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Glass transition accelerates the spreading of polar solvents on a soluble polymer.

Dupas, J, Verneuil, E, Van Landeghem, M, Bresson, B, Forny, L, Ramaioli, M, Lequeux, F and Talini, L (2014) Glass transition accelerates the spreading of polar solvents on a soluble polymer. Phys Rev Lett, 112 (18).

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We study the wetting of polymer layers by polar solvents. As previously observed, when a droplet of solvent spreads, both its contact angle and velocity decrease with time as a result of solvent transfers from the droplet to the substrate. We show that, when the polymer is initially glassy, the angle decreases steeply for a given value of the velocity, Ug. We demonstrate that those variations result from a plasticization, i.e., a glass transition, undergone by the polymer layer during spreading, owing to the increase of its solvent content. By analyzing previous predictions on the wetting of rigid and soft viscoelastic substrates, we relate Ug to the viscosity of the polymer gel close to the glass transition. Finally, we derive an analytical prediction for Ug based on existing predictions for the water transfer from the droplet to the substrate. Using polar solvents of different natures, we show that the experimental data compare well to the predicted expression for Ug.

Item Type: Article
Divisions : Surrey research (other units)
Authors :
Dupas, J
Verneuil, E
Van Landeghem, M
Bresson, B
Forny, L
Lequeux, F
Talini, L
Date : 9 May 2014
DOI : 10.1103/PhysRevLett.112.188302
Related URLs :
Depositing User : Symplectic Elements
Date Deposited : 17 May 2017 13:22
Last Modified : 24 Jan 2020 23:51

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