Interpenetrating polymer networks for coatings : properties, characterization, applications and current status / T. Amandaraj in PAINTINDIA, Vol. LI, N° 4 (04/2001)

[article]  inPAINTINDIA > Vol. LI, N° 4 (04/2001) . - p. 43-54 Titre : Interpenetrating polymer networks for coatings : properties, characterization, applications and current status Type de document : texte imprimé Auteurs : T. Amandaraj, Auteur ; P. S. Mohan, Auteur ; Smt. Krishnan, Auteur ; M. Raghavan, Auteur Année de publication : 2001 Article en page(s) : p. 43-54 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Caractérisation Formulation (Génie chimique) Liants Réseaux polymères Revêtements:Peinture Index. décimale : 667.9 Revêtements et enduits Résumé : As the protective mechanism of an organic coating is largely dependent on its polymer used as binder, blending of polymers has long been practised to improve end use properties. Polymer alloys, in particular interpenetrating polymer networks [IPNs], offer a variety of improved coating properties. IPNs represent a mode of blending of two or more polymers to produce a mixture in which the phase separation is not as extensive as in polymer blends. The combination of varied chemical types of polymeric networks in different proportions, often resulting in different controlled morphologies, has produced IPNs with synergistic behavior. The physical properties of the IPNs fall into two classes : the first class contains those properties, which vary monotonously as the composition is varied from one pure network to the other. The second class of properties includes those which at least in certain IPNs can exhibit maxima or minima at an intermediate composition between the two networks. IPNs offer a broad range of applications including protective coatings. IPN technology has surprisingly covered almost all sorts of applications and, in the coatings areas also, quite a good number of commercial products based on full, semi- and pseudo-IPNs are already available in the market, although they are rarely identified as such. In this paper, the noteworthy IPNs so far published have been cited. Note de contenu : - Polymer blends and alloys - Interpenetrating polymer networks : - Formation of IPNs – Topological isomerism of IPNs – Synergic behavior of IPNs - Morphology of IPNs - Glass transition behavior of IPNs - Physical properties of IPNs - Characterization of IPNs : - Morphology by electron microscopy – Thermal measurements – Mechanical properties – Kinetic measurements of IPN formation – Barrier properties of IPNs – Chemical and corrosion resistance properties of IPNs – Solvent resistance properties of IPNs – Visco-elastic measurements of IPNs – Electrical properties of IPNs – Infra-red [IR] and Fourier Transform Infra-red [FT-IR] spectroscopy – Gel permeation chromatography – Density and wettability - Application of IPNs : - IPNs as leather coatings – IPNs as dental fillings – IPNs as sheet-moulding compounds [SMCs] – IPNs as noise and vibration damping materials – IPNs as rimplast thermoplastic resins – IPNs as automobile parts - Current status Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=12577 [article]

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Studies on characterization of high performance coatings based on polymer alloys of interpenetrating polymer networks / T. Anandaraj in PAINTINDIA, Vol. LI, N° 6 (06/2001)

[article]  inPAINTINDIA > Vol. LI, N° 6 (06/2001) . - p. 35-52 Titre : Studies on characterization of high performance coatings based on polymer alloys of interpenetrating polymer networks Type de document : texte imprimé Auteurs : T. Anandaraj, Auteur ; P. S. Mohan, Auteur ; Sm Krishnan, Auteur ; Kalpana Balakrishnan, Auteur ; M. Raghavan, Auteur Année de publication : 2001 Article en page(s) : p. 35-52 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Analyse thermique Anticorrosion Caractérisation Chromatographie sur gel Epoxydes Fourier, Spectroscopie infrarouge à transformée de Liants Microscopie électronique à balayage Polyacrylates Polyuréthanes Réseaux polymères Revêtements protecteurs Revêtements:Peinture Spectrométrie infrarouge Spectroscopie d'impédance électrochimique Index. décimale : 667.9 Revêtements et enduits Résumé : Organic coatings are valued after the polymeric binder material out of which it is made for the reason that it only decides the extent of protection and the life of a coating. Of a few ways to obtain better performing polymeric binders, alloying the incompatible polymers through compatibilization is fast-emerging with a number of promises. Interpenetrating polymer networks are one of its kinds. In this study, two polymer alloys of Interpenetrating Polymer Network (IPN) based on epoxy-acrylic-polyurethane polymers have been developed in the laboratory and subjected to different laboratory accelerated tests as pigmented coatings. They have been found to possess far superior physical and chemical and corrosion resistance properties compared to crosslinked acrylates, polyamide cured epoxies and polyurethanes. The IPNs as clear coatings were also characterized by various physico-chemical and surface analytical techniques. The thermo-analytical techniques, FTIR and SEM confirmed the formation of IPN. The improved corrosion resistance properties were established by water permeation tests and electrochemical impedance spectroscopy. Note de contenu : - Synthesis of epoxy-acrylate precursors - Synthesis of IPNs - Neat systems - Crosslinked acrylic copolymer system - Polyamide catalyzed epoxy system - Acrylic polyol based aromatic polyurethane system - Nomenclature of coatings - Specimen preparation - Free-filming of IPNs - Characterization methods : FT-IR spectroscopy – Gel permeation chromatography – Scanning electron microscopy – Thermal measurements – Gel-time measurements – Moisture vapor transmission rate measurements – Electrochemical AC Impedance spectroscopy (EIS) - FT-IR spectra - Gel permeation chromatograms - Thermal measurements - Morphology of IPNs by SEM - Get-time measurements - Moisture-vapor transmission rates - Electrochemical AC impedance spectroscopy Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=12590 [article]

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