Lee Jineun, Kim Yoona, Kwak Giseop
Department of Polymer Science & Engineering, Polymeric Nanomaterials Laboratory, Kyungpook National University, 1370 Sankyuk-Dong, Buk-Ku, Daegu, 702-701, Republic of Korea.
Small. 2025 Jun;21(25):e2503079. doi: 10.1002/smll.202503079. Epub 2025 May 2.
A novel polyimide (PI) with a carboxyl side group is synthesized. Cross-linked hybrid films are prepared by adding a small amount of PI to polyvinyl alcohol (PVA), causing esterification and etherification reactions during the convection drying process. The physical properties of the hybrid films vary significantly depending on the PI content and drying temperature. The higher the PI content and the drying temperature, the higher the cross-linking density. In particular, the hybrid film (PVA/PI4 film) containing 4 wt.% PI relative to PVA can most effectively suppress the thermal decomposition of PVA during the high-temperature drying process at 170 °C, preventing yellowing. When PI exceeds 6 wt.% relative to PVA, phase separation occurs, and the hybrid film becomes opaque. PVA/PI4 film demonstrates excellent water resistance, tensile strength, surface friction resistance, impact resistance, and glass adhesion properties due to its appropriately cross-linked structure. No fogging is observed when the coated surface is exposed to water vapor. The present PVA/PI hybrid film is expected to be used semi-permanently as an anti-fog coating material, even in high-temperature and high-humidity environments. This research will serve as a technical guide for the development of advanced functional films based on PVA and PI in the future.
合成了一种带有羧基侧基的新型聚酰亚胺（PI）。通过向聚乙烯醇（PVA）中添加少量PI制备交联杂化膜，在对流干燥过程中会发生酯化和醚化反应。杂化膜的物理性能随PI含量和干燥温度的变化而显著不同。PI含量和干燥温度越高，交联密度越高。特别是，相对于PVA含有4 wt.% PI的杂化膜（PVA/PI4膜）在170℃的高温干燥过程中能最有效地抑制PVA的热分解，防止泛黄。当PI相对于PVA超过6 wt.%时，会发生相分离，杂化膜变得不透明。由于其适当的交联结构，PVA/PI4膜表现出优异的耐水性、拉伸强度、表面摩擦阻力、抗冲击性和玻璃粘附性能。当涂覆表面暴露于水蒸气时未观察到起雾现象。即使在高温高湿环境下，目前的PVA/PI杂化膜有望作为防雾涂层材料长期使用。本研究将为未来基于PVA和PI的先进功能膜的开发提供技术指导。
