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非离子型表面活性剂具有良好的乳化、清洗、发泡、润湿等作用,它们在纺织、机械、轻工、石油化工等工业部门以及人们的日常生活中,已经得到了广泛的应用。最近十多年来,随着相转移催化技术的迅速发展,冠醚作为一种出色的相转移催化剂越来越受到人们的重视。然而,由于冠醚的制备极其困难,价格十分昂贵,而且还有毒性,这就使它的应用受到很大限制。具有链状聚氧乙烯结构的化合物与冠醚有类似的性质,
Nonionic surfactants have good emulsifying, cleaning, foaming, wetting and other effects, they have been widely used in textile, machinery, light industry, petrochemical and other industrial sectors and people’s daily lives. In recent ten years, with the rapid development of phase transfer catalysis, crown ether has drawn more and more attention as an excellent phase transfer catalyst. However, the use of crown ethers is extremely limited because of their extremely difficult preparation, high cost and toxicity. Compounds having a chain polyoxyethylene structure have similar properties as crown ethers,