An approach to mimic nature by self-healing - a boon to achieve material durability / Trisha Kaushik in PAINTINDIA, Vol. LXXII, N° 9 (09/2022)  

[article]  inPAINTINDIA > Vol. LXXII, N° 9 (09/2022) . - p. 53-86 Titre : An approach to mimic nature by self-healing - a boon to achieve material durability Type de document : texte imprimé Auteurs : Trisha Kaushik, Auteur ; Shubhajit Paul, Auteur Année de publication : 2022 Article en page(s) : p. 53-86 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Effet mémoire de forme Electrohydrodynamique Encapsulation Enrobage (technologie) Fibres creuses Ionomères Un ionomère est un copolymère thermoplastique « réticulé ioniquement ». La réticulation améliore la cohésion du polymère et la conductivité électrique. Matériaux autoréparants Nanoparticules Particules (matières) -- Migration Polymères supramoléculaires Les polymères supramoléculaires sont des longues chaînes linéaires formées par assemblage réversible de composés de faible masse molaire. La réversibilité de l'association confère à ces matériaux des propriétés proches, mais complémentaires de celles des polymères classiques. En effet, dans les conditions d'utilisation, un polymère supra-moléculaire est en équilibre avec son monomère. Par conséquent, en modifiant légèrement les conditions expérimentales (solvant, concentration, température, cisaillement...), il est possible d'allonger ou de raccourcir les chaînes supramoléculaires et donc de changer les propriétés (rhéologiques, mécaniques...) du système. Cette particularité constitue un avantage pour de nombreuses applications potentielles, ainsi qu'une difficulté de caractérisation. Revêtements organiques Revêtements protecteurs Index. décimale : 667.9 Revêtements et enduits Résumé : We have known that coatings principally are meant to deliver corrosion protection and aesthetics. A few polymeric materials used as coating go through many structural and physical changes, as cracks occur due to physical damage or environmental effect on ageing. These cracks may propagate and can potentially cause over all destruction of the coating as well as the target material itself. This has created a demand for automatic healing as a concept. This concept is mimicking the idea of natural power of self- healing observed in human skins. This process is nothing but incorporating some encapsulated healing materials which will be released in a controlled way to prevent crack propagation when a crack initiates. The encapsulation of active healing agents includes embedment of healing agent containing microcapsules or hollow fibres. There are also some reversible processes like Diels-Alder reaction, ionomers and supramolecular system which provide the self healing mechanism. In this paper, different kinds of self healing mechanism of coating like catalyst free self healing induced by sunlight, shape memory effect, electro-hydrodynamics, nano particle migration, co-deposition etc are also reviewed. Advantages as well as drawbacks have been described for those type of mechanism to achieve self healing property. Characterization and quantification techniques are also described in this review. Application of self healing coating in different sectors has been described and the acceptance of th is new generation coating by global market is also captured in this article. Note de contenu : - SELF-HEALING TECHNIQUES : Classification of self healing material - Methodologies for achieving self-healing functionality - Microcapsule embedment - Hollow fibre embedment - Microvascular system - Reversible cross links - Supramolecular polymers - Ionomers - Miscellaneous techniques - Nanoparticle migration - Co-deposition - Phase separation method - Quantification of healing - Challenges of the self healing coatings - Application of self healing coating - Global market scenario - Prospect evaluation - Table 1 : Different self healing systems via microencapsulation technique - Table 2 : Different works on hollow fibre embedment En ligne : https://drive.google.com/file/d/19nUZQrmPzBy4jgzGARVFfNhDyCSODElp/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=38508 [article]

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Enhanced film performance in water based high PVC paints through strategic surface interactions of inorganic particulates and surfactants / Trisha Kaushik in PAINTINDIA, Vol. LXX, N° 11 (11/2020)  

[article]  inPAINTINDIA > Vol. LXX, N° 11 (11/2020) . - p. 55-66 Titre : Enhanced film performance in water based high PVC paints through strategic surface interactions of inorganic particulates and surfactants Type de document : texte imprimé Auteurs : Trisha Kaushik, Auteur ; Jisha Gangadharan, Auteur ; Ramesh Patil, Auteur ; Pravesh Kumar Gupta, Auteur Année de publication : 2020 Article en page(s) : p. 55-66 Langues : Anglais (eng) Catégories : Agents dispersants (chimie) Charges (matériaux) Composés inorganiques Epaississants Pigments Potentiel zeta Revêtements -- Propriétés mécaniques:Peinture -- Propriétés mécaniques Revêtements en phase aqueuse:Peinture en phase aqueuse Rhéologie Index. décimale : 667.9 Revêtements et enduits Résumé : Globally the trend is towards waterborne paints and paint industry is experiencing strong need of deriving maximum performance benefit through the interactions of the key building blocks of the formulations. The high PVC (pigment volume concentration) waterborne paints are very important in Indian context and thus needs more attention for the researchers and business equally. In typical high PVC waterborne paint the end performances are governed by the surface interactions of inorganic fillers and surfactant molecules causing various morphologies, surface conditioning and particle packing. These parameters in turn have profound effect on the end performances of coatings which include self-stability, rheology, optical properties, flow and levelling and mechanical properties of the dried film. In the present study, surfactants with varied molecular weights, functional groups, molecular arch itect and polarities are employed to understand the interactions with varied inorganic particulates commonly used in paint (carbonates, sulphates, silicates). The performance of the various experimental sets demonstrates the strong co-relation of the surfactant properties on the interactions with the inorganic particulates. Thus the trend analysis is useful tool for the formulator to strategize the composition for gain i ng maximum from the suitable interactions. Note de contenu : - OBJECTIVE - MATERIALS AND METHODS : Materials - Methods - Table 1 : Physico-chemical properties of extender - Table 2 : Physico-chemical properties of surfactant - Table 3 : Emulsion characteristics - Table 4 : Surfactant demand of extender - Table 5 : Surfactant demand for mid PVC system - Table 6 : Surfactant demand for high PVC system - The guideline formulations considered for experimentation are mentioned below - Table 7 : Optical properties of high PVC paints - Table 8 : Optical properties of mid PVC paints - Table 9 : Mechanical properties of high and mid PVC paints - Table 10 : ΔE-Color difference on mixing with hand vs Gyro shaker - Table 11 : Accelerated stability (hot box stability @55°C for 14 days) - Table 12 : Viscosity profile (brookfield/cone-plate/stormer) - Table 13 : Zeta potential of paint sample and extender solution - Table 14 : Shear rate dependent viscosity - Table 15 : 3ITT parameter - Table 16 : Covering capacity En ligne : https://drive.google.com/file/d/1RpKQNIUQYnhO-xyuSBuEB_EH8V5Kex5m/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=35192 [article]

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