A base-free catalytic system for the aerobic oxidation of 5-hydroxymethyl-2-furfural was exploited by using Pt nanoparticles immobilized onto a thermoresponsive poly(acrylamide-co-acrylonitrile)-b-poly(N-vinylimidazole) block copolymer, with an upper critical solution temperature of about 45 °C. The Pt nanocatalysts were well-dispersed and highly active for the base-free oxidation of 5-hydroxymethyl-2-furfural by molecular oxygen in water, affording high yields of 2,5-furandicarboxylic acid (up to >99.9%). The imidazole groups in the block copolymer were conducive to the improvement of catalytic performance. Moreover, the catalysts could be easily separated and recovered based on their thermosensitivity by cooling the reaction system below the upper critical solution temperature. Good stability and reusability were observed over these copolymer-immobilized catalysts with no obvious decrease in catalytic activity in the five consecutive cycles.

通过使用固定在热响应性聚（丙烯酰胺-共聚-丙烯腈）-b-聚（N-乙烯基咪唑）嵌段共聚物，上限临界溶解温度约为 45°C。Pt纳米催化剂在水中分子氧对5-羟甲基-2-糠醛的无碱氧化具有良好的分散性和高活性，可提供高产率的2,5-呋喃二甲酸（高达>99.9%）。嵌段共聚物中的咪唑基团有利于催化性能的提高。此外，通过将反应体系冷却到临界溶液温度以下，催化剂可以根据它们的热敏性很容易地分离和回收。在这些共聚物固定的催化剂上观察到良好的稳定性和可重复使用性，在连续五个循环中催化活性没有明显下降。