Anticorrosive epoxy/clay nanocomposite coatings : rheological and protective properties / Milos D. Tomic in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 13, N° 3 (05/2016)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 13, N° 3 (05/2016) . - p. 439-456 Titre : Anticorrosive epoxy/clay nanocomposite coatings : rheological and protective properties Type de document : texte imprimé Auteurs : Milos D. Tomic, Auteur ; Branko Dunjic, Auteur ; Jelena B. Bajat, Auteur ; Violeta Likic, Auteur ; Jelena Rogan, Auteur ; Jasna Djonlagic, Auteur Année de publication : 2016 Article en page(s) : p. 439-456 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Anticorrosifs Anticorrosion Argile Cloisite Dispersions et suspensions Epoxydes Nanoparticules Rhéologie Index. décimale : 667.9 Revêtements et enduits Résumé : The preparation of epoxy/clay nanocomposites (NCs) and their insertion into coatings are of great importance since the NCs could enhance the protective performances. In this study, epoxy NCs with 1–10 wt% of nanoclay Cloisite 30B (C30B) were prepared by the sonication-assisted solution method. The rheological measurements of epoxy/C30B suspensions revealed non-Newtonian, shear-thinning behavior of the uncured NCs, with an increase in the viscosity, yield stress, and shear modules with increasing organoclay content, while the dispersion effectiveness of C30B decreased. A significant enhancement of the rheological parameters was observed at the second percolation threshold (4.1 vol%) due to the formation of a continuous network of 45-layer-thick tactoids. Although NCs with 1–3 wt% C30B exhibited slightly reduced mechanical and adhesion properties compared with the cured reference epoxy resin, the epoxy primer and topcoat based on NC with 1 wt% C30B generally displayed improved impact resistance and maintained flexibility, pendulum hardness, and good adhesion properties. Two-layer coating systems, i.e., NC-based primers and topcoats, had higher corrosion stability in a salt spray chamber compared to the unmodified system. Note de contenu : - EXPERIMENTAL : Materials - Epoxy NCs preparation - Application of epoxy Ncs on steel substrates - Epoxy coatings preparation - Application of epoxy coatings on steel substrates - Sample characterization - RESULTS AND DISCUSSION : Free swelling and rheological properties of the C30B/thinner dispersion - Rheological properties of the uncured epoxy Ncs - Structural characterization of cured epoxy Ncs - Adhesive and mechanical properties of epoxy NCs - Adhesive and mechanical properties of NC-based primer and topcoat - Anticorrosive properties of epoxy coatings DOI : 10.1007/s11998-015-9762-4 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-015-9762-4.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=26285 [article]

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Effect of processing conditions on properties of PET/clay nanocomposite films / H. Ghasemi in INTERNATIONAL POLYMER PROCESSING, Vol. XXVI, N° 2 (05/2011)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XXVI, N° 2 (05/2011) . - p. 219-228 Titre : Effect of processing conditions on properties of PET/clay nanocomposite films Type de document : texte imprimé Auteurs : H. Ghasemi, Auteur ; P. J. Carreau, Auteur ; Musa R. Kamal, Auteur ; N. Chapleau, Auteur Année de publication : 2011 Article en page(s) : p. 219-228 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Argile Cloisite Diffraction des rayons X à grand angle Diffractométrie de rayons X Films plastiques -- Propriétés mécaniques Matériaux hybrides Matériaux hybrides -- Propriétés mécaniques Matières plastiques -- Extrusion:Polymères -- Extrusion Microscopie électronique en transmission Polyéthylène téréphtalate Index. décimale : 668.9 Polymères Résumé : Polyethylene terephthalate (PET) nanocomposite films (with 3 wt.% Cloisite 30B) were prepared by cast extrusion followed by uniaxial stretching, using chill rolls. Two screw profiles with different mixing elements under different screw speeds (N) and feeding rates (Q) were used to prepare PET/clay nanocomposite (PCN) films. Transmission electron microscopy (TEM) and wide angle X-ray diffraction (WAXD) showed that the clay layers were aligned in the machine direction (MD). XRD patterns depicted that the interlayer distance of clay platelets in the state of intercalation is somehow independent of the processing conditions, but the macro-scale characterization, including barrier and mechanical properties, showed that the level of clay layer delamination was affected by processing conditions. The results reveal that the applied strain has stronger effect than residence time on the barrier and mechanical properties. At the highest screw speed (N = 250 min–1), 27% reduction in oxygen permeability and 30% improvement in tensile modulus were obtained for the more severe screw profile. DOI : 10.3139/217.2446 En ligne : https://drive.google.com/file/d/1CvQd5mAo3iMwpC48oYrC2pqX7YbvTjes/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=11526 [article]

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In situ polymerization of PET in the presence of pristine and organo-modified clays / Babak Esmaeili in INTERNATIONAL POLYMER PROCESSING, Vol. XXVIII, N° 3 (07/2013)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XXVIII, N° 3 (07/2013) . - p. 331-340 Titre : In situ polymerization of PET in the presence of pristine and organo-modified clays Type de document : texte imprimé Auteurs : Babak Esmaeili, Auteur ; C. Dubois, Auteur ; P. J. Carreau, Auteur ; M.-C. Heuzey, Auteur Année de publication : 2013 Article en page(s) : p. 331-340 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Argile Cloisite Matériaux hybrides Microscopie électronique à balayage Montmorillonite Oligomères Polycondensation Polyéthylène téréphtalate Polymérisation Silicates Index. décimale : 668.4 Plastiques, vinyles Résumé : In this work two types of montmorillonite, a pristine and an organo-modified clay (Cloisite 30B), were employed to produce (polyethylene terephthalate)-based nanocomposites via in situ polymerization. Using water as an intermediate medium, a stable dispersion of pristine clay in ethylene glycol was achieved. However, after polymerization, no significant gain was obtained in terms of delamination of silicate platelets. The polycondensation reaction when using Cloisite 30B was carried out at a temperature as low as 250 °C in order to retain a considerable portion of the organo-modifier. The results showed that Cloisite 30B was successfully intercalated by the polymer chains, resulting in a d-spacing increase from 1.9 nm to about 3.6 nm. Although some mono and double silicate layers were observed in microscopy images, the major part of the organoclay remained in a tactoid intercalated form. Sampling during the polycondensation reaction revealed that, in this process, clay was first swelled efficiently by the monomer, and this structure was preserved in the early stage of polycondensation. However, the silicate platelets collapsed with time as the polycondensation progressed and larger molecular weight oligomers were formed. An investigation on the type of impeller used in the polymerization process showed that a slight improvement was achieved in terms of aggregate size and distribution when the anchor impeller was replaced by a helical one. Note de contenu : - EXPERIMENTAL : Materials - Experimental set-up - Insitu polymerization procedure - CHARACTERIZATION - RESULTS AND DISCUSSION : Incorporation of pristine clay in the polymerization process - Incorporation of cloisite 30B in the polymerization process - The effect of impeller DOI : 10.3139/217.2760 En ligne : https://drive.google.com/file/d/1NKVQI71S9dtRtWmF9aqWsAS0geFf6Wxb/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=19023 [article]

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Microstructural evolution of PP/EPDM/organoclay nanocomposites in a twin screw extruder / R. Khosrokhavar in INTERNATIONAL POLYMER PROCESSING, Vol. XXVI, N° 2 (05/2011)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XXVI, N° 2 (05/2011) . - p. 212-218 Titre : Microstructural evolution of PP/EPDM/organoclay nanocomposites in a twin screw extruder Type de document : texte imprimé Auteurs : R. Khosrokhavar, Auteur ; Ghasem Naderi, Auteur ; G. R. Bakhshandeh, Auteur ; M. H. R. Ghoreishy, Auteur Année de publication : 2011 Article en page(s) : p. 212-218 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Argile Cloisite Diffractométrie de rayons X Ethylène-propylène-diène monomère Extrudeuse bi-vis Matériaux hybrides Microscopie électronique en transmission Polypropylène Rhéologie Index. décimale : 668.9 Polymères Résumé : The offline Microstructure of nanocomposites based on Poly-Propylene (PP), Ethylene-Propylene Diene Monomer (EPDM) and Cloisite 15A along the twin screw extruder barrel was investigated by X-Ray diffraction, Transmission Electron Microscopy (TEM) and rheological measurements. To assess the effect of screw zones, the microstructural development of nanocomposites along the screw was investigated. Accordingly, dead-stop experiment samples were taken at four different positions of the extruder after abruptly stopping the machine and opening the barrel. Effect of clay loading on the evolution of morphology in the extruder was studied. X-Ray diffraction results showed that at lower clay contents (up to~ 7 wt.%), the intercalation process is independent of screw geometry and accomplishes as soon as the matrix is melted; and on the other hand, excessive melt mixing of the samples containing higher clay loadings (10 wt.%) might lead to the collapse of silicate layers and consequently poor degrees of intercalation/exfoliation. Results were confirmed by TEM micrographs and also XRD patterns of the nanocomposites sensitively detecting the microstructural changes of the samples. DOI : 10.3139/217.2445 En ligne : https://drive.google.com/file/d/1hk4uZSKHI-M41ZOWEmk16v1JCxi6lpmR/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=11525 [article]

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Nanoclay migration and the rheological response of PBAT-LDPE blends / M. Nofar in INTERNATIONAL POLYMER PROCESSING, Vol. 36, N° 3 (2021)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. 36, N° 3 (2021) . - p. 287-296 Titre : Nanoclay migration and the rheological response of PBAT-LDPE blends Type de document : texte imprimé Auteurs : M. Nofar, Auteur ; M. Mohammadi, Auteur ; P. J. Carreau, Auteur Année de publication : 2021 Article en page(s) : p. 287-296 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Alliages polymères Argile Cloisite Energie de surface Morphologie (matériaux) Nanoparticules Polybutylène-adipate-téréphtalate Polyéthylène basse densité Rhéologie Tension superficielle Index. décimale : 668.4 Plastiques, vinyles Résumé : Blends of a poly(butylene adipate-co-terephthalate) (PBAT) and a low density polyethylene (LDPE) (80 wt%/20 wt%) were prepared through a twin screw extruder while incorporating 3 wt% Cloisite 30B (C30B) nanoclay that possessed a much higher affinity with PBAT. The blends were processed through three melt mixing strategies: ( i) direct mixing of all three components, (ii) mixing C30B and PBAT followed by mixing with LDPE, and (iii) mixing C30B and LDPE followed by mixing with PBAT. The rheological properties of each system were determined in small amplitude oscillatory shear (SAOS) experiments. The migration of C30B nanoparticles from the LDPE minor phase towards the PBAT matrix was then monitored in the blend nanocomposites prepared through strategy (iii) via SAOS time sweep experiments. It was firstly understood that the C30B migration could be detected during time sweep SAOS experiments. The migration time was observed to be frequency dependent due to the smaller length scales probed at larger frequencies. Such migration occurred even faster when the SAOS time sweep experiments were conducted at a higher temperature due to the viscosity reduction. Note de contenu : - EXPERIMENTAL : Materials - Melt compounding and blend nanocomposite preparation - Surface energy, interfacial tension, and localization analysis - Morphological analysis - Rheological measurements - RESULTS AND DISCUSSION : Characteristics of neat polymers and c30b localization - Morphological and rheological properties of the blend and blend nanocomposites - Monitoring C30B migration through SAOS experiments - Relationship between nanoparticle migration, applied frequency, and LDPE viscosity DOI : https://doi.org/10.1515/ipp-2020-4057 En ligne : https://drive.google.com/file/d/1XhPD0BX6SWTIUyaH0mkZ-xOdYeN3qEoS/view?usp=shari [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=36371 [article]

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Nanocomposites textiles / Eric Devaux in L'INDUSTRIE TEXTILE, N° 1350 (04/2003)  

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Poly(lactic acid)/acrylonitrile butadiene styrene nanocomposites with hybrid graphene nanoplatelet/organomontmorillonite : effect of processing temperatures / Mohd Bijarimi in INTERNATIONAL POLYMER PROCESSING, Vol. XXXV, N° 4 (08/2020)  

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Processing of polyetherimide/cloisite 30B nanocomposite by vibration casting method / M. Dwivedi in INTERNATIONAL POLYMER PROCESSING, Vol. XXIX, N° 5 (11/2014)  

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Study of mechanical and moisture absorption behavior of epoxy/cloisite-15A nanocomposites processed using twin screw extruder / G. Angadi in INTERNATIONAL POLYMER PROCESSING, Vol. XXXV, N° 3 (07/2020)  

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Synthesis and properties of castor oil-based waterborne polyurethane cloisite 30B nanocomposite coatings / Siva Sankar Pandar in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 14, N° 2 (03/2017)  

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The effect of cloisite Na+ nanoclay filler on the morphology and mechanical properties of loose leather / Sujay Prabakar in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXI, N° 5 (05/2016)  

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The use of apparent yield stress to characterize exfoliation in polymer nanocomposites / Bruno Vergnes in INTERNATIONAL POLYMER PROCESSING, Vol. XXVI, N° 2 (05/2011)  

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