Extrusion blow molding of polymeric blends based on thermotropic liquid crystalline polymer and high density polyethylene / C. Qian in INTERNATIONAL POLYMER PROCESSING, Vol. XXXII, N° 1 (03/2017)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XXXII, N° 1 (03/2017) . - p. 112-120 Titre : Extrusion blow molding of polymeric blends based on thermotropic liquid crystalline polymer and high density polyethylene Type de document : texte imprimé Auteurs : C. Qian, Auteur ; C. D. Mansfield, Auteur ; D. G. Baird, Auteur Année de publication : 2017 Article en page(s) : p. 112-120 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Alliages polymères Alliages polymères -- propriétés mécaniques Anhydride maléique Bouteilles en matières plastiques Cristaux liquides thermotropes Matières plastiques -- Moulage par extrusion-soufflage Morphologie (matériaux) Polyéthylène haute densité Polymères cristallins Stabilité thermique Viscosimétrie Index. décimale : 668.4 Plastiques, vinyles Résumé : This work is concerned with the extrusion blow molding of polymeric blends containing thermotropic liquid crystalline polymer (TLCP) and high density polyethylene (HDPE), using a single screw extruder. The TLCP is synthesized from terephthalic acid, 4-hydroxybenzoic acid, hydroquinone and hydroquinone derivatives, the melting point of which is 280 °C. Because the TLCP is usually processed at much higher temperatures than HDPE, the thermal stability of HDPE at elevated temperature is evaluated. It is shown that HDPE is relatively stable in the processing temperature range of the TLCP used in this work (260 to 300 °C). Bottles are successfully produced from the blends containing 10, 20 and 50 wt% TLCP. The TLCP/HDPE blend bottles exhibit enhanced modulus relative to pure HDPE. However, the improvement in tensile strength is marginal. At 10 and 20 wt% TLCP contents, the TLCP phase exists as platelets aligning along the machine direction, while a co-continuous morphology is observed for the blend containing 50 wt% TLCP. To further enhance the mechanical properties of the blends, the preliminary effectiveness of maleic anhydride grafted HDPE (MA-g-HDPE) as a compatibilizer is studied. The injection molded ternary blends of TLCP/HDPE/MA-g-HDPE have demonstrated superior mechanical properties over the binary TLCP/HDPE blends, which suggests MA-g-HDPE as a potential compatibilizer for developing high performance TLCP/HDPE containers with enhanced mechanical properties. Note de contenu : - EXPERIMENTAL : Materials - Thermal stability measurements of HDPE - Melt compounding of the TLCP/HDPE blends - Viscosity measurements - Extrusion blow molding of the TLCP/HDPE blends - Injectionmolding of the ternary TLCP/MA-GHDPE/HDPE blends - Tensile properties - Morphological characterization - RESULTS AND DISCUSSION : Thermal stability of HDPE - Viscosity scheme of the TLCP/HDPE blends - Mechanical properties of the TLCP/HDPE bottles - Morphology of blow molded TLCP/HDPE bottles - Mechanical properties of the ternary TLCP/HDPE/MA-G-HDPE blends DOI : 10.3139/217.3293 En ligne : https://drive.google.com/file/d/1r_T4Ppz_MyY6lu4J3cG9VsCR219sMdT_/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=28007 [article]

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