Against the current / Sarah Luers in KUNSTSTOFFE INTERNATIONAL, Vol. 112, N° 4 (2022)  

[article]  inKUNSTSTOFFE INTERNATIONAL > Vol. 112, N° 4 (2022) . - p. 54-57 Titre : Against the current : How suitable are PA and PBT for high-voltage applications ? Type de document : texte imprimé Auteurs : Sarah Luers, Auteur ; Stefan Theiler, Auteur Année de publication : 2022 Article en page(s) : p. 54-57 Langues : Anglais (eng) Catégories : Composites à fibres de verre Humidité -- Absorption Matières plastiques dans les automobiles Polyamide 6 Polyamide 66 Polyamides Un polyamide est un polymère contenant des fonctions amides -C(=O)-NH- résultant d'une réaction de polycondensation entre les fonctions acide carboxylique et amine. Selon la composition de leur chaîne squelettique, les polyamides sont classés en aliphatiques, semi-aromatiques et aromatiques. Selon le type d'unités répétitives, les polyamides peuvent être des homopolymères ou des copolymères. Polybutylène téréphtalate Résistance électrique Température Index. décimale : 668.4 Plastiques, vinyles Résumé : Electromobility in particular, but also many other electrical applications, are asking for ever higher demands regarding the electrical properties of thermoplastics. This raises the question of whether the polymers commonly used in this area can still meet these demands. The plastics manufacturer, Lanxess, has now investigated how suitable, for example, polyamide and polybutylene terephthalate are for use at higher voltages and temperatures. Note de contenu : - More stringent demands, particularly in electromobility - Temperature influences the volume resistivity - Is the high moisture absorption of PA a problem ? - High electric strength, smaller components - High tracking resistance becoming increasingly important - CTI measurements at above 600 V make no sense - Guideline for component design at higher voltages - Fig. 1 : High-voltage connectors are a typical application for PA6, PA66 and PBT compounds - Fig. 2 ; Temperature dependence of the volume resistivity of glass fiber-reinforced PA6 and PBT compounds: the volume resistivity of PBT drops less sharply than that of polyamide at higher temperatures - Fig. 3 : Dependence of the volume resistivity on the moisture content, taking the example of a PA6-GF30 (Durethan BKV30H3.0) : the higher the moisture content, the lower the resistivity. The volume resistivity after moisture absorption drops more sharply at room temperature than at higher temperatures - Fig. 4 : Temperature dependence of the electric strength of glass fiber-reinforced PA6 and PBT compounds : PBT exhibits practically no change over the whole temperature range. With PA, however, a significant drop is to be observed above approx. 80 °C - Fig. 5 : Dependence of the electric strength on the specimen thickness for a PA6-GF30 (Durethan BKV30H3.0) at room temperature: the electric strength decreases sharply with increasing thickness. This is attributable in particular to the better heat dissipation with small wall thicknesses - Table 1 : Typical CTI values for compounds of PA6, PA66 and PBT En ligne : https://drive.google.com/file/d/1sKExsJQFxgpteLnaynqW-cjLy44guW7v/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37970 [article]

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