Accueil
Catégories
> Polymères ramifiés
Polymères ramifiésVoir aussi
|
Ajouter le résultat dans votre panier Affiner la recherche
Etendre la recherche sur niveau(x) vers le bas
Role of hyper branched polymers in coatings / Machindra Shinde in PAINTINDIA, Vol. LXIX, N° 12 (12/2019)
[article]
Titre : Role of hyper branched polymers in coatings Type de document : texte imprimé Auteurs : Machindra Shinde, Auteur Année de publication : 2019 Article en page(s) : p. 61-70 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Polymères -- Propriétés chimiques
Polymères dendritiques
Polymères ramifiésIndex. décimale : 667.9 Revêtements et enduits Résumé : The hyperbranched polymers are more attractive because of their polydispersity and have less perfect globular shape. Unlike conventional polymers, the high number of end groups and their nature participate actively in the physical properties (solubility, glass transition temperature and viscosity) in combination with the backbone structure. This characteristic is exceptional since it leads to the possibility of dseigning the macromolecule with the combination of many different end groups, thus defining the type of reactive chemistry, properties and applications.
Hyperbranched polymers also have received much attention due to their unique chemical properties as well as their potential applications in coatings, additives, drug and gene delivery, macromolecular building blocks, nanotechnology, and supramolecular science. Hyperbranched polymers can be prepared by means of single monomer methodology (SMM) and double-monomer methodology (DMM). Too many factors have to be considered such as nature of end groups, branching density, flexibility of the repeating units, and in addition, the broad molar mass distribution can obscure specific effects.
Hyperbranched and dendritic polymers show low viscosities at high molecular weights. For coating applications, this should be highly interesting in terms of the environmental issues, where legislation plays an important role in the future trend towards coatings with lower VOCs than presently applicable. However, favourable viscosity is not the only property to which hyper branched polymers can contribute.Note de contenu : - HISTORY OF HYPERBRANCHED POLYMERS
- synthesis and properties of hyperbranched polymer : Structure - Dendritic growth - Divergent approach - Mixed reactivity approach - Convergent approach - Perstorp technology - Polymer composition
- STRUCTURE/PROPERTY RELATIONS : Physical properties - Reactivities - Chemical resistance - Thermal properties - mechanical properties - Molecular design
- APPLICATIONS : High-solid alkyds - Hyperbranched epoxies - Polyurethane dispersions - Hyperbranched acrylates
- FUTURE OF HYPERBRANCHED POLYMERS
- Fig. 1 : A schematic descriptionof dendritic polymer
- Fig. 2 : Dendritic molecule
- Fig. 3 : Dendritic growth according to the divergent approach
- Fig. 4 : Dendritic growth through mixed reactivity
- Fig. 5 : Dendritic growth through the convergent approach
- Fig. 6 : Perstorp technology
- Fig. 7 : Schematic illustration of hyperbranched growth
- Fig. 8 : Molecular design of a hyperbranched polymer
- Fig. 9 : Schematic illustration of hyperbranched PUR dispersion
- Graph 1 : Viscosity vs. molecular weight of hyperbranched polyester
- Graph 2 : TGA measurement of a hyperbranched polyester based on a 3-functional core and Bis-MPA
- Graph 3 : Air drying of high-solid alkyds
- Graph 4 : Toughening of epoxies by hyperbranched epoxies
- Graph 5 : Curing behavious of hyperbranched PUR-HMMM clear coat @ 160°C
- Graph 6 : UV curing of neat hyperbranched acrylates
- Table 1 : Properties of cured PUR dispersion at different cross-linking densities
- Table 2 : Properties of UV-cured hyperbranched acrylatesEn ligne : https://drive.google.com/file/d/1S34dhZ9slxryYLsTJRPChSSVn8QH8Imu/view?usp=share [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=33642
in PAINTINDIA > Vol. LXIX, N° 12 (12/2019) . - p. 61-70[article]Réservation
Réserver ce document
Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité 21461 - Périodique Bibliothèque principale Documentaires Disponible Scratch- and mar-resistant refinish two-pack clear coats - linear versus branched acrylics / J. Huybrechts in SURFACE COATINGS INTERNATIONAL. PART B : COATINGS TRANSACTIONS, Vol. 89, B4 (12/2006)
[article]
Titre : Scratch- and mar-resistant refinish two-pack clear coats - linear versus branched acrylics Type de document : texte imprimé Auteurs : J. Huybrechts, Auteur ; A. Vaes, Auteur ; K. Dusek, Auteur ; M. Duskova-Smrckova, Auteur ; R. Barsotti, Auteur Année de publication : 2006 Article en page(s) : p. 275-283 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Automobiles -- Vernis
Copolymères
Copolymères greffés
Polyacryliques
Polymères ramifiés
Polyols
Résistance à l'abrasion
Résistance à l'usure
Vernis bi-composantIndex. décimale : 667.9 Revêtements et enduits Résumé : The new generation clear coats introduced in the automotive industry have improved scratch and mar resistance. It is believed that those properties are related to the introduction of new binder technologies leading to higher film cross-link densities. This was relatively easy to accomplish in the automotive industry because baking temperatures are well above the glass-transition temperature (Tg) of the final clear coat film. In car repair coatings, the cross-linking takes place under conditions where the intermediate and/or final film Tg values are above the curing temperature. Such formulations result in vitrification during the drying process, a transition during which chemical cure and solvent release are slowed down substantially. The chemical cure can be improved through more reactive and/or higher functional binders, but this shifts the gel point to shorter times in the drying cycle which may lead to more solvent entrapment, resulting in low film hardnesses and paint defects. This paper describes the overall properties of 2K-refinish clear coats based on linear versus branched, random and graft acrylic polyols. The authors will try to correlate overall properties with theoretical predictions and practical results. Note de contenu : - EXPERIMENTAL : Binders, cross-linkers and clear coat formulations - Physical measurements on clear coats
- THEORETICAL BACKGROUND
- Table 1 : Physical properties of linear and branched graft acrylics
- Table 2 : Film Tg values, swell ratios and gel fractions at different catalyst levels and baking cycles, measurement after 30 days of ageing at room temperature
- Table 3 : Gel time for a 55% solution of different acrylics activated with HDI trimer at 500 ppm DBTDL
- Table 4 : Theoretical calculations of ve, WSov Wge~ and NCO conversion at the gel point for reaction of the BACR H and LACR H at different OH/NCO ratios and practical
measurements Tg, Mn and Mw for film cross-linked at 140~ (I = insoluble)
- Table 5 : Property balance of different clear coats based on structured acrylics versus a commercial standard applied over a dark blue metallic basecoat at specified
baking conditionsDOI : 10.1007/BF02765579 En ligne : https://link.springer.com/content/pdf/10.1007/BF02765579.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=5268
in SURFACE COATINGS INTERNATIONAL. PART B : COATINGS TRANSACTIONS > Vol. 89, B4 (12/2006) . - p. 275-283[article]Réservation
Réserver ce document
Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité 006010 - Périodique Bibliothèque principale Documentaires Disponible Silane modified hyperbranched alkyd for high performance polyurethane coating on multi-substrate / Tirthankar Jana in PAINTINDIA, Vol. LXX, N° 1 (01/2020)
[article]
Titre : Silane modified hyperbranched alkyd for high performance polyurethane coating on multi-substrate Type de document : texte imprimé Auteurs : Tirthankar Jana, Auteur ; Debabrata Pal, Auteur ; Rantu Bhunia, Auteur Année de publication : 2020 Article en page(s) : p. 55-66 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Adhésion
Anticorrosifs
Anticorrosion
Application directe sur le métal
Polymères ramifiés
Polyuréthanes
Réaction de couplage
SilanesIndex. décimale : 667.9 Revêtements et enduits Résumé : The coating on metal substrate enhances protection against corrosion and aesthetic value. Generally multi coat system is followed to perform these requirements. To reduce the painting cost, painting cycle as well as volatile organic compound emission, high solid coating in single coat is most promising. Use of hyperbranched alkyd is a suitable approach for this purpose as it form high solid, high build up in a single coat, better levelling and adhesion on any substrates. In the present study, to achieve adhesion on multi substrate, different silane coupled hyperbranched alkyd polyurethane have been synthesised and characterised through different analytical techniques. The coating based on silane modified hyperbranched polymer exhibited excellent anti corrosive performance, adhesion on multi substrate and initial gloss and gloss retention under accelerated weathering. Such silane modified hyperbranched polyurethane coating has potential for application in direct to metal (DTM) coating. Note de contenu : - EXPERIMENTAL : Materials - Synthesis of hyperbranched alkyd - Formulation of coatings and film preparation
- CHARACTERIZATION : Characterization of resins
- ACCELERATED WEATHERING TEST
- CORROSION RESISTANCE TEST
- RESULTS AND DISCUSSION : FTIR spectroscopy - DSC analysis - Physical properties of resin - Scratch resistance, flexibility, abrasion resistance, pendulum hardness & impact resistance - Adhesion strength
- ACCELERATED WEATHERING TEST : Corrosion resistance i.e. salt spray and humidity resistance performance
- Fig. 1 : Scheme of the synthesis of hyperbranched core
- Fig. 2 : Scheme of the synthesis of silan modified hyperbranched alkyd
- Fig. 3 : FTIR Spectrum of different silane modified hyperbranched alkyd. (A) unmodified hyperbranched alkyd, (B) amino silane, (C) thio silane and (D) epoxy silane modified hyperbranched alkyd
- Fig. 4 : DSC Thermogram of different alkyd polyurethane coatings using alkyd A, B, C and D respectively
- Fig. 5 : Pull of adhesion strength of different alkyd polyurethane (PU) coating system
- Fig. 6 : Adhesion test results on different test panels
- Fig. 7 : QUV gloss retention of different alkyd polyurethand system at different intervals
- Fig. 8 : ΔE value of different alkyd polyurethane coating after 500 hrs of QUV exposure
- Fig. 9 : Images of test panels after salt spray exposure of 500 hrs
- Fig. 10 : Images of test panels after humidity test of 500 hrs
- Table 1 : Physical characteristics of four different alkyds
- Table 2 : Physical and mechanical properties of alkyd polyurethane coatingsEn ligne : https://drive.google.com/file/d/1kF7R7QvsT07K6t9anJ4rwtetmtIE6gzp/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=34679
in PAINTINDIA > Vol. LXX, N° 1 (01/2020) . - p. 55-66[article]Réservation
Réserver ce document
Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité 22389 - Périodique Bibliothèque principale Documentaires Disponible Simulation des écoulements de polymères branchés avec le modèle pom-pom / Amine Ammar in RHEOLOGIE, Vol. 1 (08/2002)
[article]
Titre : Simulation des écoulements de polymères branchés avec le modèle pom-pom Type de document : texte imprimé Auteurs : Amine Ammar, Auteur ; Arnaud Poitou, Auteur Année de publication : 2002 Article en page(s) : p. 1-10 Note générale : Bibliogr. Langues : Français (fre) Catégories : Ecoulement visqueux
Matières plastiques -- Extrusion:Polymères -- Extrusion
Polymères ramifiés
Simulation par ordinateur
ViscoélasticitéIndex. décimale : 532.05 Mécanique des fluides et des liquides - Dynamique (cinétique et cinématique) Résumé : Dans le but de simuler l’extrusion de polym`eres, nous utilisons le mod`ele pom-pom pour d´ecrire le comportement
en ´ecoulement. Ce mod`ele d´ecrit l’´etat du polym`ere avec deux variables mol´eculaires : l’´etirement et l’orientation
des chaˆınes. Nous proposons une partition des d´eformations ´elastiques et visqueuses qui permet d’obtenir un probl`eme
elliptique relatif aux ´equations d’´equilibres. Dans les simulations num´eriques, une m´ethode explicite a ´et´e utilis´ee avec
une technique d’´el´ements finis pour r´esoudre le probl`eme cin´ematique et une technique de Galerkin discontinue pour
r´esoudre les probl`emes de convection. Nous observons sur un exemple de contraction tridimensionnelle les champs de
vitesse et d’´etirement.En ligne : http://www.legfr.fr/larevue/index.php?Page=article&Vol=0001&NumArticle=0 Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=5566
in RHEOLOGIE > Vol. 1 (08/2002) . - p. 1-10[article]Star oligomers and hyperbranched polymers in low VOC polyurethane coatings : Part III / J. Huybrechts in SURFACE COATINGS INTERNATIONAL, Vol. 81, N° 5 (05/1998)
[article]
Titre : Star oligomers and hyperbranched polymers in low VOC polyurethane coatings : Part III Type de document : texte imprimé Auteurs : J. Huybrechts, Auteur ; K. Dusek, Auteur Année de publication : 1998 Article en page(s) : p. 234-239 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Formulation (Génie chimique)
Liants
Oligomères
Polymères ramifiés
Polyuréthanes
Revêtements bi-composantIndex. décimale : 667.9 Revêtements et enduits Résumé : Hydroxyl funtional star and dendritic oligomers with a precise control of molecular weight, functionality and structure can be prepared by ring-opening polycondensation. Such polyols can be used in 2-component polyurethane (or repair points with a VOC (Volatile Organic Compound) less than 3.5 (pounds per gallons). Using the theory of branching processes, the extent of reaction at gel, gel times and molecular weight buildup during reaction with a trifunctional polyisocyanate can be calculated as a function of the functionality of the oligomer. This paper discusses those theoretical predictions and compares the results with the crosslinking behaviour of star and dendritic oligomers and blends in a 3.5 VOC compliant refinishing clear coat. Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=16637
in SURFACE COATINGS INTERNATIONAL > Vol. 81, N° 5 (05/1998) . - p. 234-239[article]Réservation
Réserver ce document
Exemplaires (2)
Code-barres Cote Support Localisation Section Disponibilité 14290 - Périodique Bibliothèque principale Documentaires Disponible 14289 - Périodique Bibliothèque principale Documentaires Disponible Steady rheological behaviors of UV-curable waterborne hyperbranched polyurethane acrylate dispersions / Wenhua Yin in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 10, N° 1 (01/2013)
PermalinkStrategies towards multicompartment polymeric micelles / André Laschewsky in ACTUALITES G.F.P., N° 99 (10/2004)
PermalinkStudies on copolymers based on polyurethane-urea / Kavita Prakash in PAINTINDIA, Vol. LXIII, N° 2 (02/2013)
PermalinkStudy of rheology and plug assist thermoforming of linear and branched PP homopolymer and impact copolymer / Deepti Marathe in INTERNATIONAL POLYMER PROCESSING, Vol. XXXIV, N° 3 (07/2019)
PermalinkPermalinkSynthesis and application of highly branched polymers as filling-retanning agents / Chai Yuye in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 94, N° 5 (09-10/2010)
PermalinkSynthesis and characterization of castor oil-based branched polyols from renewable resources and their polyurethane-urea coatings / Allauddin Shaik in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 16, N° 2 (03/2019)
PermalinkSynthesis and characterization of solvent-free hybrid alkyd resin with hyperbranched melamine core / Güngör Gündüz in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 15, N° 4 (07/2018)
PermalinkSynthesis and characterization of waterborne polyurethane thickeners based on hyperbranched polyester / Andong Xie in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 12, N° 2 (03/2015)
PermalinkSynthesis and properties of hydroxyl-terminated hyperbranched poly isocyanurate-ester retanning agents / Ren Long-Fang in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXII, N° 7 (07/2017)
PermalinkSynthesis and properties of multiarm star hydroxyl-terminated polyesters for two-component polyurethane coatings / Shan Huang in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 14, N° 3 (05/2017)
PermalinkSynthesis and properties of nitrogen heterocycle-functionalized core-shell hyperbranched polyester / Subramanian Karpagam in INTERNATIONAL POLYMER PROCESSING, Vol. XXX, N° 2 (05/2015)
PermalinkSynthesis and properties of a novel UV-curable waterborne hyperbranched polyurethane / Xufeng Lin in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 11, N° 3 (05/2014)
PermalinkSynthesis, characterization, and UV curing of acrylate functional hyperbranched polyester resins / Mats Johansson in JOURNAL OF COATINGS TECHNOLOGY (JCT), Vol. 67, N° 849 (10/1995)
PermalinkSynthesis of fully bio-based branched unsaturated polyester oligomers and UV curing coatings / Caixing Feng in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 20, N° 5 (09/2023)
PermalinkSynthesis of a novel hyperbranched polyester with carboxyl end groups applied to UV-curable waterborne coating / Jieming Liu in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 18, N° 1 (01/2021)
PermalinkSynthesis of silver nanoparticles embedded novel hyperbranched urethane alkyd-based nanocomposite for high solid antimicrobial coating application / D. Ratna in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 12, N° 6 (11/2015)
PermalinkSynthesis of xylitol-based hyperbranched polyurethane acrylate and its application in self-matting acrylate coatings / Ruijun Lin in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 20, N° 5 (09/2023)
PermalinkSynthesis, photopolymerization kinetics, and thermal properties of UV-curable waterborne hyperbranched polyurethane acrylate dispersions / Wenhua Yin in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 8, N° 5 (10/2011)
PermalinkSynthesis, properties and application in leather colouration of novel polymeric dye based on hyperbranched poly(amine-ester) / Yulu Wang in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 101, N° 4 (07-08/2017)
Permalink