Drying process paths, i.e., time-dependent trajectories of solution compositions on a phase diagram, were examined for coatings of a water-immiscible acrylic monomer dissolved in ethanol and exposed to humidity. The absorption of water vapor quenched the solution into a thermodynamic nonequilibrium state and promoted a spontaneous phase separation when the water content in the solution exceeded a critical value. A simultaneous mass-loss and heat-flux measurement technique was proposed and adapted for phase-separating coatings to determine the evaporation rates of two volatile components with different latent heats of vaporization. The measured drying paths agreed with those predicted from a drying model that takes into account the gas-diffusion-limited evaporation and composition-dependent activities. The numerical predictions also revealed that the pseudo-azeotrope determined the critical drying conditions, under which any drying paths on the phase diagram did not cross the two-phase region, and thus the drying solutions remained stable.

对于溶解在乙醇中并暴露于湿气的与水不混溶的丙烯酸单体的涂层，检查了干燥过程的路径，即相图上溶液成分随时间变化的轨迹。当溶液中的水含量超过临界值时，水蒸气的吸收使溶液淬灭成热力学非平衡状态并促进自发相分离。提出了一种同时进行的质量损失和热通量测量技术，该技术适用于相分离涂层，以确定具有不同蒸发潜热的两种挥发性组分的蒸发速率。测得的干燥路径与从干燥模型预测的干燥路径一致，该干燥模型考虑了气体扩散限制的蒸发和成分依赖性的活动。