| Titre : |
Dual approach of bimodality and nano-reinforcement towards toughened PDMS based foul release coatings |
| Type de document : |
texte imprimé |
| Auteurs : |
Sangram K. Rath, Auteur ; S. Praveen, Auteur ; Jayesh G. Chavan, Auteur ; Srikanth Billa, Auteur ; T. Umasankar Patro, Auteur ; Manoranjan Patri, Auteur |
| Année de publication : |
2021 |
| Article en page(s) : |
p. 871-885 |
| Note générale : |
Bibliogr. |
| Langues : |
Américain (ame) |
| Catégories : |
Angle de contact
Argile
Caractérisation
Dispersions et suspensions
Mouillabilité
Nanoparticules
PolydiméthylsiloxaneLe polydiméthylsiloxane —[O-Si(CH3)2]n—, ou poly(diméthylsiloxane) selon la nomenclature systématique, communément appelé PDMS ou diméthicone, est un polymère organominéral de la famille des siloxanes souvent présent dans les shampoings. On l'y ajoute pour augmenter le volume des cheveux mais il peut également aller boucher les pores du cuir chevelu et rendre les cheveux gras. C'est une des raisons pour lesquelles se laver les cheveux tous les jours est très déconseillé avec un shampooing contenant des silicones.
Il existe également de l'amodiméthicone, qui est un dérivé du diméthicone.
Le polydiméthylsiloxane est un additif alimentaire (E900), utilisé comme antimoussant dans les boissons (Coca-Cola BlāK).
La chaîne de poly(diméthylsiloxane) forme également la structure de base des huiles et des caoutchoucs silicones.
Renfort minéral
Revêtements -- Propriétés mécaniques
Revêtements antisalissures
|
| Index. décimale : |
667.9 Revêtements et enduits |
| Résumé : |
It is well established that crosslinked polydimethylsiloxane (PDMS) based coatings have efficacious foul release characteristics. However, a trade-off between mechanical integrity of filled and crosslinked PDMS based coatings and their foul release performance has been a bottleneck for producing efficient and durable coatings. In the present study, we report a dual approach of nano-reinforcement of a bimodal PDMS network as a strategy to produce simultaneously reinforced and toughened PDMS networks with facile release of macrofoulants from their surfaces. The nanocomposites of both unimodal and bimodal PDMS networks were prepared using oligomeric dihydroxyl functional PDMS precursor chains differing in their molecular weights by a factor of five and commercial Cloisite-20A nanoclay as the nanofiller. The clay layers were found to be mildly intercalated in the PDMS matrix, as revealed from investigations by scattering and imaging techniques at different length scales. While the unimodal PDMS networks did show nanoclay induced simultaneous reinforcement and toughening, at equivalent clay loadings, the bimodal PDMS nanocomposites seemed to stretch further with characteristic strain hardening before fracture. Dynamic mechanical analysis (DMA) and swelling studies of the nancomposites further confirmed the nanoclay induced reinforcement effect of the bimodal PDMS host matrix. The intrinsic low surface energy characteristics of PDMS were retained by bimodal blending of long and short chains and its subsequent nano-reinforcement. Macrofouling studies by panel immersion and release force measurements revealed that the macrofoulants could be dislodged from the nanocomposite coatings with a shear force < 0.05 MPa. |
| Note de contenu : |
- EXPERIMENTAL : Materials - Preparation of unimodal and bimodal PDMS networks and their nanocomposites - Characterization techniques
- RESULTS AND DISCUSSION : Clay dispersion morphology - Surface wettability
- MECHANICAL PROPERTIES
- SWEELING STUDIES : Macrofouling and foul release characteristics
- Table 1 : Contact angle and surface energy of pristin unimodal and bimodal PDMS networks and their nanocomposites
- Table 2 : Tensile properties of unimodal and bimodal PDMS networks and their nanocomposites at different clay loadings |
| DOI : |
https://doi.org/10.1007/s11998-020-00450-0 |
| En ligne : |
https://link.springer.com/content/pdf/10.1007/s11998-020-00450-0.pdf |
| Format de la ressource électronique : |
Pdf |
| Permalink : |
https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=35936 |
in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 18, N° 3 (05/2021) . - p. 871-885
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Dual approach of bimodality and nano-reinforcement towards toughened PDMS based foul release coatings in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 18, N° 3 (05/2021)
