Accueil
Détail de l'auteur
Auteur Naser Sharifi-Sanjani |
Documents disponibles écrits par cet auteur
Ajouter le résultat dans votre panier Affiner la recherche
Improving the rheology of linear low-density polyethylene (LLDPE) and processability of blown film extrusion using a new binary processing aid / Sarah Ramezan-Nejad in INTERNATIONAL POLYMER PROCESSING, Vol. 38, N° 3 (2023)
[article]
Titre : Improving the rheology of linear low-density polyethylene (LLDPE) and processability of blown film extrusion using a new binary processing aid Type de document : texte imprimé Auteurs : Sarah Ramezan-Nejad, Auteur ; Somayeh Mohamadi, Auteur ; Naser Sharifi-Sanjani, Auteur Année de publication : 2023 Article en page(s) : p. 310-321 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Hydrocalumite
Polyéthylène basse densité linéaire
Polyéthylène glycol
RhéologieIndex. décimale : 668.4 Plastiques, vinyles Résumé : To improve the processability of LLDPE, a binary processing aid composed of polyethylene glycol (PEG) and hydrocalumite was designed. Hydrocalumite containing HPO32− was successfully synthesized with co-precipitation of calcium and aluminum hydroxide in the presence of phosphorous acid. Scanning Electron Microscopy (SEM), Fourier-transform infrared (FTIR) spectroscopy, Thermogravimetric analyses (TGA) and Ion chromatography were utilized for the characterization of the synthesized hydrocalumite. SEM images showed the layered structure. Ion Chromatography demonstrated the molar ratio of Ca2+/Al3+ was 2:1.3 as an interlayer ion. The influence of PEG/hydrocalumite with the different ratios as a processing aid on the rheological properties of LLDPE was investigated by capillary rheometry. The results obtained showed that PEG/hydrocalumite processing aid with a ratio of 1:3 exhibited the best effect on the reduction of critical stress due to the best coverage of the extruder surface. The measurement of processing parameters in the blown film extruder revealed that hydrocalumite interacted with metallic oxides, created a slippery film layer on the die wall. This leads to a decrease in the die pressure and power consumption by 11% and 21%, respectively. SEM analysis confirmed a delay in Sharkskin instability at a higher shear rate. Note de contenu : - Materials
- Synthesis of hydrocalumite
- Samples preparation
- Characterization
- Table 1 : Critical shear stress for various LLDPE compounds
- Table 2 :Tensile properties of LLDPE and LLDPE/MIPA compoundDOI : https://doi.org/10.1515/ipp-2022-4309 En ligne : https://drive.google.com/file/d/1AFO46DiKuAhy98UhZzVN0RVC9NJts0u2/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39694
in INTERNATIONAL POLYMER PROCESSING > Vol. 38, N° 3 (2023) . - p. 310-321[article]Réservation
Réserver ce document
Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité 24318 - Périodique Bibliothèque principale Documentaires Disponible Preparation of poly(acrylic acid)-poly(ethylene oxide) nanofibers via electrospinning and investigation of their morphology / Z. Shami in INTERNATIONAL POLYMER PROCESSING, Vol. XXVI, N° 4 (09/2011)
[article]
Titre : Preparation of poly(acrylic acid)-poly(ethylene oxide) nanofibers via electrospinning and investigation of their morphology Type de document : texte imprimé Auteurs : Z. Shami, Auteur ; Naser Sharifi-Sanjani, Auteur Année de publication : 2011 Article en page(s) : p. 361-367 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Alliages polymères
Analyse thermique
Electrofilature
Fourier, Spectroscopie infrarouge à transformée de
Morphologie (matériaux)
Nanofibres
Polyacryliques
Polyéthylène glycol
Spectrophotométrie UV-Visible
ThermogravimétrieIndex. décimale : 668.9 Polymères Résumé : The poly(acrylic acid)/poly(ethylene oxide) (PAA/PEO) blend nanofibers at 100/0, 80/20, 50/50, 20/80 and 0/100 weight ratios were obtained via electrospinning process. Intermolecular interactions, miscibility and compatibility of polymer blends were studied by Fourier transform infrared (FT-IR), differential scanning calorimetry (DSC), thermogravimetric analysis (TGA) and UV-visible spectrophotometer. The results suggest that intermolecular interactions have occurred between pure PAA and PEO in PAA/PEO blend. These interactions made PAA/PEO blend miscible at above-mentioned weight ratios. Additionally, the morphology and the fibers diameter were investigated using scanning electron microscope (SEM) analysis, which indicated beadless fibers with diameter range of about 120 to 300 nm. It was observed that the homogenous nanofibers with the smaller diameter were obtained in PAA/PEO blend with PAA dominant content. Finally, SEM results suggest that the formation of pure PAA nanofibers with concentration of 5.0 wt.% would not occur. Whereas, in the same concentration, pure PEO and PAA/PEO blend nanofibers with no bead defects were obtained. However, in higher pure PAA concentrations electrospun fibers were formed. DOI : 10.3139/217.2336 En ligne : https://drive.google.com/file/d/1Tv0EPvdRnzdz6W1A6xbQbICw7KhNxc_0/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=12433
in INTERNATIONAL POLYMER PROCESSING > Vol. XXVI, N° 4 (09/2011) . - p. 361-367[article]Réservation
Réserver ce document
Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité 013208 - Périodique Bibliothèque principale Documentaires Disponible