Eco-friendly protective coatings based on poly(urethane sulfone amide) dispersions for carbon steel / H. A. Mohamed in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 14, N° 2 (03/2017)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 14, N° 2 (03/2017) . - p. 437-446 Titre : Eco-friendly protective coatings based on poly(urethane sulfone amide) dispersions for carbon steel Type de document : texte imprimé Auteurs : H. A. Mohamed, Auteur ; S. M. M. Morsi, Auteur ; B. M. Badran, Auteur ; A. M. Rabie, Auteur Année de publication : 2017 Article en page(s) : p. 437-446 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Acier au carbone Anticorrosifs Anticorrosion Copolymère uréthane sulfone amide Dispersions et suspensions Métaux -- Revêtements protecteurs Polyuréthanes Index. décimale : 667.9 Revêtements et enduits Résumé : Eight eco-friendly protective coatings (PU, PUA1, PUA3, PUA5, T30PUA5, T60PUA5, T90PUA5, and T120PUA5), were formulated based on series of laboratory-synthesized poly(urethane co-sulfone amide) copolymer dispersions (CPDs) as binders. The first four formulations were based on CPDs prepared by the copolymerization reaction of PU based on castor oil (CO) with aromatic polyamide sulfone (APAS) in four different concentrations (0%, 1%, 3%, and 5% solid to solid). The other four formulations were based on CPDs synthesized by the copolymerization reaction of PU based on transesterified CO with triethanolamine (CON) at different time intervals (30, 60, 90, and 120 min) with APAS at only one concentration. The effect of the degree of copolymerization and transesterification reactions on the physical, chemical, and mechanical properties of the formulated coatings was studied. The results showed that the copolymerization and transesterification reactions led to an increase in the density and viscosity of the coating formulations. Additionally, the hardness of the dried films increased with copolymerization and transesterification reactions. The transesterification reaction decreased the adhesion force of the coated films. The copolymerization process caused a decrease in the water uptake of the coated films. However, the transesterification reaction increased the water uptake. The prepared formulations were applied on carbon steel substrates to estimate their efficiency as eco-friendly protective coatings for steel. The weight loss of the coated steel panels decreased with an increase in the amount of the copolymerized APAS within the PU chains, while it increased with an increase in the transesterification time of the CON used in the preparation of the coated copolymers. From the corrosion test results, PUA5 and T30PUA5 showed the best anticorrosive performance as estimated from the degree of rusting, weight loss measurements, and failure at scribe. DOI : 10.1007/s11998-016-9861-x En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-016-9861-x.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=28158 [article]

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Polypyrrole-coated latex particles as core/shell composites for antistatic coatings and energy storage applications / S. M. M. Morsi 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. 745-759 Titre : Polypyrrole-coated latex particles as core/shell composites for antistatic coatings and energy storage applications Type de document : texte imprimé Auteurs : S. M. M. Morsi, Auteur ; M. E. Abd El-Asis, Auteur ; R. M. M. Morsi, Auteur ; A. I. Hussain, Auteur Année de publication : 2019 Article en page(s) : p. 745-759 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Antistatiques Copolymères Core-Shell Energie -- Stockage Latex Polymérisation en émulsion Polypyrroles Revêtements -- Analyse Revêtements organiques Index. décimale : 667.9 Revêtements et enduits Résumé : Antistatic coatings based on latexes of core/shell composites were prepared from poly(styrene-co-butyl acrylate-co-acrylamide-co-acrylic acid) (PSBAA) core and polypyrrole (PPy) shell. PSBAA was prepared by semicontinuous seeded emulsion polymerization in a typical process to that implemented in the industrial scale. The copolymer-emulsified particles were surface-modified by in situ polymerization of 2 and 10 wt% pyrrole to PSBAA solid to yield PSBAA/2PPy and PSBAA/10PPy composites, respectively. The purpose of this modification is to enhance the electrical properties of PSBAA particles, thus preventing the buildup of static electricity on their coatings. The composites were characterized by FTIR, DSC, TGA, XRD, DLS, TEM, SEM, and EDX. The mechanical, antistatic, and dielectric properties of the coatings were determined. The volume resistivity of PSBAA/2PPy and PSBAA/10PPy composites was 2.60 × 109 and 1.2 × 107 Ω.cm, respectively, that is, proper to act as antistatic coatings. AC conductivity (σac) measurements showed that the modification of PSBAA transferred it from insulator material with σac 1.83 × 10−10 S/cm to semiconducting material PSBAA/10PPy with σac 8.33 × 10−8. The increase in dielectric constant from 0.73 in PSBAA to 149.90 in PSBAA/10PPy indicates that the prepared composites represent promising candidates to be used as energy storage materials in electronic devices. Note de contenu : - EXPERIMENTAL : Materials - Methodology - Characterization techniques - RESULTS AND DISCUSSION : FTIR analysis - TGA analysis - DSC analysis - XRD analysis - TEM images - SEM photographs - EdX analysis - AFM analysis - DLS analysis - Electrical properties DOI : 10.1007/s11998-018-00152-8 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-018-00152-8.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=32587 [article]

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