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Characterization of fatty acid based self-crosslinking poly(urethane urea) anionomers : morphological perspective / Ashish Patel in PAINTINDIA, Vol. LXII, N° 10 (10/2012)

[article]  inPAINTINDIA > Vol. LXII, N° 10 (10/2012) . - p. 51-62 Titre : Characterization of fatty acid based self-crosslinking poly(urethane urea) anionomers : morphological perspective Type de document : texte imprimé Auteurs : Ashish Patel, Auteur ; Ashok Dighe, Auteur Année de publication : 2012 Article en page(s) : p. 51-62 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Acides gras Caractérisation Copolymère uréthane-urée Couches minces Ionomères Un ionomère est un copolymère thermoplastique « réticulé ioniquement ». La réticulation améliore la cohésion du polymère et la conductivité électrique. Résistance chimique Réticulation (polymérisation) Revêtements Index. décimale : 667.9 Revêtements et enduits Résumé : Fatty acid based self-crosslinking polyurethane urea (PUU) anionomers can find potential applications in coatings field due to enhanced chemical resistance properties. To optimize their performance in coatings, the molecular features that influence the microphase morphology and dynamic mechanical (DM) behavior of polymer films must be understood and exploited. In this work, comprehensive materials characterization of model PUU anionomers films with oxidative-crosslinking microstructure is addressed. For this, linoleic fatty acid based precursor (LPE) was included in polymer backbone which provides reactive sites for autooxidative polymerization. Three series of compositions were prepared with urea content of 8.4 %, 13.2 % and 18.1 % where within each series LPE content has been increasing in same proportion. Different experimental techniques like FTIR, DSC, DMA and mechanical testing were utilized to study the effect of compositional variables on the extent of phase segregation, domain structure and mechanical properties of fully cured polymer samples. The extent soft segment (SS) oxidative crosslinking had market effect on the microphase morphology and DM properties of materials of lowest urea content. Significant phase mixing was observed with evolvement of single heterogenous phase in the sample with highest LPE content. Samples with 13.2 % urea shows less sensitivity towards increased SS crosslinking in their microphase morphology change. Their mechanical and DM properties were observed to be dominated by interlocked hard domains. With higher urea content, such kind of hard segment cohesion results due to greater strength of bidenate H-bonding among urea linkages. While samples with highest % urea, were clearly found to be well microphase separated compared to other two series with highest HS interconnectivity and have marginal effect of extent of SS crosslinking on microphase separation. This study gives an insight about effect of extent of complex oxidative crosslinking on the microphase separation. This study gives an insight about effect of extent of complex oxidative crosslinking on the microphase separation and DM behavior of segmented PUU anionomers based films with different urea content which is useful in designing such materials in coating system with specific surface structure and function. Note de contenu : - MATERIALS - METHODS : Preparation of fatty acid modified PUDs - Preparation of films - Instrumental analysis - FOURIER TRANSFORM INFRARED SPECTROSCOPY - THERMAL ANALYSIS - DYNAMIC MECHANICAL : Effect on the storage modulus - Effect on loss factor (tan delta) - MECHANICAL PROPERTIES Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=16265 [article]

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Phase change material - Efficient way of saving of energy / Aarti Purushottam More in PAINTINDIA, Vol. LXII, N° 10 (10/2012)

[article]  inPAINTINDIA > Vol. LXII, N° 10 (10/2012) . - p. 64-70 Titre : Phase change material - Efficient way of saving of energy Type de document : texte imprimé Auteurs : Aarti Purushottam More, Auteur ; Ravindra V. Gadhave, Auteur Année de publication : 2012 Article en page(s) : p. 64-70 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Chaleur -- Rayonnement et absorption Encapsulation Polymères Revêtements Transition de phase En physique, une transition de phase est une transformation du système étudié provoquée par la variation d'un paramètre extérieur particulier (température, champ magnétique...). Cette transition a lieu lorsque le paramètre atteint une valeur seuil (plancher ou plafond selon le sens de variation). La transformation est un changement des propriétés du système. Index. décimale : 667.9 Revêtements et enduits Résumé : As the demand for the energy increasing day by day but its sources are decreasing there is a need for better utilization of available energy. This can be done by storage of the available energy when it is not required and released of the same in necessary conditions. Thermal energy is one of the important form of energy. And phase change material is worked on the basis of above principles which sotres and released the thermal energy based in the form of latent heat. Inorganic, organic and eutectic type phase change materials are available. Phase change material can be incorporated into matrix by various techniques, like direct addition, microencapsulation, nanoencapsulation etc. They find application in textile, aerospace, refrigerator, building materials, air conditioners etc. The incorporation of phase change material in paint or coating has not yet been explored fully, yet it could one of the best solutions for architectural industry. Note de contenu : - THERMAL ENERGY STORAGE CAN BE POSSIBLE BY THREE WAYS : Sensible heat storage - Latent heat storage - Thermochemical energy storage - Sensible heat storage - Latent heat storage - thermochemical heat storage - Phase change material - Working principle of phase change material - PCM properties - Type of phase change material - Typical properties of available phase change material - Selection criteria for PCM - Technique for immersion of phase change materials - Encapsulation - PCM with supporting material - POLYMERIC PHASE CHANGE MATERIAL - PCM IN POLYMER - PROBLEM WITH PHASE CHANGE MATERIALS AND THEIR SOLUTIONS : Phase separation - Subcooling - APPLICATION OF PHASE CHANGE MATERIALS : Phase change material in paint or coating - PCM for building applications - Phase change material for concrete applications - Solid-solid transition with direct contact heat transfer - Indirect contact latent heat storage of solar energy - PCM in mobile devices - PCM in packaging - PCM in electronic and telecom - PCM in textile - Other applications Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=16266 [article]

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Heat resisting paints / Mukund Hulyalkar in PAINTINDIA, Vol. LXII, N° 10 (10/2012)

[article]  inPAINTINDIA > Vol. LXII, N° 10 (10/2012) . - p. 84-85 Titre : Heat resisting paints Type de document : texte imprimé Auteurs : Mukund Hulyalkar, Auteur Année de publication : 2012 Article en page(s) : p. 84-85 Langues : Anglais (eng) Catégories : Formulation (Génie chimique) Résistance thermique Revêtements Index. décimale : 667.9 Revêtements et enduits Résumé : These paints are usually used for no of end uses like chimney/furnaces/biogas plate ovens/exhausts etc., for applications with temperatures ranging from 100°C, 200°C, 250°C-300°C, 400°C, 600°C, 800°C, 1000°C etc. Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=16267 [article]

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