Flexible sheet molding compound (SMC) using aliphatic polyester as cross linker / M. Esfandeh in INTERNATIONAL POLYMER PROCESSING, Vol. XVIII, N° 2 (06/2003)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XVIII, N° 2 (06/2003) . - p. 166-170 Titre : Flexible sheet molding compound (SMC) using aliphatic polyester as cross linker Type de document : texte imprimé Auteurs : M. Esfandeh, Auteur ; M. R. Ebrahimi, Auteur Année de publication : 2003 Article en page(s) : p. 166-170 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 668.9 Polymères Résumé : Thermoset resins are brittle and have a poor resistance to crack initiation and growth. This is attributed to their amorphous and highly cross-linked structure. In composite parts made from thermoset molding compositions such as Sheet Molding Compound (SMC) and Bulk Molding Compound (BMC), the initial stage of composite failure is attributed to the properties of the polyester based resin. Thus, improving resin properties by adding various additives has been an interesting area of research. In this work, Maleic anhydride-terminated polycaprolactone (MATPCL) was used to modify the flexural properties of unsaturated polyester (UP) resin. MATPCL was prepared in the lab and was added to UP at 3, 5, 10, 20, 40 and 50 percent by weight. Mechanical properties of the cured samples (flexural and impact strength) were determined and an almost linear increase in impact properties was observed with increasing the MATPCL content. Phase behavior of UP/MATPCL blends was inspected both visually and using scanning electron microscopy and, no gross phase separation was seen at the levels used. SMC was prepared in conventional method using chopped glass fibers and the resin formulation having 20 wt% of MATPCL. Thickening behavior, molding characteristics, mechanical properties and fracture behavior of the prepared sheets were determined and compared with the sheets made from non-modified UP resin. DOI : 10.3139/217.1739 En ligne : https://drive.google.com/file/d/1_E_QyRmTIJFZQLuGLk21vm05fE6MgQqU/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=3307 [article]

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Investigating the role of surface treated titanium dioxide nanoparticles on self-cleaning behavior of an acrylic facade coating / S. Pazokifard in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 10, N° 2 (03/2013)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 10, N° 2 (03/2013) . - p. 175-187 Titre : Investigating the role of surface treated titanium dioxide nanoparticles on self-cleaning behavior of an acrylic facade coating Type de document : texte imprimé Auteurs : S. Pazokifard, Auteur ; M. Esfandeh, Auteur ; Seyed Mojtaba Mirabedini, Auteur ; Mohsen Mohseni, Auteur ; Z. Ranjbar, Auteur Année de publication : 2013 Article en page(s) : p. 175-187 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Dioxyde de titane Essais accélérés (technologie) Greffage (chimie) Nanoparticules Photocatalyse Photodétérioration Polyacryliques Revêtement auto-nettoyant:Peinture auto-nettoyante Revêtements Rhodamine Silice La silice est la forme naturelle du dioxyde de silicium (SiO2) qui entre dans la composition de nombreux minéraux. La silice existe à l'état libre sous différentes formes cristallines ou amorphes et à l'état combiné dans les silicates, les groupes SiO2 étant alors liés à d'autres atomes (Al : Aluminium, Fe : Fer, Mg : Magnésium, Ca : Calcium, Na : Sodium, K : Potassium...). Les silicates sont les constituants principaux du manteau et de l'écorce terrestre. La silice libre est également très abondante dans la nature, sous forme de quartz, de calcédoine et de terre de diatomée. La silice représente 60,6 % de la masse de la croûte terrestre continentale. Index. décimale : 668.4 Plastiques, vinyles Résumé : In this study, the addition of silane treated TiO2 nanoparticles on the self-cleaning properties of an acrylic facade coating was evaluated. Tetraethoxyorthosilicate, TEOS, was used for surface treatment of TiO2 nanoparticles. The silica grafting on the TiO2 nanoparticles was characterized via Fourier Transform Infrared spectroscopy, specific surface area measurement, pore size distribution, and real density measurements. The effect of surface treatment and content of nanoparticles on the photocatalytic activity of acrylic coating and self-cleaning properties was studied. For this purpose, the photodegradation of Rhodamine B (Rh.B) dyestuff, as a colorant model, was investigated by colorimetric technique, while the coating samples were exposed to UVA irradiation. Performance of the acrylic coating films was evaluated by gloss change during accelerated weathering conditions. Also, the surface morphology of the coating films was studied using SEM analysis. The results showed that the addition of both treated and untreated TiO2 nanoparticles provides self-cleaning property to the acrylic coatings. However, silica surface treatment of TiO2 nanoparticles reduces the coating degradation caused by TiO2. This is more evident when higher concentrations of the treated TiO2 nanoparticles are used. Note de contenu : - EXPERIMENTAL : Materials - Silanization of TiO2 nanoparticles - Surface characterization of the treated TiO2 - Preparation of acrylic coatings - Dispersion of TiO2 nanoparticles in the coatings - Colorimetric study of Rh.B degradation - Durability of the coatings - RESULTS AND DISCUSSION : Characterization of silica treated TiO2 nanoparticles - Dispersion of nanoparticles in the coatings - Photocatalytic activity studies - Self-cleaning property - Coating durability DOI : 10.1007/s11998-012-9428-4 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-012-9428-4.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=18236 [article]

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