侧链含氟聚氨酯的表面相结构及其表面性能研究

Study on the Surface Morphology and Property of Poly (ε-caprolactone urethane)s with Fluorinated Side Chains

将N-(2-羟基-1-羟甲基-1-甲基-乙基)-2-(2,2,3,3,4,4,5,5,6,6,7,7,8,8,8-全氟辛氧基)-乙酰胺(HPFOAD)作为扩链剂引入到聚己内酯聚氨酯的硬段上,制备出一系列带有氟烷基侧链的聚氨酯材料(FP-CLU-s),并对这些含氟聚氨酯材料的表面相结构及表面性能进行了分析。衰减全反射傅里叶变换红外光谱(ATR-FTIR)分析表明连接在硬段上的含氟侧链促进了聚氨酯表面软硬段的微相分离。原子力显微镜(AFM)表明,随着含氟基团的引入,聚氨酯的表面形貌发生了显著改变,极大地降低了聚氨酯的表面粗糙度(RMS)。静态水/二碘甲烷接触角测试及表面能计算的结果表明含氟侧链倾向于向材料表面富集,将氟碳链端的-CF3基团充分暴露出来,这是导致侧链含氟聚氨酯优异表面性能的主要原因。

N-（2-hydroxy-1-hydroxymethyl-1-methyl-ethyl）-2-（2,2,3,3,4,4,5,5,6,6,7,7,8,8,8-pentadecafluoro-octyloxy）-acetamide（HPFOAD）,a fluorinated alky side-chain diol,was introduced to poly（ε-caprolactone urethane）s as a chain extender,a series of fluorinated poly（ε-caprolactone urethane）s（FPCLUs） was obtained,and their surface morphology and properties were investigated.ATR-FTIR results indicated that the fluorinated side chains attached on the hard block can promote the microphase separation on the surface of polyurethane.AFM images revealed that the surface topography of polyurethane obviously changed when fluorinated groups were introduced,and RMS values were decreased dramatically.Stationary H2O/CH2I2 contact angles and the calculated surface energy indicated that the fluorinated side chains tend to accumulate on the surface of materials and the-CF3 groups exposed to the outmost surface,resulting in the excellent surface properties of FPCLUs.