| Titre : |
Roll-to-roll hot embossing of high aspect ratio micro pillars for superhydrophobic applications |
| Type de document : |
texte imprimé |
| Auteurs : |
N. Kodihalli Shivaprakash, Auteur ; J. Zhang, Auteur ; T. Nahun, Auteur ; C. Barry, Auteur ; Q. Truong, Auteur ; J. Mead, Auteur |
| Année de publication : |
2019 |
| Article en page(s) : |
p. 502–512 |
| Note générale : |
Bibliogr. |
| Langues : |
Anglais (eng) |
| Catégories : |
Analyse mécanique dynamique
Angle de contact
Couches minces
Gaufrage à chaud
Hydrophobie
Perfluorooctyltrichlorosilane
PolyamidesUn polyamide est un polymère contenant des fonctions amides -C(=O)-NH- résultant d'une réaction de polycondensation entre les fonctions acide carboxylique et amine.
Selon la composition de leur chaîne squelettique, les polyamides sont classés en aliphatiques, semi-aromatiques et aromatiques. Selon le type d'unités répétitives, les polyamides peuvent être des homopolymères ou des copolymères.
Surfaces (technologie)
|
| Index. décimale : |
668.4 Plastiques, vinyles |
| Résumé : |
Many surfaces in nature such as the lotus leaf, cicada wings, water spider legs and gecko feet have attracted attention due to their inherent superhydrophobicity and self-cleaning properties. These surfaces are characterized by water contact angles greater than 150° and contact angle hysteresis < 10°. In this work, a continuous fabrication methodology for production of such superhydrophobic surfaces consisting of well-ordered micro-pillar structures (aspect ratio greater than 1 (1.3)) on a large area polyamide film using roll-to-roll hot embossing process was demonstrated. It was found that the temperature played a significant role in replication. Incomplete replication was observed in regime 1 (150 to 155 °C) and the height of replication was influenced by nip pressure and roll speed due to viscosity variations. In contrast, complete replication was seen in regime 2 (190 to 195 °C) and the height of replication was insensitive to nip pressure and roll speed due to a fairly constant viscosity value. The embossed polyamide surface, once coated with a low surface energy 1H, 1H, 2H, 2H-perfluorooctyltrichlorosilane (PFTS) monolayer, showed super-repellant characteristics with respect to water and demonstrated a successful manufacturing approach to fabricate superhydrophobic surfaces. |
| Note de contenu : |
- EXPERIMENTAL : Materials - Dynamic Mechanical Analysis (DMA) - Complex shear viscosity - Field-emission Scanning Electron Microscopy (FE-SEM) - Contact angle measurement - Flexible tooling fabrication - Fabrication of micro-pillar structures by R2R-HE |
| DOI : |
https://doi.org/10.3139/217.3815 |
| En ligne : |
https://www.hanser-elibrary.com/doi/pdf/10.3139/217.3815 |
| Format de la ressource électronique : |
Pdf |
| Permalink : |
https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=33613 |
in INTERNATIONAL POLYMER PROCESSING > Vol. XXXIV, N° 5 (11/2019) . - p. 502–512
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