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Trialkoxylane grafting onto nanoparticles for the preparation of clear coat polyacrylate systems with excellent scratch performance / Tushar Bhosle in PAINTINDIA, Vol. LX, N° 7 (07/2010)
[article]
Titre : Trialkoxylane grafting onto nanoparticles for the preparation of clear coat polyacrylate systems with excellent scratch performance Type de document : texte imprimé Auteurs : Tushar Bhosle, Auteur Année de publication : 2010 Article en page(s) : p. 57-64 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Matériaux hybrides
Nanoparticules
Polyacrylates
Résistance à l'abrasion
Silanes
SiliconesLes silicones, ou polysiloxanes, sont des composés inorganiques formés d'une chaine silicium-oxygène (...-Si-O-Si-O-Si-O-...) sur laquelle des groupes se fixent, sur les atomes de silicium. Certains groupes organiques peuvent être utilisés pour relier entre elles plusieurs de ces chaines (...-Si-O-...). Le type le plus courant est le poly(diméthylsiloxane) linéaire ou PDMS. Le second groupe en importance de matériaux en silicone est celui des résines de silicone, formées par des oligosiloxanes ramifiés ou en forme de cage (wiki).
VernisTags : 'Revêtement résistant aux rayures' 'Polyacrylate nanocomposites' Méthacryloxypropyltriméthoxysilane MEMO PTMO VTMO Nanocomposites Polysiloxanes Trialkoxysilane Index. décimale : 667.9 Revêtements et enduits Résumé : Transparent reinforced polyacrylates were prepared using nanosized filer particles with radiation-curable acrylates. To improve embedding of the nanofillers within the acrylate matrix the filler surface was chemically modified. This modification of the silica and alumina nanoparticles was accomplished by trimethoxylanes having methacryloxypropyl (MEMO), vinyl (VTMO), and n-propyl (PTMO) functionalities. Due to acid catalyzed condensation of organosilanes a polysiloxane shell was formed around the nanoparticles. This shell is bonded to OH groups on the filler surface. The appearance of covalent Si-O-Si-R bonds was clearly shown by multinuclear MAS NMR. MALDI-TOF mass spectroscopy revealed the formation of polysiloxane oligomers with different degrees of condensation. In the work presented, an acrylate-nanocomposite formulation contains up to 35 wt.% nanosized silica covered with polysiloxanes. For MEMO modification, surface-anchored methacryl gropus can copolymerize with network acryaltes. But also PTMO-modified composite materials exhibit markedly improved improved properties as compared to the neat acrylate polymer ; e.g., an increased modulus and heat resistance, improved scratch and abrasion resistance. This makes polyacrylate nanocomposites a very promising new coating technology for many far reaching technical applications. Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=9841
in PAINTINDIA > Vol. LX, N° 7 (07/2010) . - p. 57-64[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 012410 - Périodique Bibliothèque principale Documentaires Disponible Cycloaliphatic epoxide crosslinkable core-Shell latexes / Mark D. Soucek in JOURNAL OF COATINGS TECHNOLOGY (JCT), Vol. 73, N° 921 (10/2001)
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Titre : Cycloaliphatic epoxide crosslinkable core-Shell latexes : A new strategy for waterborne epoxide coatings Type de document : texte imprimé Auteurs : Mark D. Soucek, Auteur ; Ganghua Teng, Auteur ; Shoabing Wu, Auteur Année de publication : 2001 Article en page(s) : p. 117-125 Note générale : Bibliogr. Langues : Américain (ame) Tags : 'Matériau revêtement' 'Peinture phase aqueuse' émulsion' Formulation Liant 'Résine époxyde' 'Polymère réticulé' Latex 'Polyméthacrylate méthyle' 'Polyacrylate butyle' hydroxyéthyle' 'Acide méthacrylique' Préparation 'Etude expérimentale' 'Particule core shell' Index. décimale : 667.9 Revêtements et enduits Résumé : New core-shell acrylic latexes designed for crosslinking with cycloaliphatic diepoxides were prepared. The core consisted of methyl methacrylate (MMA), butyl acrylate (BA), 2-hydroxyethyl methacrylate (HEMA), and the shell MMA, BA, and methacrylic acid (MAA). A strong acid acrylate was incorporated into the shell to catalyze the crosslinking reactions. The diepoxide crosslinker was introduced into the latex formulation via three methods: (1) added with the monomers during the polymerization of the latex, (2) added after the preparation of the latex in an organic solvent, and (3) added as a separate emulsion. The stability of epoxide was shown to be dependent on latex morphology, initiator system, and reaction conditions. Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=5766
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Code-barres Cote Support Localisation Section Disponibilité 001229 - Périodique Bibliothèque principale Documentaires Disponible Novel chlorinated film formers for high performance coatings / S. Bhandari in PAINTINDIA, Vol. XLV, N° 7 (07/1995)
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Titre : Novel chlorinated film formers for high performance coatings Type de document : texte imprimé Auteurs : S. Bhandari, Auteur ; S. Chandra, Auteur Année de publication : 1995 Article en page(s) : p. 19-35 Note générale : Bibliogr. Langues : Anglais (eng) Tags : Peinture Liant 'Polymère chlore' 'Résine alkyde' Préparation Chloration 'Huile soja' 'Corps gras végétal' époxyde' 'Polyacrylate de butyle' 'Copolymère acrylate méthacrylate méthyle' 'Propriété thermique' mécanique' chimique' Feuil 'Article synthèse' Index. décimale : 667.9 Revêtements et enduits Résumé : Chlorinated alkyds, epoxy esters and butyl acrylate-méthyl methacrylate (BA-MMA) copolymers were synthesised by bubbling dry chlorine gas in carbon tetrachloride solution. The chlorination of DCO alkyd was studied both in the absense as well as in the presence of iodine catalyst. Soybean and nigerseed oil alkyds and linsseed oil epoxy ester were, however, chlorinated without catalyst only. The chlorination of BA-MMA copolymer was performed in the presence of UV light.
It was found that the maximum chlorine content of about 50-55 per cent could be achieved in DCO, soybean and nigerseed oil alkyds and linseed oil epoxy ester. Five samples each of chlorinated DCO, soybean and nigerseed oil alkyds and four samples of chlorinated epoxy ester, varying in the chlorine content, were synthesized in order to study the effect of chlorine. In the case of BA-MMA copolymer maximum chlorine content about 26 per cent was obtained. One more sample of chlorinated BA-MMA copolymer, with lesser chlorine content, was synthesized for comparison purposes.
It was confirmed through IR spectroscopy that chlorine enters only into the aliphatic portions of all the three alkyds and epoxy ester molecules by addition and substitution reactions and only into the aliphatic main chain of the BA-MMA copolymer molecule by substitution reaction.
Thermal stability of all the chlorinated products was determinated by the Bloomfield test and by the weight loss procedure and compared with that of the commercial sample of chlorinated rubber. It was found that the termal stability increases with the chlorine content. In the case of chlorinated BA-MMA copolymers, the thermogravimetric analysis (T.G.A) was also carried out which further confirmed that the thermal stability increases with the chlorine content.
All the products were characterized for sulubility, compatibility, colour viscosity, iodine value, epoxide equivalent and molecular weight. The mechanical and chemical film properties were also appraised simultaneously which revealed that, in general, the cholorinated products possessed superior film properties as compared to those of the unchlorinated ones expect in terms of flexibility and adhesion and solvent resistance.
All the chlorinated products also passed the standard tests for protection against corrosion and resistance to salt-spray and fire, justifying their application in high performance coatings.Note de contenu : - Important materials
- Chlorinated DCO alkyds : Preparation of alkyd - Chlorination - Samples prepared
- Chlorinated soybean oil alkyds : Preparation of alkyd - Chlorination - Samples prepared
- Chlorinated nigerseed oil alkyds : Preparation of alkyd - Chlorination - Samples prepared
- Chlorinated epoxy esters : Preparation of epoxy ester - Chlorination - Samples prepared
- Chlorinated acrylics : Preparation of poly (butyl acrylate) - Chlorination - Preparation of chlorinated butyl acrylate-methyl methacrylate (BA-MMA) copolymer - Sample prepared
- Characterization : Solubility and compatibility - Colour - Viscosity - Addition/substitution of chlorine - Thermal stability
- Evaluation : Drying time - Flexibility and adhesion - Impact resistance - Scratch hardness - Water, acid and alkali resistance - Solvent resistance - Protection against corrosion - Resistance to salt-spray - Fire resistancePermalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=13620
in PAINTINDIA > Vol. XLV, N° 7 (07/1995) . - p. 19-35[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 006454 - Périodique Bibliothèque principale Documentaires Disponible