DI-UMONS : Dépôt institutionnel de l’université de Mons

Recherche transversale
(titres de publication, de périodique et noms de colloque inclus)
2021-10-29 - Colloque/Présentation - communication orale - Anglais - page(s)

Vinx Nathan , Damman Pascal , Leclère Philippe , Poleunis Claude, Delcorte Arnaud, Tessier Pierre-Yves, Snyders Rony , Thiry Damien , "Investigating the relationship between the mechanical properties of plasma polymer-like thin films and their glass transition temperature" in EDT-MAIN/NanoWal: PhD Scientific Day, ULB, Belgique, 2021

  • Codes CREF : Chimie des surfaces et des interfaces (DI1327)
  • Unités de recherche UMONS : Chimie des interactions plasma-surface (S882)
  • Instituts UMONS : Institut de Recherche en Science et Ingénierie des Matériaux (Matériaux)
  • Centres UMONS : Centre d’Innovation et de Recherche en Matériaux Polymères (CIRMAP)

Abstract(s) :

(Anglais) Plasma polymerization has become a well-established technique for the synthesis of solid organic thin films referred as plasma polymer films (PPF). Nowadays, despite a highly complex growth mechanism, it is possible to finely control the chemical composition of the PPF by a clever choice of the process parameters. On the other hand, tailoring their mechanical properties, which is a key requirement for their use is specific applications,[1] appears much more challenging. In this context, this work aims at developing an innovative way to easily tune the PPF mechanical properties, namely by externally regulating the substrate temperature (Ts) during the thin films synthesis. As a case study, propanethiol is used as a precursor. By means of state-of-the-art AFM characterization-based techniques including Peak Force Quantitative Nanomechanical Mapping (PFQNM), nano Dynamic Mechanical Analysis (nDMA) and “scratch” experiments, it has been demonstrated that the PPF mechanical behaviour dramatically evolves from a high viscous liquid (i.e. viscosity ~ 106 Pa.s), to a viscoelastic solid (loss modulus ~ 1.17 GPa, storage modulus ~ 1.61 GPa) and finally to an elastic solid (loss modulus ~ 1.95 GPa, storage modulus ~ 8.51 GPa) when increasing Ts from 10 to 45°C. This behaviour is ascribed to an increase in the surface glass transition temperature of the polymeric network. The latter has been correlated with the chemical composition through the presence of unbounded molecules acting as plasticizers and the cross-linking density of the layers. Finally, this knowledge previously acquired is exploited for the fabrication of nanopatterns by generating surface instabilities in propanethiol PPF/Al bilayer system.[2] [1] de Oliveira, J. C., Airoudj, A., Kunemann, P., Bally-Le Gall, F. and Roucoules, V., SN Applied Sciences, 2021, 3, 1-15. [2] Thiry, D., Vinx, N., Aparicio, F. J., Tessier, P. Y., Moerman, D., Leclère, P., Godfroid, T., Desprez, S. and Snyders, R., Plasma Processes and Polymers, 2020, 17, 2000119.