FLIP-FLOP Tpye Soil Repellent and Release Finishing by th Oligomers Containing End-Capped Fluoroalkyls.

以全氟烷酰基过氧化物和聚氧乙烯甲基丙烯酸酯为原料合成了全氟烷基封端丙烯酸酯齐聚物，在对聚酯表面进行改性的基础上，研究了其SR效率，在疏水环境下，聚酯表面改性为疏油的，其表面自由能小于25 mj/m^2，分散性和极性分量分别为16-18 mj/m^2和2-6 mj/m^2，分别ESCA分析结果表明，氟烷基在改性后的表面具有较好的抗油性能，但随着时间的延长，改性后的表面与水的接触角逐渐减小，低于未改性的表面。这可以解释为在亲水性聚氧乙烯基的作用下，聚氧乙烯基团溶胀出表面，使表面变得比原来更亲水。用不同极性的模拟油污进行的洗涤实验也支持了丙烯酸酯低聚物的FLIP-FLOP作用，并合成了一种含氟烷基和吗啉基的新型低聚硅烷偶联剂。用这些低聚硅烷改性的玻璃表面也表现出FLIP-FLOP作用。纺织品的应用正在调查中。

The SR efficiency of perfluoroalkyl end-capped acrylate oligomers, which were synthesized from perfluoroalkanoyl peroxides and polyoxyethylene methacylates, was ezamined based on the modification of polyester surface.Under hydrophobic environment, polyester surfaces were modified to be oleophobic and their surface free energies were less than 25 mj/m^2, the dispersive and polar components of which were 16-18 and 2-6 mj/m^2, respectively. Based on the ESCA analysis, the fluoroalkyl groups are proved to be oriented to the air to provide an oil repellent surface.On the other hand, with the elapse of time, the contact angles of water on the modified surface decreased below that of unmodified one. It can be interpreted that under hydrophilic environmant polyoxyethylene groups swell out the surface and the surface is changed to be more hydrophilic the original one. This is Called FLIP-FLOP mechanism.Washing experiments using model oily soil haning various polarities also supported the FLIP-FLOP action of the acrylate oligomers.Moreover, a novel type oligomeric silane coupling agent having fluoroalkyls and morpholide group was synthesized similarly. Glass surface modified with those oligomeric silanes also showed the FLIP-FLOP action. Application to textiles are now under investigation.