| 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 |
in INTERNATIONAL POLYMER PROCESSING > Vol. 38, N° 2 (2023) . - p. 214-224
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