[article]
| Titre : |
Surface properties of polymers |
| Type de document : |
texte imprimé |
| Auteurs : |
Tipanna Melkeri, Auteur |
| Année de publication : |
2020 |
| Article en page(s) : |
p. 93-99 |
| Langues : |
Anglais (eng) |
| Catégories : |
Angle de contact
Energie de surface
Polymères -- Surfaces
Rugosité
Tension superficielle
|
| Index. décimale : |
668.9 Polymères |
| Résumé : |
The surface energy, surface tension and contact angle of the polymers are related to surface properties of polymers. Surface properties are important in many applications of polymer as paint, inks and adhesives. Surface tension is the tendency of fluid surfaces to shrink into the minimum surface area possible. Surface tension is an important factor in the phenomenon of capillarity. Capiilary rise method and Stallagmometer method - drop weight method are widely used methods for measuring surface tension. The contact angle is the angle, conventionally measured through the liquid, where a liquid-vapor interface meets a solid surface. If 0 = 0 °, the liquid completely wets the substrate. If ° < 0 < 90 °, high wetting occurs. If 90 ° < 9 < 180°, low wetting occurs and If 0 = 180 °, the liquid does not wet the substrate at all. Surface roughness has a strong effect on the contact angle and wettabiIity of a surface. The surface energy may therefore be defined as the excess energy at the surface of a material compared to the buIk, or it is the work required to buiId an area of a particular surface. Another way to view the surface energy is to relate it to the work required to cut a bulk sample, creating two surfaces. Surface energy comes into play in wetting phenomena. The spreading parameter "S" can be used to nnathematically determine this. If S < 0, the liquid partially wets the substrate. If S > 0, the liquid completely wets the substrate. Surface energy of solid polymer is determined by using Zisman theory and the Owens/Wendt theory. |
| Note de contenu : |
- SURFACE PROPERTIES
- SURFACE TENSION : In terms of force - In terms of energy
- METHODS OF SURFACE TENSION MEASUREMENTS : Capillary rise method - Drop volume method -stalagmometric method
- CONTACT ANGLE
- EFFECT OF ROUGHNESS TO CONTACT ANGLES
- DYNAMIC CONTACT ANGLES
- DETERMINATION OF CONTACT ANGLE : The static sessile drop method - Advantages and disadvantages - The pendant drop method - The dynamic sessile drop method - Dynamic Wilhelmy method - Advantages and disadvantages
- SURFACE FREE ENERGY
- SPREADING PARAMETER
- DETERMINATION OF SURFACE ENERGY : Based on the Zisman theory
- THE OWENS/WENDT THEORY
- Table : Surface energy and contact angle of the few commercial polymers |
| En ligne : |
https://drive.google.com/file/d/1w1fuu3OMnTXt7BH-CbrWjRRhW2YjCq2X/view?usp=drive [...] |
| Format de la ressource électronique : |
Pdf |
| Permalink : |
https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=34656 |
in PAINTINDIA > Vol. LXX, N° 3 (03/2020) . - p. 93-99
[article]
|
Aller sur edunet
Accueil
Surface properties of polymers in PAINTINDIA, Vol. LXX, N° 3 (03/2020)
