Influence of mold cavity thickness on electrical, morphological and thermal properties of polypropylene/carbon micromoldings / Shengtai Zhou in INTERNATIONAL POLYMER PROCESSING, Vol. 38, N° 2 (2023)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. 38, N° 2 (2023) . - p. 214-224 Titre : Influence of mold cavity thickness on electrical, morphological and thermal properties of polypropylene/carbon micromoldings Type de document : texte imprimé Auteurs : Shengtai Zhou, Auteur ; Renze Jiang, Auteur ; Xue Lei, Auteur ; Huawei Zou, Auteur ; Andrew N. Hrymak, Auteur Année de publication : 2023 Article en page(s) : p. 214-224 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Composites -- Moulage par micro-injection Composites -- Propriétés électriques Composites -- Propriétés thermiques Conduction électrique Etudes comparatives Matériaux -- Epaisseur Micropièces Moules d'injection Nanotubes Noir de carbone Polypropylène Index. décimale : 668.4 Plastiques, vinyles Résumé : In this work, a comparative study on the electrical conductivity (σ) and thermal properties of polypropylene (PP)/carbon microparts with different part thickness (namely, 0.85 and 0.50 mm) is reported. Two different types of carbon filler (i.e., CNT and CB) were adopted to study the efficacy of different carbon fillers in improving the σ of PP/carbon microparts. In general, the σ of 0.85 mm thickness microparts were higher than the 0.50 mm thickness microparts, regardless of the carbon filler type and testing directions. This suggested that higher shearing conditions that prevailed in the microinjection molding (μIM) process were unfavorable for the formation of intact conductive pathways in corresponding moldings, albeit the distribution of carbon fillers turned better with increasing shear rates, as confirmed by morphology observations. Differential scanning calorimetry results showed that prior thermomechanical histories (including melt blending and μIM) experienced by the polymer melts had an influence on the thermal behavior of subsequent moldings. Also, there existed a strong shear flow-induced crystallization of polymer chains during μIM because the crystallinity of microparts was higher than that of feed materials. Note de contenu : - EXPERIMENTAL SECTION : Materials - Preparation of samples - CHARACTERIZATION : Electrical conductivity - Simulation - Morphology - Differential scanning calorimetry - RESULTS AND DISCUSSION : Electrical conductivity and simulation - Morphology - Melting and crystallization behavior - Table 1 : Characteristic data from DSC scans for PP/CB and PP/CNT microparts and their corresponding blends for Cycle 1 (1st heating cycle), Cycle 2 (cooling cycle), and Cycle 3 (2nd heating cycle) DOI : https://doi.org/10.1515/ipp-2022-4288 En ligne : https://drive.google.com/file/d/1-gV9hbAsnQdBcZoU1O_GQD2XlRxDejjp/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39502 [article]

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