The stability of ultrathin polymer films plays a crucial role in their technological applications. Here, we systematically investigated the influence of interfacial adsorption in physical aging and the stability of thin polymer films in the solvent-induced process. We further identify the stability mechanism from the theory of thin film stability. Our results show that the aging temperature and film thickness can strongly influence the stability of thin PS films in acetone vapor. Physical aging can greatly improve the stability of thin polymer films when the aging temperature T_aging1 > T_g. A thinner PS film more quickly reaches a stable state via physical aging. At short aging time, the formation of the adsorbed layer can reduce the polar interaction; however, it slightly influences the stability of thin polymer films in the solvent-induced process. At later aging stage, the conformational rearrangement of the polymer chains induced by the interfacial effect at the aging temperature T_aging1 plays an important role in stabilizing the thin polymer films. However, at T_aging2 < T_g, the process of physical aging slightly influences the stability of the thin polymer films. The formation of the adsorbed layer at T_aging2 can reduce the short-range polar interaction of the thin film system and cannot suppress the instability of thin polymer films in the solvent-induced process. These results provide further insight into the stable mechanism of thin polymer films in the solvent-induced process.

超薄聚合物薄膜的稳定性在其技术应用中起着至关重要的作用。在这里，我们系统地研究了界面吸附对物理老化的影响以及溶剂诱导过程中聚合物薄膜的稳定性。我们从薄膜稳定性理论进一步确定了稳定性机理。我们的结果表明，时效温度和膜厚会强烈影响PS薄膜在丙酮蒸气中的稳定性。当时_效温度T _ageing1 > T _g时，物理时效可以大大改善聚合物薄膜的稳定性。较薄的PS膜可通过以下途径更快地达到稳定状态身体老化。在较短的老化时间下，吸附层的形成可以减少极性相互作用。但是，它在溶剂诱导的过程中对聚合物薄膜的稳定性有轻微的影响。在随后的老化阶段，在老化温度T _ageing1下，界面效应引起的聚合物链构象重排在稳定聚合物薄膜方面起着重要作用。然而，在T _ageing2＜T _g时，物理老化的过程会稍微影响聚合物薄膜的稳定性。T_老化时吸附层的形成₂可以减少薄膜系统的短程极性相互作用，并且不能抑制溶剂诱导的过程中聚合物薄膜的不稳定性。这些结果提供了对溶剂诱导的过程中聚合物薄膜稳定机制的进一步了解。