Effect of melt and mold temperature on fiber orientation during flow in injection molding of reinforced plastics / P. Shokri in INTERNATIONAL POLYMER PROCESSING, Vol. XXI, N° 5 (11/2006)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XXI, N° 5 (11/2006) . - p. 480-486 Titre : Effect of melt and mold temperature on fiber orientation during flow in injection molding of reinforced plastics Type de document : texte imprimé Auteurs : P. Shokri, Auteur ; Naresh Bhatnagar, Auteur Année de publication : 2006 Article en page(s) : p. 480-486 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 668.9 Polymères Résumé : Injection molding, a highly productive manufacturing process, is one of the most versatile production methods in plastic manufacturing industry. It is capable of producing intricate net shapes without requiring finishing treatment and with good dimensional accuracy. In injection molding of reinforced thermoplastics the properties of the final product highly depend on the state of fiber orientation. Tailoring the fiber orientation in the final product, in order to control the properties, is the basic motivation of this study. Among different parameters, which could affect the orientation patterns, this study is concerned on analyzing the effects of mold and melt temperature on the state of fiber orientation during flow. In contrast to the melt temperature, which has a limited range for variation, mold temperature provides wide range of possible input at different locations such that by revealing its effect it could become one of the most attractive parameters in controlling the properties of injection molded fiber reinforced thermoplastic products. DOI : https://doi.org/10.3139/217.0977 En ligne : https://drive.google.com/file/d/1O50v4-AoiDGqyaYFS70rSAaG1Q4gXQC7/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=2802 [article]

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Injection molding of long fiber reinforced thermoplastic composites / K. S. Kumar in INTERNATIONAL POLYMER PROCESSING, Vol. XXIV, N° 1 (03/2009)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XXIV, N° 1 (03/2009) . - p. 17-22 Titre : Injection molding of long fiber reinforced thermoplastic composites Type de document : texte imprimé Auteurs : K. S. Kumar, Auteur ; V. Patel, Auteur ; A. Tyagi, Auteur ; Naresh Bhatnagar, Auteur ; A. K. Ghosh, Auteur Année de publication : 2009 Article en page(s) : p. 17-22 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Composites à fibres -- Moulage par injection Composites à fibres de carbone Composites à fibres de verre Composites à fibres longues Index. décimale : 668.9 Polymères Résumé : Long fiber reinforced thermoplastic composites are one of the fastest growing segments experiencing 30% growth per year, over the last decade. This study describes the development of long fiber reinforced thermoplastic (LFRT) composites and the effect of fiber length on mold and process parameters of injection molding process. LFRT pellets of different sizes were prepared by an extrusion process using a specially designed impregnation die and palletized into different lengths. These pellets were injection molded to develop LFRT composites. Fiber length distributions were analyzed using a profile projector and an image analyzer software system. Maleic anhydride grafted polypropylene (MA-g-PP) was added to improve the adhesion between glass fibers and polypropylene. Improvement in mechanical properties were analyzed for different pellet sizes with different fiber content for long fiber reinforced polypropylene (LFPP) and long fiber reinforced polyamide (LFPA) composite. DOI : 10.3139/217.2143 En ligne : https://drive.google.com/file/d/1MGGvKs3lXF9uLirIOG29kIRIowCS3T4_/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=4203 [article]

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Microcellular PP vs. microcellular PP/MMT nanocomposites : a comparative study of their mechanical behavior / S. J. A. Rizvi in INTERNATIONAL POLYMER PROCESSING, Vol. XXVI, N° 4 (09/2011)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XXVI, N° 4 (09/2011) . - p. 375-382 Titre : Microcellular PP vs. microcellular PP/MMT nanocomposites : a comparative study of their mechanical behavior Type de document : texte imprimé Auteurs : S. J. A. Rizvi, Auteur ; Naresh Bhatnagar, Auteur Année de publication : 2011 Article en page(s) : p. 375-382 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Anhydride maléique Azote Copolymères greffés Extrudeuse bi-vis Fluides supercritiques Matières plastiques -- Moulage par injection microcellulaire Montmorillonite Mousses plastiques -- Extrusion Mousses plastiques -- Propriétés mécaniques Nanoparticules Nucléation Polypropylène Index. décimale : 668.9 Polymères Résumé : Microcellular foams have attracted interest in both scientific and industrial communities. Injection molding is perhaps the most versatile industrial method of polymer processing. Microcellular injection molding is a newcomer variant in this class. It is capable to produce microcellular structure. The mechanical behavior of a microcellular polymer is different than conventional foams. Although they exhibit much improved mechanical properties than conventional foams still they are inferior to solid polymer. Incorporation of nanoparticles in matrix may affect the nucleation and bubble growth process. Further, nanoparticles will enhance the performance (stiffness, strength etc.) of matrix. In present study an effort has been made to quantitatively analyze the improvements in mechanical properties of microcellular foam with the addition of nanoclay (MMT). Nanocomposite of polypropylene and nanoclay was prepared in a co-rotating twin screw extruder. Maleic anhydride grafted polypropylene (PP-g-MA) was used as compatibilizer. PP/nanocomposites were foamed in a microcellular injection molding machine, where supercritical nitrogen (SCF-N2) was mixed with plasticized PP/ nanocomposite inside the screw – barrel assembly. The molded foamed samples were tested for various mechanical properties. Experimental results show that a considerable improvement occur in the property of microcellular polypropylene by the addition of 2 wt.% nanoclay (MMT). DOI : 10.3139/217.2375 En ligne : https://drive.google.com/file/d/1f6-1RrQ1xrQyO-cb5JWkYXr4szFJ_G6i/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=12435 [article]

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Optimization of microcellular injection molding parameters / S. J. A. Rizvi in INTERNATIONAL POLYMER PROCESSING, Vol. XXIV, N° 5 (11/2009)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XXIV, N° 5 (11/2009) . - p. 399-405 Titre : Optimization of microcellular injection molding parameters Type de document : texte imprimé Auteurs : S. J. A. Rizvi, Auteur ; Naresh Bhatnagar, Auteur Année de publication : 2009 Article en page(s) : p. 399-405 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 668.9 Polymères Résumé : Microcellular foamed polymeric products have found various applications depending upon their cell morphology. The microcellular injection molding process parameters have effect on the cell size, cell density and cell distribution. In order to develop desired cell morphology for a particular application, the set of injection molding parameters is required to be optimized for achieving a correct process window. In this paper an effort is made to study the effect of various injection molding processing parameters on cell morphology. Series of experiments were conducted for each of the processing parameter and the samples were observed under Scanning Electron Microscope (SEM). The trends of cell size and cell density with respect to the processing parameters were qualitatively analyzed. The results are useful for the processors who are interested in building up an understanding of this novel process and also to enable optimization of the set of processing parameters so that the desired microstructure of a foamed polymer can be obtained. DOI : 10.3139/217.2263 En ligne : https://drive.google.com/file/d/1CEZlSlySVbloDR9Rj7HTKTa5l4c9I1OB/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=6362 [article]

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Processing of polyetherimide/cloisite 30B nanocomposite by vibration casting method / M. Dwivedi in INTERNATIONAL POLYMER PROCESSING, Vol. XXIX, N° 5 (11/2014)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XXIX, N° 5 (11/2014) . - p. 635-640 Titre : Processing of polyetherimide/cloisite 30B nanocomposite by vibration casting method Type de document : texte imprimé Auteurs : M. Dwivedi, Auteur ; K. K. Gaur, Auteur ; S. Alam, Auteur ; Naresh Bhatnagar, Auteur ; A. K. Ghosh, Auteur Année de publication : 2014 Article en page(s) : p. 635-640 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Cloisite Diméthylacétamide Matériaux hybrides -- Propriétés thermomécaniques Polyéther imide Vibrations (mécanique) Index. décimale : 668.9 Polymères Résumé : Vibration casting method was developed for making polyetherimide (PEI)/Cloisite 30B nanocomposite. Towards this, a vibration casting apparatus was designed and developed. Vibration casting apparatus provided vibrational energy and heat, simultaneously. The processing parameters were established for vibration casting in terms of frequency of vibration, temperature, time and viscosity of casting mixture. Casting mixture of PEI/Cloisite 30B/N,N-dimethyl acetamide (DMAc) was made by dissolving PEI in DMAc and then mixing Cloisite 30B in this solution. The viscosity of PEI/Cloisite 30B/DMAc mixture was optimized for casting by controlling the volume fraction of PEI in DMAc. Morphology of PEI/Cloisite 30B nanocomposite was examined by wide angle X-ray diffraction, transmission electron microscopy, scanning electron microscopy and contact angle measurement. Mechanical and thermal properties of PEI/Cloisite 30B nanocomposite were also compared with that of neat PEI to ascertain the efficacy of vibration casting method. Note de contenu : - EXPERIMENTAL : 1. Materials - 2. Design and Development of Vibration Casting Apparatus - 3. Optimisation of Viscosity - 4. Estimation of Frequency - 5. Processing of PEI/Cloisite 30B Nanocomposite - 6. Evaluation of Morphology - 7. Evaluation of Mechanical and Thermal Properties - RESULTS AND DISCUSSION : 1. Optimisation of Viscosity for Casting Mixture - 2. Frequency of Vibration to Cast PNC Film - 3. Morphology - 4. Mechanical and Thermal Properties DOI : 10.3139/217.2952 En ligne : https://drive.google.com/file/d/13ZlgK1wxyMJJC5UIE9yB6Xk1I2VR7oRr/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=22243 [article]

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Surface quenching induced microstructure transformations in extrusion foaming of porous sheets / A. Gandhi in INTERNATIONAL POLYMER PROCESSING, Vol. XXX, N° 3 (07/2015)  

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