Coating properties of 1H,1H-perfluorooctylamine-terminated polyimides based on hexafluoroisopropylidene diphthalic anhydride and 1,4,5,8 naphthalenetetracarboxylic dianhydride / Mustafa Cakir in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 16, N° 3 (05/2019)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 16, N° 3 (05/2019) . - p. 699-710 Titre : Coating properties of 1H,1H-perfluorooctylamine-terminated polyimides based on hexafluoroisopropylidene diphthalic anhydride and 1,4,5,8 naphthalenetetracarboxylic dianhydride Type de document : texte imprimé Auteurs : Mustafa Cakir, Auteur ; Emre Akin, Auteur ; Recep Artir, Auteur Année de publication : 2019 Article en page(s) : p. 699-710 Note générale : Bibliogr. Langues : Américain (ame) Catégories : 1,4,5,8-dianhydride de naphtalène tétracarboxylique Composés organiques Essai de dureté Essais de résilience Essais dynamiques Hydrophobie Polyimides Résistance à l'abrasion Revêtements organiques Stabilité thermique Index. décimale : 667.9 Revêtements et enduits Résumé : This study attempted to prepare polyimide coatings (PIs) containing 6FDA (hexafluoroisopropylidene diphthalic anhydride) and/or NTDA (1,4,5,8 naphthalenetetracarboxylic dianhydride) in various ratios. 1% of these polyimide chains were terminated with 1H,1H-perfluorooctylamine (PFOA) and PFOA, and terminated polyimide coatings (PIFs) were prepared in the same ratios as PIs. Coatings were produced on aluminum substrates by a 75-μm wire-wound applicator and thermally imidized. Finally, thermal, wear, and physical properties of PIFs and PIs were compared to each other. PIFs exhibited higher abrasion resistance than PIs due to the presence of PFOA. The increase in 6FDA content also resulted in elevated abrasion resistance. Both NTDA and 6FDA compounds improved thermal stability. The increase in NTDA content raised the Tg values of the polyimides. PIFs exhibited higher static water contact angle values than PIs, but the existence of microcracks decreased their hydrophobicity. The gloss values of PIFs were excellent. Improved values were obtained for pencil hardness, crosscut adhesion, and MEK (methyl ethyl ketone) rubbing properties for all coatings. In addition to the pencil hardness test, a pendulum hardness test was also carried out. The presence of PFOA affected pendulum hardness values positively, and the increase in the amount of 6FDA on polymer backbone improved the pendulum hardness values despite the rigidity of NTDA. Note de contenu : - Materials - Synthesis of polyimides coatings - Measurements DOI : 10.1007/s11998-018-0147-3 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-018-0147-3.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=32583 [article]

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Wear, thermal, corrosion, and physical properties of novel UV-cured nanocomposite hybrid coatings with fluorine-containing silica networks / Mustafa Cakir in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 21, N° 4 (07/2024)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 21, N° 4 (07/2024) . - p. 1343-1360 Titre : Wear, thermal, corrosion, and physical properties of novel UV-cured nanocomposite hybrid coatings with fluorine-containing silica networks Type de document : texte imprimé Auteurs : Mustafa Cakir, Auteur ; Emre Akin, Auteur ; Kerim Günsay, Auteur ; Recep Artir, Auteur Année de publication : 2024 Article en page(s) : p. 1343-1360 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Copolymère époxy acrylate Diaminodiphénylsulfone Dioxyde de silicium Fluor Matériaux hybrides Revêtements -- Séchage sous rayonnement ultraviolet Revêtements organiques Index. décimale : 667.9 Revêtements et enduits Résumé : This paper presents novel organic-inorganic (hybrid) nanocomposite coatings (EASFs) containing a diamino diphenyl sulfone (DDS)-based structure with fluorine chains and SiO2 networks. To obtain these nanocomposites, a diamino diphenyl sulfone (DDS)-based structure (SFDDS) containing silane terminated fluorine chains was synthesized. This structure was converted to a novel precursor (SFDDS precursor) by adding hydrolyzed tetraethoxysilane (TEOS) and trimethylsiloxy propyl methacrylate (MEMO) by the sol-gel method. This way, SFDDS precursor was obtained and incorporated into a mixture of epoxy acrylate and 1,6-hexanediol diacrylate reactive resin system in the range of 2.5-15%. The prepared solutions were spread onto low-carbon steel with a 75 μm wire-wound applicator instrument and cured by UV light. These coating samples were characterized in terms of their thermal, wear, physical, and corrosion properties. Considering physical properties, while hydrophobicity and scratch resistance presented substantial increases, adhesion and brightness properties decreased. The adhesion properties of EASF10 and EASF12.5 were fairly good, but their wear resistance values showed decreases at these adhesion levels. Glass transition temperatures increased with an increase in the SFDDS precursor content. This situation showed that these novel hybrid nanocomposite coatings could have higher thermo-mechanical properties. Besides these results, the corrosion resistance values of these novel hybrid nanocomposite coating materials were noteworthy. While the corrosion resistance results of these novel coatings were enhanced substantially in the air atmosphere, the NaCl atmosphere adversely affected corrosion resistance. Note de contenu : - Materials - The synthesis - Preparation of fluorine chains and SiO2 networks containing novel hybrid nanocomposite coatings - Measurements - Table 1 : Physical properties of EASFs - Table 2 : Glass transition temperature values of EASFs - Table 3 : Taber abrasion results of EASFs - Table 4 : Comparison of the properties of the prominent DDS-based novel structure containing nanocomposite coatings (EASFs) in this study to properties reported in similar prominent studies in the literature DOI : https://doi.org/10.1007/s11998-023-00897-x En ligne : https://drive.google.com/file/d/1kiBqbPqB28yvRZhC-gpl40PMQ0wWOzsd/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=41302 [article]

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