Design of pigment dispersants : methodology for selection of anchoring groups / Henk J. W. Van Den Haak in JOURNAL OF COATINGS TECHNOLOGY (JCT), Vol. 69, N° 873 (10/1997)

[article]  inJOURNAL OF COATINGS TECHNOLOGY (JCT) > Vol. 69, N° 873 (10/1997) . - p. 137-142 Titre : Design of pigment dispersants : methodology for selection of anchoring groups Type de document : texte imprimé Auteurs : Henk J. W. Van Den Haak, Auteur Année de publication : 1997 Article en page(s) : p. 137-142 Note générale : Bibliogr. Langues : Américain (ame) Tags : Peinture  Adjuvant  Dispersant  'Groupe  fonctionnel'  Adsorption Index. décimale : 667.9 Revêtements et enduits Résumé : The development of pigment dispersants for waterborne or solvent-borne paint systems requires knowledge about anchoring groups, soluble tails, and about an effective and practically feasible architecture to build them together into one molecule.In this paper a method is described for the comparison of the anchoring properties of functional groups. The adsorption of model compounds to pigments from an aqueous solution is measured. From the adsorption isotherms thus obtained, the free energy of adsorption can be calculated, as well as the number of anchoring groups that can adhere to a given weight or surface area of pigment. Note de contenu : - ANCHORING : Theory of adsorption - Real vs. apparent adsorption - INFORMATION FROM THE ADSORPTION MEASUREMENTS : The adsorption capacity A - The strenght of adsorption - Co(adsorption of solvent Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=18299 [article]

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Monte Carlo simulation of polymer syntheses: a useful tool to judge the REACH and OECD polymer status / Henk J. W. Van Den Haak in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 15, N° 4 (07/2018)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 15, N° 4 (07/2018) . - p. 671-678 Titre : Monte Carlo simulation of polymer syntheses: a useful tool to judge the REACH and OECD polymer status Type de document : texte imprimé Auteurs : Henk J. W. Van Den Haak, Auteur Année de publication : 2018 Article en page(s) : p. 671-678 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Chimie industrielle -- Législation Chromatographie sur gel Monte-Carlo, Méthode de Polymères -- Synthèse Simulation par ordinateur Index. décimale : 667.9 Revêtements et enduits Résumé : The REACH or OECD polymer definition requires a certain chain length, rather than a molecular weight. This makes it very difficult to decide from gel permeation chromatography (GPC) alone whether a substance complies with the REACH polymer definition. Therefore, in parallel to the real in vitro syntheses, we simulated the preparation of polycondensation and polyaddition resins by means of well-known Monte Carlo methods. The output of these simulations (basically a list of all the molecules formed, their molecular weights, and their relative quantities) was used to simulate a GPC. The simulation parameters (reaction types and relative reaction rates) were adapted until a good match between the measured and the simulated GPC was obtained. The simulation was then considered trustworthy. This appeared to be a strong tool to judge if a product is a polymer according to REACH, EPA, or emerging worldwide legislation. Note de contenu : - Simulation of polymerizations - Simulation of the GPC - REACH - EPA DOI : 10.1007/s11998-018-0043-2 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-017-0043-2.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=30845 [article]

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