改性聚硅氧烷/纳米SiO_2杂化膜的制备与疏水性

Synthesis of modified polysiloxane/nano-silica hybrid film and its hydrophobicity

先以甲基丙烯酸十八醇酯(SMA)、烯丙基缩水甘油醚(AGE)和含氢硅油(PHMS)的硅氢加成反应制得一种梳状结构的十八酯基/环氧基改性聚硅氧烷(PSAMS),再通过其与氨基功能改性纳米SiO2间的接枝共聚反应制备了一种改性聚硅氧烷/纳米SiO2杂化材料(PSAMS-SiO2)。采用一次浸渍法,简便地在天然棉纤维表面制得对水的静态接触角达157°的改性聚硅氧烷/纳米SiO2杂化膜。用红外光谱(FT-IR)、X射线光电子能谱(XPS)、热重分析仪(TGA)、扫描电子显微镜(SEM)、静态接触角测量仪等仪器研究了杂化材料的结构、热稳定性、膜微观形态和疏水性。TGA分析表明杂化材料的热稳定性明显提高;XPS和SEM观察证实了棉纤维表面的疏水杂化膜和大量仿荷叶效应的纳米微突体。随PSAMS-SiO2用量增加,膜超疏水性能提高。

A novel modified polysiloxane/nano-silica hybrid material(PSAMS-SiO2) with comb structure was prepared via sol-gel and graft copolymerization methods and then a superhydrophobic hybrid film on cotton fabric was also constructed with contact angle of water on its surface 157° through immersing-padding-baking processes.Chemical structure,thermal stability,micro-morphology and hydrophobicity of the hybrid material or film were investigated by the Fourier transform infrared spectrum(FT-IR),thermo-gravimetric analyzer(TGA),X-ray photoelectron spectroscopy(XPS),scanning electron microscopy(SEM) and static contact angle analyzer,respectively.Results showed that thermal stability of the hybrid material was improved compared to modified polysiloxane,a hydrophobic hybrid film and many lotus-leaf-like micro-nano scale tubercles were coated on the surface of cotton fabrics which were the reasons why cotton fabric changed from hydrophilicity to hydrophobicity.In addition,with increase of the amount of PSAMS-SiO2,superhydrophobicity of the cotton fabrics increased.