Surface tension studies in colloidal unimolecular polymers / Ashish Zore in COATINGS TECH, Vol. 18, N° 2 (02/2021)  

[article]  inCOATINGS TECH > Vol. 18, N° 2 (02/2021) . - p. 24-31 Titre : Surface tension studies in colloidal unimolecular polymers Type de document : texte imprimé Auteurs : Ashish Zore, Auteur ; Michael van de Mark, Auteur Année de publication : 2021 Article en page(s) : p. 24-31 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Alliages polymères -- propriétés mécaniques Caractérisation Granulométrie Latex Poids moléculaires Polycarboxylates Polymères -- Synthèse Polymères unimoléculaires colloïdaux Polysulfones Polyuréthanes Tension superficielle Index. décimale : 668.9 Polymères Résumé : Colloidal unimolecular polymer particles, or CUPs, are true nanoscale charged particles of size less than 10 nm that are made by a simple method that allows for preparation of additive-free, zero-volatile organic content (VOC) and stable dispersions. These CUP particles are made from a single polymer chain containing a well-balanced number of hydrophobic and hydrophilic units (Figure 1). The polymer chain is transformed into a CUP particle because the polymer-polymer interaction exceeds polymer-solvent interaction during the addition of water to the polymer in dilute solution in a low-boiling, water-loving solvent, resulting in collapse of the chain to form a particle. This process is like formation of micelles, or the water reduction process in water-reducible coatings.1 The charged groups on the surface of the particles provide stability and prevent aggregation due to ionic repulsion. The CUP suspension is free of any additives or surfactants as it contains only charged particles, water, and counterions. Due to the process simplicity, it is easy to control the particle size, charge density on the surface, and composition of these particles.2 CUP particles can also be a good model material for study of protein due to similarities in their size. They can also have potential applications in the field of coatings, drug delivery, catalyst matrix, etc. CUPs have a great potential in the field of coatings as demonstrated in several publications by Van De Mark et.al. They can be used as coating resin in conjunction with latex and polyurethane dispersions (PUDs) and can be cured with an aziridine3 or a melamine crosslinker4. CUPs with sulfonic acids as the charged stabilizing group can be used as a catalyst for waterborne curing such as acrylic-melamine systems.5 CUPs with amine functional groups CUPs with amine functional groups have been synthesized and used as a crosslinker for waterborne epoxy coatings.6 The CUP particles are hydrated with a layer of water around them, often referred to as surface or bound water, which is non-freezable. Note de contenu : - EXPERIMENTAL : Synthesis of polymer and water reduction - Characterization - RESULTS AND DISCUSSION : Characterization of polymers - Particle size analysis - Equilibrium surface tension behavior - Fig. 1 : Formation of CUPs - Fig. 2 : Surface tension vs concentration behavior for PUD1, PUD2 (solid triangles) and PUD2 diluted to different concentration using 12.9% NMP-water mixture instead of water - Dynamic surface tension behavior - Fig. 3 : Surface tension vs concentration behavior for polymer 2 (CUPs), PUD1 and latex - Fig. 4 : Equilibrium surface tension of the carboxylate CUPs (polymers 1 and 2), sulfonate CUPs (polymer), and QUAT-CUPs (polymer 4) - Fig. 5 : Dynamic surface tension behavior of the latex, PUD1, and CUPs at different surface ages at 3% solids - Fig. 6 : Dynamic surface tension behavior of the carboxylate (polymer 2), sulfonate (polymer3), and QUAT (polymer 4) CUPs at different surface ages - Table 1 : Acid number, densities, and molecular weights of the copolymers - Table 2 : Molecular weights and particle size of the CUPs - Table 3 : Fitting parameters for dynamic surface tension vs surface age at 0.5 mol/m3 and diffusion coefficient (Dc) at 25°C En ligne : https://drive.google.com/file/d/1Z_Mny6LNFkOkYOVQS4cTyTGyEAqVV8xm/view?usp=share [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=35256 [article]

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