采用聚偏二氟乙烯(PVDF)对纤维素滤纸(FP)进行改性,通过简单的浸泡-干燥方法,制备了具有湿敏性和颜色可逆的PVDF/FP复合膜,利用场发射扫描电子显微镜、X射线能量色散谱仪、傅里叶变换红外光谱仪、接触角测定仪、荧光分光光度计对其结构和性能进行了表征。结果表明,PVDF/FP复合膜表现出一定的疏水性,接触角为105.6°;但水滴会缓慢渗透到PVDF/FP复合膜的织物结构中,使其颜色由原来的浅蓝色变为深蓝色。在空气中蒸发去除水分后,可使PVDF/FP复合膜恢复原色,而引起这种颜色可逆变化的主要原因是用PVDF改性的复合膜与水的折射率的变化。
Cellulose filter paper (FP) was modified by polyvinylidene difluoride (PVDF),and the PVDF/FP composite film with humidity sensitivity and color reversible was prepared by a simple soaking-drying method.The structure and properties of the composite films were tested by field emission scanning electron microscopy,X-ray energy dispersion spectrometer,Fourier transform infrared spectrometer,contact angle analyzer and fluorescence spectrophotometer.The results showed that the PVDF/FP composite film showed a certain hydrophobicity and the contact angle was 105.6°.However,the water droplets will slowly penetrate into the fabric structure of PVDF/FP,making its color change from the original light blue to dark blue.The original color of PVDF/FP can be restored after the removal of water by evaporation in the air.The main reason for the reversible color change was the change of refractive index between the PVDF modified composite film and water.
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基金资助
国家博士后基金项目(2017M611696);江苏省博士后科学基金(1701012B)
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