Polymer ( IF 4.1 ) Pub Date : 2019-09-28 , DOI: 10.1016/j.polymer.2019.121846 Yi Liu , Yuji Higaki , Masaru Mukai , Atsushi Takahara
Liquid repellency of comb-shaped polyacrylates with perfluoroalkyl side-chains associates with the ordered structure of the side-chains at the surface. The molecular aggregation structure and surface properties of poly{2-[(perfluorohexylethyl)carbamate]ethyl}acrylate (PFAUr-C6) were studied using differential scanning calorimetry (DSC), polarized optical microscopy (POM), powder wide-angle X-ray diffraction (WAXD), grazing incidence wide-angle X-ray diffraction (GI-WAXD), temperature-controlled Fourier transform infrared spectroscopy (FTIR), contact angle measurements, and X-ray photoelectron spectroscopy (XPS). Poly[2-(perfluorohexyl)ethyl]acrylate (PFA-C6) was compared with PFAUr-C6 to verify the effect of carbamate linkage on the aggregation structure and surface properties. The perfluorohexyl groups in PFAUr-C6 produced a double-layered smectic structure, whereas the perfluorohexyl groups in PFA-C6 showed no ordered structure. The double-layered smectic structure in PFAUr-C6 was induced by the hydrogen bonding interaction in the carbamate linkers. PFAUr-C6 showed poor water repellency similar to PFA-C6 because of the rapid surface rearrangement. Although the perfluorohexyl groups produced smectic order structure at the film surface, the lack of positional order in the smectic layers and the low ordered structure content allowed the surface rearrangement.
中文翻译:
具有氨基甲酸酯键的聚全氟丙烯酸己酯的分子聚集结构和疏水性
具有全氟烷基侧链的梳状聚丙烯酸酯的拒液性与表面上侧链的有序结构相关。采用差示扫描量热法(DSC),偏振光学显微镜(POM),粉末广角X-射线衍射仪研究了聚{2-[(全氟己基乙基氨基甲酸酯)乙基}丙烯酸聚丙烯酸酯(PFAUr-C 6)的分子聚集结构和表面性能。射线衍射(WAXD),掠入射广角X射线衍射(GI-WAXD),温控傅立叶变换红外光谱(FTIR),接触角测量和X射线光电子能谱(XPS)。将聚[2-(全氟己基)乙基]丙烯酸酯(PFA-C 6)与PFAUr-C 6进行了比较验证氨基甲酸酯键对聚集结构和表面性质的影响。PFAUr-C 6中的全氟己基基团产生双层近晶结构,而PFA-C 6中的全氟己基基团未显示有序结构。PFAUr-C 6中的双层近晶结构是由氨基甲酸酯接头中的氢键相互作用引起的。由于快速的表面重排,PFAUr-C 6的疏水性与PFA-C 6相似。尽管全氟己基基团在膜表面产生近晶有序结构,但近晶层中缺乏位置有序性和低有序结构含量允许表面重排。