紫外接枝丙烯酸对PVDF膜表面改性的研究

Study on Surface Modification of PVDF Membranes with UV Grafted Acrylic Acid

以二苯甲酮为光引发剂,通过紫外辐照将亲水性单体丙烯酸接枝于聚偏氟乙烯(PVDF)膜的表面。考察了光引发剂浓度和辐照时间对接枝率的影响,并利用衰减全反射光谱和扫描电子显微镜对接枝后PVDF膜表面的化学组成和微观形貌进行了表征。结果表明:随着光引发剂浓度的增大,丙烯酸的接枝率先增大后减小。通过纯水接触角和吸水率研究了接枝后的PVDF膜的亲水性,发现接枝后的PVDF膜的亲水性得到明显改善。

Acrylic acid was grafted onto the surface of PVDF membrane by UV irradiation grafting polymerization with benzophenone as photo-initiator. The principal factors influenced the grating degree were discussed, such as the concentration of photo-initiator, irradiation time. The chemical structure and morphological changes of the original and modified PVDF membrane were characterized by use of attenuated total reflection-Fourier transform infrared spectroscopy and scanning electron microscopy. The results show that： acrylic acid ss successfully grafted onto the surface of PVDF membrane, with the increase of the concentration of photo-initiator, the degree of grafting increases firstly, and then decreases. In addition, the static contact angle and water absorption ratio were used to study the hydrophilic property of modified PVDF membrane, the results show that： the hydrophilic property of PVDF membranes improves significantly.