Effect of mixing conditions and polymer particle size on the properties of polypropylene/graphite nanoplatelets micromoldings / Renze Jiang in INTERNATIONAL POLYMER PROCESSING, Vol. 37, N° 4 (2022)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. 37, N° 4 (2022) . - p. 372-382 Titre : Effect of mixing conditions and polymer particle size on the properties of polypropylene/graphite nanoplatelets micromoldings Type de document : texte imprimé Auteurs : Renze Jiang, Auteur ; Piyush Lashkari, Auteur ; Shengtai Zhou, Auteur ; Andrew N. Hrymak, Auteur Année de publication : 2022 Article en page(s) : p. 372-382 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Caractérisation Composites à fibres -- Moulage par micro-injection Composites à fibres de graphite Conducteurs organiques Microstructures Nanoparticules Polypropylène Thermocinétique Index. décimale : 668.4 Plastiques, vinyles Résumé : In this study, properties of polypropylene/graphite nanoplatelets (PP/GNP) composites and corresponding micromoldings were systematically studied in terms of filler loading concentrations and mixing methods. PP of different forms, i.e., PP pellets and powders, were adopted to fabricate PP/GNP composites. Additionally, a comparative study of precoating GNP and PP powders using solvent-based solution blending and ultrasonication-assisted mixing was performed. Results showed that PP/GNP composites prepared using powder form PP resulted in at least one order of magnitude higher electrical conductivity than using pellet form PP and further reduced the percolation threshold from 12.5 to 10 wt%, which was related to the state of filler distribution within corresponding moldings. Morphology observations revealed that microparts prepared with powder-PP/GNP composites exhibited less preferential alignment of GNP particles along the flow direction when compared with those molded using pellet-PP/GNP counterparts, which was helpful in improving the overall electrical conductivity for PP/GNP micromoldings. Note de contenu : - EXPERIMENTAL SECTION : Materials - Sample preparation - CHARACTERIZATION : Electrical conductivity - Morphology - Differential scanning calorimetry - RESULTS AND DISCUSSION : Electrical conductivity - Morphology - Differential scanning calorimetry - Table 1 : Characteristic Data from DSC Scans for PP/GNP feeds (top row) and µIM microparts (bottom row). Cycle 1: 1st heating cycle. Cycle 2: cooling cycle. Cycle 3: 2nd heating cycle DOI : https://doi.org/10.1515/ipp-2022-0004 En ligne : https://drive.google.com/file/d/1qw8Ibyf-E7sqUi1vjl_V9cgnu7o1L3jN/view?usp=shari [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37913 [article]

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