Application of the experimental results to the modified Halpin-Tsai micromechanical model to evaluate the clay dispersion in clay-reinforced polyethylene nanocomposites / N. Uyanik in INTERNATIONAL POLYMER PROCESSING, Vol. XXIX, N° 1 (03/2014)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XXIX, N° 1 (03/2014) . - p. 28-34 Titre : Application of the experimental results to the modified Halpin-Tsai micromechanical model to evaluate the clay dispersion in clay-reinforced polyethylene nanocomposites Type de document : texte imprimé Auteurs : N. Uyanik, Auteur Année de publication : 2014 Article en page(s) : p. 28-34 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Argile Copolymères greffés Dispersions et suspensions Essais dynamiques Itaconate de monométhyle Itaconique, Acide Matériaux hybrides Micromécanique (physique du solide) Montmorillonite Polyéthylène basse densité Polyéthylène basse densité linéaire Traction (mécanique) Index. décimale : 668.4 Plastiques, vinyles Résumé : Low-density polyethylene (LDPE)- and linear low-density polyethylene (LLDPE)-based polymer nanocomposites (PNC) containing organically modified montmorillonite (MMT) were prepared by melt mixing process. Itaconic acid (IA) and monomethyl itaconate (MMI) grafted polyethylene (PE) were used as compatibilizers. Na-MMT was modified by dodecyl-, hexadecyl-, and octadecyl-ammonium chlorides and then the compatibilizers were synthesized in solution reaction. 5 wt% organoclay and different concentration of compatibilizers (5, 10, and 15 wt%) were used for the PNC preparations to compare the effects of compatibilizers. The interlayer spacings, d001, and the mechanical properties of samples were measured by XRD analysis and universal testing machine, respectively. The experimental tensile moduli were used in Halpin-Tsai micro mechanical model to obtain "l/t" ratios and the results were compared experimental d001 values obtained from XRD data. It was found that the experimental results are in good agreement with the calculated results. Note de contenu : - Materials - Analyses and characterizations - Preparation of nanocomposites - Calculation methods DOI : 10.3139/217.2797 En ligne : https://drive.google.com/file/d/1MZvk_r77JHArJ_7ztxoqUozjEAu2kK8r/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=20572 [article]

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Studies on thermal and morphological characteristics of siloxane containing epoxy resins cured by microwave radiation / N. Uyanik in SURFACE COATINGS INTERNATIONAL. PART B : COATINGS TRANSACTIONS, Vol. 87, B2 (06/2004)  

[article]  inSURFACE COATINGS INTERNATIONAL. PART B : COATINGS TRANSACTIONS > Vol. 87, B2 (06/2004) . - p. 91-96 Titre : Studies on thermal and morphological characteristics of siloxane containing epoxy resins cured by microwave radiation Type de document : texte imprimé Auteurs : N. Uyanik, Auteur ; C. Erbil, Auteur ; M. Karadayi, Auteur Année de publication : 2004 Article en page(s) : p. 91-96 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Caractérisation Copolymère silicone acrylate Epoxydes Micro-ondes Microscopie électronique à balayage Revêtements -- Séchage sous rayonnement ultraviolet Revêtements organiques Index. décimale : 667.9 Revêtements et enduits Résumé : Microwave radiation was performed on a diglycidyl ether of a bisphenol-A type epoxy monomer with an aliphatic polyamino-curing agent. The ratio of epoxy monomer to curing agent was taken as 2. Two different molecular weights of silicone acrylates were used in various ratios for the modification of the system. The mechanical characterisation and hardness measurements of these samples were performed. As the siloxane content in the epoxy resin system was increased, Young’s modulus and hardness decreased. Further, the strength at Fmax, toughness and percentage elongation showed a maximum of about 10% for one kind of PDMS containing epoxy system. Thermal characterisations of the samples were determined with a thermogravimetric analyzer. The decomposition of the samples was a two-stage process with maximum weight loss rates in between 320 to 400°C or 330 to 430°C°C, depending on the molecular weights of PDMS modifier. The SEM photographs of the cold-fractured samples were taken. As the siloxane content in the epoxy resins was increased, the fractured surfaces became rougher and showed more irregular stripes in the matrix. Note de contenu : - EXPERIMENTAL : Materials - Analyses and methods - Preparation of the epoxy films - RESULTS AND DISCUSSION : Mechanical characterisation of the epoxy films - Thermal characterisation of the epoxy films - Morphology of the epoxy films - Table 1 : Preparation conditions of epoxy resins - Table 2 : Average results of the film samples containing PDMS V-Si 21 - Table 3 : Average results of the film samples containing PDMS V-Si 22 - Table 4 : Average results of shore D hardness of the samples DOI : 10.1007/BF02699602 En ligne : https://link.springer.com/content/pdf/10.1007/BF02699602.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=5468 [article]

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