[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 ramifiés
|
| Index. 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 acrylates |
| En ligne : |
https://drive.google.com/file/d/1S34dhZ9slxryYLsTJRPChSSVn8QH8Imu/view?usp=share [...] |
| Format de la ressource électronique : |
Pdf |
| 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
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Role of hyper branched polymers in coatings in PAINTINDIA, Vol. LXIX, N° 12 (12/2019)
