Lequeux François, Talini Laurence, Verneuil Emilie, Delannoy Guillaume, Valois Pauline
École Supérieure de Physique et de Chimie Industrielles de la Ville de Paris (ESPCI) ParisTech, PSL Research University, Sciences et Ingénierie de la matière Molle, CNRS UMR7615, 10, Rue Vauquelin, F-75231, Paris Cedex 05, France.
Sorbonne-Universités, UPMC Univ. Paris 06, SIMM, 10, Rue Vauquelin, F-75231, Paris Cedex 05, France.
Eur Phys J E Soft Matter. 2016 Feb;39(2):12. doi: 10.1140/epje/i2016-16012-y. Epub 2016 Feb 25.
We review the studies on the wetting of soluble polymeric substrates by their solvents, both in the literature and conducted in our group in the past decade. When a droplet of solvent spreads on a soluble polymer layer, its wetting angle can strongly vary with the contact line velocity even at capillary numbers smaller than unity, in contrast to non-soluble substrates. The solvent content in the polymer is a key parameter for the spreading dynamics; that content is set by the initial conditions, but also by the transfers occurring from the droplet to the polymer layer during spreading. We focus on hydrophilic amorphous polymers that are glassy at room temperature, and we discuss the consequences on wetting of the very large changes in the polymer physical properties induced by solvent sorption. We finally present new results on polymers of varying molar masses, and show how they open new perspectives for a better understanding of powder dissolution.
我们回顾了过去十年间文献中以及我们团队开展的关于溶剂对可溶性聚合物基底润湿性的研究。当一滴溶剂在可溶性聚合物层上铺展时，即使在毛细管数小于1的情况下，其接触角也会随接触线速度大幅变化，这与不可溶性基底的情况不同。聚合物中的溶剂含量是铺展动力学的关键参数；该含量由初始条件决定，同时也取决于铺展过程中从液滴到聚合物层发生的物质转移。我们聚焦于室温下呈玻璃态的亲水性无定形聚合物，并讨论溶剂吸附引起的聚合物物理性质的巨大变化对润湿性的影响。最后，我们展示了不同摩尔质量聚合物的新研究结果，并说明这些结果如何为更好地理解粉末溶解开辟新的视角。
