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Intermolecular forces in coatings / James Thomas Guthrie in SURFACE COATINGS INTERNATIONAL, Vol. 79, N° 6 (06/1996)
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Titre : Intermolecular forces in coatings Type de document : texte imprimé Auteurs : James Thomas Guthrie, Auteur Année de publication : 1996 Article en page(s) : p. 268-273 Note générale : Bibliogr. Langues : Anglais (eng) Tags : Peinture 'Matériau revêtement' 'Interaction intermoléculaire' Dipôle 'Liaison hydrogène' 'Propriété physique' Fusion 'Température transition vitreuse' 'Masse moléculaire' Plastifiant transition' Index. décimale : 667.9 Revêtements et enduits Résumé : The physical properties of coatings formulations in the liquid state and the solid state directly arise from interactions which exist between the various components of the formulations. In such systems we can envisage, for the liquid state, the solvent, the resin precursor, the film former, the pigment(s), extenders and any/all additives. In the solid state the solvent is removed. The interplay between the remaining species changes. The solvent provides the basis for mobility, opportunities for change and the possibility of closer approaches to homogeneity within the system (or, in certain instances, greater heterogeneity within the system). Note de contenu : - INTRODUCTION : london forces - dipole-dipole forces - interaction forces-polarisability - hydrogen bonding
- INTRAMOLECULAR FORCES AND PHYSICAL PROPERTIES : volatility
- MELTING FEATURES : the glass transition temperature - factors influencing the glass transition temperature - molar mass effects - chain branching effects - chain across linkage - plasticisers - copolymerisation - measurement of transition temperaturesPermalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=17050
in SURFACE COATINGS INTERNATIONAL > Vol. 79, N° 6 (06/1996) . - p. 268-273[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 006572 - Périodique Bibliothèque principale Documentaires Disponible Pigments : myth, shape and structure / J. R. Fryer in SURFACE COATINGS INTERNATIONAL, Vol. 80, N° 9 (09/1997)
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Titre : Pigments : myth, shape and structure Type de document : texte imprimé Auteurs : J. R. Fryer, Auteur Année de publication : 1997 Article en page(s) : P. 421-426 Note générale : Bibliogr. Langues : Anglais (eng) Tags : 'Article synthèse' 'Pigment organique' 'Interaction intermoléculaire' 'Structure cristalline' 'Mode empilement' Morphologie 'Forme 'Composé polaire' 'Relation fabrication structure' non Index. décimale : 667.9 Revêtements et enduits Résumé : The usual textbook describes pigments in terms of the chromophore, and may give a synthetic route by which this compound can be obtained as shown for an azo pigment below.
However, in practice as is well known to those in the industry - the organic synthesis is only part of the process of making a pigment, and indeed may only be a minor part. The handling - eg rheology, the dispersibility, solubility, the colour strength, and even the shade of the pigment are function of the crystal properties.
A molecule has colour by havinf fonctional groups whose electronic transitions absorb energy in the visible spectrum. These transitions can be affected by meighbouring groups within the molecule - particulary in conjugated systems - but also by neighbouring groups in adjacent molecules which are forced into close proximity by the crystal packing. An important aspect of any molecule, which is to be considered as a pigment, is the bonding within the crystal, and how this can affect molecular proximity, and the ultimate shape of the crystal which is formed. It is necessary to consider both molecular shape, and any polar functional groups which may dominate the packing of molecules in the crystal.Note de contenu : - TYPES OF STRUCTURE
- ORGANIC CRYSTALS
- NON-POLAR MOLECULES : Attractive.Dispersion forces - Repulsive forces
- POLAR MOLECULES : Packing of organic molecules in a crystal - Packing coefficient K
- CRYSTAL SHAPE
- CRYSTAL STRUCTUREPermalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=17219
in SURFACE COATINGS INTERNATIONAL > Vol. 80, N° 9 (09/1997) . - P. 421-426[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 006586 - Périodique Bibliothèque principale Documentaires Disponible