首先利用再生纤维素膜表面的羟基与2-溴异丁基溴进行反应,引入原子转移自由基聚合(ATRP)所需的大分子引发剂,然后在膜表面可控接枝具有pH敏感性的聚丙烯酸.通过X光电子能谱仪(XPS)、红外光谱测试(FT-IR),扫描电子显微镜(SEM)表征了膜的表面结构与形貌,证明已成功接枝上丙烯酸.采用膜通量测试研究了接枝膜对pH值的敏感性.实验结果证明,膜表面的接枝聚合具有一定可控性,同时pH敏感性的功能化可通过原子转移自由基聚合(ATRP)来设计.
Regenerated cellulose fibers, in the form of a conventional filter paper,have been modified by reacting the hydroxyl groups on the fiber surface with 2-bromoisobutyryl bromide, followed by grafting with poly(acrylic acid) (PAA) using atom transfer radical polymerization (ATRP) conditions, which has pH modulated permeability properties. The papers were analyzed by X-ray photoelectron spectroscopy (XPS), Fourier transform infrared attenuated total reflection spectrometer (FT-IR), and scanning electron microscopy (SEM). The results show that acrylic acid had been grafted on the surface of the regenerated cellulose membranes successfully. Then the pH modulated permeability properties of the membranes were researched by water flux measurement. This goes to show that the pH modulated permeability properties of a cellulose surface can be tailored by the use of "living" /controlled radical polymerization method ATRP.
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