Aziridine cure of acrylic colloidal unimolecular polymers (CUPs) / Jigar K. Mistry in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 10, N° 4 (07/2013)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 10, N° 4 (07/2013) . - p. 453-463 Titre : Aziridine cure of acrylic colloidal unimolecular polymers (CUPs) Type de document : texte imprimé Auteurs : Jigar K. Mistry, Auteur ; Michael R. Van De Mark, Auteur Année de publication : 2013 Article en page(s) : p. 453-463 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Adhésion Aziridine L'aziridine (n.f.) ou azacyclopropane est le composé organique cyclique de formule brute C2H5N. Elle est aussi le composé parent des aziridines et du groupe fonctionnel qui correspond à un hétérocycle à trois côtés composé d'une amine et de deux groupes méthylène. Brillance (optique) Colloides Dureté (matériaux) Polyacryliques Polymères -- Synthèse Polymères unimoléculaires colloïdaux Résistance à l'abrasion Résistance au chocs Résistance chimique Réticulation (polymérisation) Revêtements:Peinture solvants Souplesse (mécanique) Tests d'efficacité Vernis Index. décimale : 667.9 Revêtements et enduits Résumé : Polymers were synthesized with a 1:7 or 1:8 ratio of acrylic acid to acrylate monomers to produce an acid-rich resin. The polymers were water-reduced and solvent-stripped to produce colloidal unimolecular polymers (CUPs). These particles are typically 3–9 nm in diameter, depending upon the molecular weight, and have different rheological behavior from micelles, polyelectrolytes, fullerenes, and latex particles, due to their charged surface and large surface areas. They were then formulated into ambient cure clearcoatings with aziridine crosslinking. These aziridine-cured acrylic CUPs were either solvent-free or very low VOC. The coatings were evaluated for their MEK resistance, adhesion, hardness, gloss, flexibility, wet adhesion, and abrasion and impact resistance properties. Note de contenu : - EXPERIMENTAL : Materials - Polymer syntheses - Characterization of polymers synthesized - Water reduction of polymers to form CUPs - Characterization of CUPs - CUP coatings - Testing of the CUP clearcoats - RESULTS AND DISCUSSION : Polymer synthesis and characterization - Aziridine-cured CUP coatings DOI : 10.1007/s11998-013-9489-z En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-013-9489-z.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=19095 [article]

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DSC and TGA characterization of free and surface water of colloidal unimolecular polymer (CUP) particles for coatings applications / Peng Geng in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 18, N° 1 (01/2021)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 18, N° 1 (01/2021) . - p. 143-154 Titre : DSC and TGA characterization of free and surface water of colloidal unimolecular polymer (CUP) particles for coatings applications Type de document : texte imprimé Auteurs : Peng Geng, Auteur ; Sagar Vijay Gade, Auteur ; Michael Roy Van de Mark, Auteur Année de publication : 2021 Article en page(s) : p. 143-154 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Analyse thermique Caractérisation Densité Eaux de surface Formulation (Génie chimique) Granulométrie Poids moléculaires Polymères -- Synthèse Polymères unimoléculaires colloïdaux Revêtements en phase aqueuse Revêtements organiques Rhéologie Stabilité gel-dégel Taille des particules Thermogravimétrie Index. décimale : 667.9 Revêtements et enduits Résumé : Colloidal unimolecular polymer (CUP) particles are spheroidal nano-scale and 3–9 nm that can be easily designed and controlled. The formation of CUP involves simple synthesis and water reduction. These nanoparticles have charged hydrophilic groups on the surface and are surrounded by a layer of surface water that does not freeze until very low temperature. CUPs have very high surface area per gram, which gives them a high nonfreezing water content. The CUP system is free of surfactant and has zero VOC, exhibiting great potential for coatings applications. The amount and thickness of the surface water were determined by differential scanning calorimetry (DSC) using the heat of fusion. The solution density and knowledge of the resin density and the composition of the CUP solution were used to determine the density of surface water. The evaporation rate of free water and surface water in CUP solutions were investigated by thermogravimetric analysis (TGA) and showed the effect of CUP on the evaporation rate. CUP as an additive to give freeze thaw stability, wet edge retention and open time improvements were explored. Excellent performance in freeze thaw, wet edge time improvement and more open time was found. The CUP system offers an excellent alternative to form zero VOC waterborne coatings. Note de contenu : - EXPERIMENTAL : Polymer synthesis - Absolute molecular weight of copolymers - Density of dry CUPs - Density of CUP solutions - Acid number (AN) - Viscosity of CUP solutions - Particle size of CUP - Differential scanning calorimetry - Paint formulation - Freeze thaw stability - Wet edge retention - Paint viscosity - Thermogravimetric analyzer - RESULTS AND DISCUSSION : Heat of fusion - Freeze-thaw stability - Evaporation rate - Table 1: Polymer synthesis, the amount of materials used - Table 2 : Molecular wieght, particle size, acid number and density of the polymers - Table 3 : Weight fraction of free water and CUP polymers - Table 4 : Paint formulation of the master batch - Table 5 : Weight per gallon, % solids by weight, % solids by volume and PVC of the paint - Table 6 : Freeze thaw stability (KU viscosity) - Table 7 : Wet edge retention and open time DOI : https://doi.org/10.1007/s11998-020-00388-3 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-020-00388-3.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=35358 [article]

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Plugs for forming cups / Edmund Haberstroh in KUNSTSTOFFE PLAST EUROPE, Vol. 93, N° 12/2003 (12/2003)

[article]  inKUNSTSTOFFE PLAST EUROPE > Vol. 93, N° 12/2003 (12/2003) . - p. 24-26 Titre : Plugs for forming cups Type de document : texte imprimé Auteurs : Edmund Haberstroh, Auteur ; Jürgen Wirtz, Auteur Année de publication : 2004 Article en page(s) : p. 24-26 Langues : Anglais (eng) Catégories : Polymères unimoléculaires colloïdaux Index. décimale : 668.4 Plastiques, vinyles Résumé : Choosing plugs - Thermoforming is a long-established method for mass producing cups. However, its enormous potential is frequently not used to the full. The usual cause of problems is pre-stretching with plugs. Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=6998 [article]

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Producing PP cups faster / Mike Fokken in KUNSTSTOFFE INTERNATIONAL, Vol. 97, N° 9/2007 (09/2007)

[article]  inKUNSTSTOFFE INTERNATIONAL > Vol. 97, N° 9/2007 (09/2007) . - p. 139-141 Titre : Producing PP cups faster Type de document : texte imprimé Auteurs : Mike Fokken, Auteur Année de publication : 2007 Article en page(s) : p. 139-141 Langues : Anglais (eng) Catégories : Polymères unimoléculaires colloïdaux Index. décimale : 668.4 Plastiques, vinyles Résumé : Packaging - In the food industry, polypropylene (PP) cups are enjoying increasing popularity, even though this material is considerably more difficult to process than polystyrene (PS). To serve the growing demand, new machine concepts and functional automation are necessary. Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=6730 [article]

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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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Viscosity comparision with different cups in seconds (Unit) / Mukund Hulyalkar in PAINTINDIA, Vol. LXIX, N° 9 (09/2019)  

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