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Modeling of molecular weight of acrylic resins using full factorial techniques / Nishant N. Prabhu in PAINTINDIA, Vol. LIX, N° 4 (04/2009)

[article]  inPAINTINDIA > Vol. LIX, N° 4 (04/2009) . - p. 53-64 Titre : Modeling of molecular weight of acrylic resins using full factorial techniques Type de document : texte imprimé Auteurs : Nishant N. Prabhu, Auteur ; Deepak Shanbhag, Auteur Année de publication : 2009 Article en page(s) : p. 53-64 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 667.9 Revêtements et enduits Résumé : Initiator half life at the processing temperature, initiator concentration and monomer feed rate are the factors governing the molecular weight and the viscosity properties of an acrylic resin in "drip-feed" process. Contribution of each of these factors on the molecular weight of the polymer was determined using full factorial analysis. Twelve resin batches were processed as per the statistical design of experiments. The molecular weight distribution of these acrylic resins were recorded by GPC. The data was analysed by full factorial analysis. A mathematical equation was obtained correlating the molecular weight of the polymer with the levels which these three parameters are set during the processing. Using this mathematical equation, the molecular wight was predicted for a batch where these parameters were set at particular values. The batch was processed and its molecular weight was determined by GPC. The observed value was found to be in good agreement with the value predicted by the equation. Thus, this statistical tool can be used for predicting the molecular weight of the polymer from the set parameters. The parameters can now be set based on other consideration such as energy consumption, cost of formulation and cycle time and molecular weight can be predicted using the equation. The parameters can be further finetuned using the equation to get desired molecular weight thus eliminating the requirement of processing of large number of batches. Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=6788 [article]

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Advances in UV curable coatings using photolatent additives / Anju T. Gidwani in PAINTINDIA, Vol. LIX, N° 4 (04/2009)

[article]  inPAINTINDIA > Vol. LIX, N° 4 (04/2009) . - p. 87-100 Titre : Advances in UV curable coatings using photolatent additives Type de document : texte imprimé Auteurs : Anju T. Gidwani, Auteur Année de publication : 2009 Article en page(s) : p. 87-100 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Revêtements -- Additifs Revêtements -- Séchage sous rayonnement ultraviolet Index. décimale : 667.9 Revêtements et enduits Résumé : Recent advances in photolatent additives for UV curing helps in doing away with the shortcomings of conventional UV curable systems. There are intrinsic limitations associated with radical photo polymerization such as oxygen inhibition, insufficient curing of shadow areas, poor coating of thick and highly pigmented coating, lack of adhesion on certain substrate. All these limitations can be overcome by recent development using photolatent additives and thus support the expansion of the scope of UV curing technology in industrial and automotive application. Photolatent bases are stable and inactive in the dark when incorporated in coating systems, but efficiently releases tertiary amines or amidines on irradiation with uv or daylight. Variety of formulation can be crosslinked by photolatent base catalyst. The new technology allows adjustable speed UV and daylight curing, as well as post cure of poorly exposed and shadow areas on three dimensional objects. It also extends the pot life of 2K systems, which have to be mixed prior to the application. Another exciting application of photolatent effect is the addition of pleasant smell in paint using photolatent fragrance additives. Also photo induced effect can be obtained by using photolatent colorants. Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=6826 [article]

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Studies on the blends of epoxy and different liquid rubber / Ranjana Yadav in PAINTINDIA, Vol. LIX, N° 4 (04/2009)

[article]  inPAINTINDIA > Vol. LIX, N° 4 (04/2009) . - p. 65-86 Titre : Studies on the blends of epoxy and different liquid rubber Type de document : texte imprimé Auteurs : Ranjana Yadav, Auteur ; Deepak Srivastava, Auteur Année de publication : 2009 Article en page(s) : p. 65-86 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Alliages polymères Caoutchouc Epoxydes Index. décimale : 667.9 Revêtements et enduits Résumé : Epoxy resins, either glycidyl epoxy or non-glydidyl epoxy resins, reacted with a large number of chemical species called curatives or hardeners. Optimum performance properties can be obtained by cross-linking the epoxy resins into a three dimensional and infusible network. The choice of curing agent depends on processing method, curing conditions, i.e., curing temperature and time,physical and chemical properties desired, toxicological and environmental limitations and cost. But, like other thermosetting resins, the brittleness of epoxy resin is a major deficiency in many applications. To overcome this deficiency of epoxy resins, many attempts have been made to blend them with reactive liquid rubbers such as carboxyl and amine terminated butadiene acrylonitrile rubber (CTBN and ATBN). The properties of epoxy/CTBN or epoxy/ATBN systems, especially their mechanical properties, have been intensively studied, and results have proved that. With an appropriate weight of rubber, the rubber modified resins have strongly improved toughness. In this way, carboxyl-terminated copolymer of butadiene and acrylonitrile (CTBN) has been used by various workers with diglycidyl ether bidphenol A (DGEBA) epoxy resins. Blend samples containing 0-25 wt% CTBN were prepared according to the procedure simular to that adopted by ting. The calculated quantity of epoxy resin wss, firstly, stirred at 120°C for 1 h to entrap all air bubbles from the resin, the calculated quantity of polyamine was added and stirred to get a clear homogeneous mixture. Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=6827 [article]

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Nanotechnology & coatings Q & A / Vinayak M. Natu in PAINTINDIA, Vol. LIX, N° 4 (04/2009)

[article]  inPAINTINDIA > Vol. LIX, N° 4 (04/2009) . - p. 109-112 Titre : Nanotechnology & coatings Q & A Type de document : texte imprimé Auteurs : Vinayak M. Natu, Auteur Année de publication : 2009 Article en page(s) : p. 109-112 Langues : Anglais (eng) Catégories : Matériaux hybrides Nanotechnologie Revêtements:Peinture Index. décimale : 667.9 Revêtements et enduits Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=6828 [article]

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