F元素对热固性含氟聚氨酯微相分离结构的影响

摘要

Fluorinated glycol(FPO)featuring F in side chains was synthesized by FO and tetrahydrofuran(THF)via living/controlled cationic polymerization.The micro-phase structure of thermosetting fluorined polyurethane(S-FPU)was synthesized using FPO as soft segments,diphenyl methane diisocyanate(MDI)as hard segments,and triethanolamine(TEA)as chain extender.In characterization,fourier transform infrared spectrometer(FTIR)and nuclear magnetic Resonance(NMR)were used to conform the structure of S-FPU.X-ray photoelectron spectroscopy(XPS)was used to analyze the surface composition of S-FPU.FTIR,nuclear magnetic resonance instrument(SEM)and atomic force microscope(AFM)were adopted to investigate how F made the microphase separation of the bulk and surface for S-FPU.The results showed that because of the introduction of F,it reduced the micro phase separation of inside and surface of fluorined polyurethane.%通过可控阳离子聚合的方法,利用自制的含氟环氧化合物(FO)与四氢呋喃(THF)反应,制备了侧链含氟聚醚多元醇(FPO),进而以FPO作为软段,二苯基甲烷二异氰酸酯(MDI)作为硬段,三乙醇胺(TEA)为交联剂合成了一系列热固性含氟聚氨酯(S-FPU).利用FTIR、NMR测试手段确定了S-FPU结构;利用XPS测量了S-FPU的表面成分,采用SEM、AFM探究了F元素对S-FPU的体相与表面的微相分离结构的作用.结果表明,F元素的引入降低了含氟聚氨酯本体、表面微相分离结构.