Surface with low energy plays an irreplaceable role in antifouling coatings, national defense and military industry. However, low-energy surface has poor surface stability, which leads to the difficulty of recovery and massive waste. Thus, it is urgent to exploit low surface free energy materials with excellent surface stability. In this work, a series of ionic liquid-reinforced polybenzoxazine/urethane (poly(DHB/PU)) films was prepared, the dihydroxybenzoxazine (DHB), stearyldiethanolamine (SDEA) and hydroxyl-terminated polydimethylsiloxane (HTPDMS) introduced into the molecular chains provide the films low-surface-energy properties. Then, 1-ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide ionic liquid (IL) were added into the poly(DHB/PU) system. The comprehensive properties of the modified films were further improved, including recoverability, outstanding thermal stability (10 % weight loss temperature ranged from 270.51 to 308.51 °C), solvent resistance and low surface free energy (average 20 mN/m). Besides, the dense hydrogen bonds formed between imidazolium groups in IL and carbamates are the critical factor for optimizations of compatibility and mechanical properties. The higher the content of IL, the better the compatibility, the better the mechanical properties (elastic modulus varied from 63.32 MPa to 124.57 MPa) and the lower the peel strength (<7.975 gf/in) of the films. The synthesized polymer has great potential in the application of recoverable adhesive tape substrate.

低能表面在防污涂料、国防军工等方面具有不可替代的作用。然而，低能表面的表面稳定性较差，导致回收困难和大量浪费。因此，开发具有优异表面稳定性的低表面自由能材料迫在眉睫。在这项工作中，制备了一系列离子液体增强的聚苯并恶嗪/聚氨酯（聚（DHB / PU））薄膜，分子链中引入二羟基苯并恶嗪（DHB），硬脂基二乙醇胺（SDEA）和羟基封端的聚二甲基硅氧烷（HTPDMS）提供薄膜的低表面能特性。然后，将 1-乙基-3-甲基咪唑双（三氟甲基磺酰基）亚胺离子液体（IL）添加到聚（DHB/PU）体系中。改性薄膜的综合性能进一步提高，包括可恢复性、出色的热稳定性（10% 重量损失温度范围为 270.51 至 308.51 °C）、耐溶剂性和低表面自由能（平均 20 mN/m）。此外，离子液体中的咪唑基团与氨基甲酸酯之间形成的致密氢键是优化相容性和机械性能的关键因素。IL 含量越高，相容性越好，薄膜的机械性能（弹性模量从 63.32 MPa 到 124.57 MPa）越好，剥离强度（<7.975 gf/in）越低。所合成的聚合物在可回收胶带基材的应用中具有巨大的潜力。IL 中的咪唑基团与氨基甲酸酯之间形成的致密氢键是优化相容性和机械性能的关键因素。IL 含量越高，相容性越好，薄膜的机械性能（弹性模量从 63.32 MPa 到 124.57 MPa）越好，剥离强度（<7.975 gf/in）越低。所合成的聚合物在可回收胶带基材的应用中具有巨大的潜力。IL 中的咪唑基团与氨基甲酸酯之间形成的致密氢键是优化相容性和机械性能的关键因素。IL 含量越高，相容性越好，薄膜的机械性能（弹性模量从 63.32 MPa 到 124.57 MPa）越好，剥离强度（<7.975 gf/in）越低。所合成的聚合物在可回收胶带基材的应用中具有巨大的潜力。975 gf/in) 的薄膜。所合成的聚合物在可回收胶带基材的应用中具有巨大的潜力。975 gf/in) 的薄膜。所合成的聚合物在可回收胶带基材的应用中具有巨大的潜力。