Jaleh Babak, Gavary Negin, Fakhri Parisa, Muensit Nakatan, Taheri Soheil Mohammad
Department of Physics, Bu-Ali Sina University, Hamedan 65174, Iran.
Department of Physics, Faculty of Science, Prince of Songkla University, Songkhla 90110, Thailand.
Membranes (Basel). 2015 Jan 5;5(1):1-10. doi: 10.3390/membranes5010001.
Polyvinylidene fluoride (PVDF) membranes were exposed vertically to a high energy electron beam (EB) in air, at room temperature. The chemical changes were examined by Fourier Transform Infrared Spectroscopy (FTIR). The surface morphologies were studied by Scanning Electron Microscopy (SEM) and showed some changes in the pore size. Thermogravimetric (TGA) analysis represented an increase in the thermal stability of PVDF due to irradiation. Electron paramagnetic resonance (EPR) showed the presence of free radicals in the irradiated PVDF. The effect of EB irradiation on the electrical properties of the membranes was analyzed in order to determine the dielectric constant, and an increase in the dielectric constant was found on increasing the dose. The surface hydrophilicity of the modified membrane was characterized by water contact angle measurement. The contact angle decreased compared to the original angle, indicating an improvement of surface hydrophilicity. Filtration results also showed that the pure water flux (PWF) of the modified membrane was lower than that of the unirradiated membrane.
聚偏氟乙烯（PVDF）膜在室温下于空气中垂直暴露于高能电子束（EB）。通过傅里叶变换红外光谱（FTIR）检测化学变化。利用扫描电子显微镜（SEM）研究表面形态，结果显示孔径有一些变化。热重分析（TGA）表明辐照使PVDF的热稳定性增加。电子顺磁共振（EPR）显示辐照后的PVDF中存在自由基。分析了EB辐照对膜电性能的影响以确定介电常数，发现随着剂量增加介电常数增大。通过测量水接触角表征改性膜的表面亲水性。与原始角度相比，接触角减小，表明表面亲水性得到改善。过滤结果还表明，改性膜的纯水通量（PWF）低于未辐照膜的纯水通量。
