAL TECHNIQUES : Optical microscopy (OM) - Scanning Electron Microscopy (SEM) - Image Analysis - MATERIALS - RESULTS AND DISCUSSION : Fibre-matrix-contact in the LGF granules - Reinforcing fibre mats - Fibre length distribution measurement - Fractography - Surface finish DOI : 10.3139/217.1589 En ligne : https://drive.google.com/file/d/1BCxKNdVCWHShXemi9xj8SZwZP8PV5Eh8/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=16064 [article]

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Rotational moulding and powder processing of natural fibre reinforced thermoplastics / F. G. Torres in INTERNATIONAL POLYMER PROCESSING, Vol. XVIII, N° 2 (06/2003)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XVIII, N° 2 (06/2003) . - p. 204-210 Titre : Rotational moulding and powder processing of natural fibre reinforced thermoplastics Type de document : texte imprimé Auteurs : F. G. Torres, Auteur ; M. Aguirre, Auteur Année de publication : 2003 Article en page(s) : p. 204-210 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 668.9 Polymères Résumé : The present paper describes the development of a new processing technology: rotational moulding of natural fibre reinforced thermoplastics. Different polymer-natural fibre and polymer-flour systems have been characterised. A rotomoulding grade of high density polyethylene has been used as the polymer matrix for the experiments. Fibres, including jute, sisal and cabuya, as well as wood, pecan and rice shell flour of different types have been used as reinforcements. The rotomoulding process for those composite systems has been studied using an in-house built two-axis rotomoulding rig with variable speed. The final products have been characterised with special emphasis on estimating the level of dispersion of the fibres and their degree of orientation, as well as the consolidation, sintering and bubble formation processes during the different stages. Comparisons have been made with other powder processing routes, involving the sintering of fibre (or flour) reinforced polymer particles including compression moulding. Morphological characterisation techniques have been adapted to determine the structure-property relationships in these materials at different processing stages. Important improvements in the compression strength of the natural fibre reinforced rotomoulded products compared to the unreinforced materials, accompanied of a good dispersion level of the reinforcing fibres have been reported. DOI : 10.3139/217.1736 En ligne : https://drive.google.com/file/d/1V5m0hXTowdGcpegAAm-yCRsUq5gjbs96/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=3313 [article]

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Single screw extrusion of natural fibre reinforced thermoplastics (NFRTP) / F. G. Torres in INTERNATIONAL POLYMER PROCESSING, Vol. XVIII, N° 1 (03/2003)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XVIII, N° 1 (03/2003) . - p. 33-40 Titre : Single screw extrusion of natural fibre reinforced thermoplastics (NFRTP) : Study of the material transport processes Type de document : texte imprimé Auteurs : F. G. Torres, Auteur ; B. Ochoa, Auteur ; E. Machicao, Auteur Année de publication : 2003 Article en page(s) : p. 33-40 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 668.9 Polymères Résumé : Natural fibre reinforced thermoplastics are usually processed in twin screw extruders. The present work studies the single screw extrusion process for different systems of natural fibre reinforced thermoplastics. For this study different polymer-fibre systems have been characterised in terms of the material properties that are relevant to the processing behaviour of these materials. The extrusion process has been investigated using an open-barrel single screw extruder. This equipment can be stopped at any point in operation, cooled down and opened in order to study the material transport processes that take place inside the extruder. The polymer matrices used in this study have been mainly polyethylene and polypropylene (with MFIs varying from 0.3 to 4). Fibres including jute, sisal, and cabuya have been used as discrete reinforcements of a length of 5 to 10 mm. The experiments presented here study the transport processes during single screw extrusion with special emphasis on the bubble formation mechanisms. The bubble formation process has been studied in terms of the variation in the initial fibre dispersion at the entrance of the feeding zone of the extruder. A relationship between solids conveying, plastication and bubble formation has been proposed considering the different typical cases occurring in the single screw extrusion of NFRTPs. The use of coupling and dispersion agents has been studied in terms of its relationship to bubble formation and to the final quality of the extrudates produced. Finally, morphological characterisation techniques have been adapted to understand the structure-property relationships in these materials during the extrusion process. Note de contenu : - PROCESSING OF NATURAL FIBRE REINFORCED THERMOPLASTICS (NFRTP) - CHARACTERIZATION OF THE RELEVANT MATERIAL PROPERTIES - SINGLE SCREW EXTRUSION OF NATURAL FIBRE REINFORCED THERMOPLASTICS - STUDY OF PLASTIFICATION AND BUBBLE FORMATION IN SINGLE SCREW EXTRUSION - MECHANICAL AND MORPHOLOGICAL CHARACTERIZATION OF THE COMPOSITES DOI : 10.3139/217.1727 En ligne : https://drive.google.com/file/d/1F2eXVe1bg4Hw1OfekqLtv7TV3GgtwjHB/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=15848 [article]

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