PES膜表面纳微结构构筑及抗污染作用研究

发布时间：2018-06-12 05:55

本文选题：PAN/Si + O_2聚合物　；参考：《哈尔滨工业大学》2015年硕士论文

【摘要】：PES膜由于其材料由稳定的刚性苯环结构组成,具有良好的化学稳定性和耐压性等优点,能够应用于多种条件下的污水处理。但在使用的过程中发现,由于PES膜材料为疏水性材料,其在处理污水时水通量较低且容易污染,故本文从纳微结构表面能够有效的抗污染原理出发,调节制备工艺参数制备出两亲性的PAN/Si O2聚合物,用其作为改性剂改性PES膜,进一步调整膜成型工艺,制备出改性PES膜,使其具有规整的纳微结构表面,从而增加水通量和抗污染性。采用添加反应和原位同步水解两种不同的方法均能够制备两亲性PAN/Si O2聚合物,采用添加反应制备的聚合物粒径分布较窄,但存在一定的团聚现象,而同步水解法制备的聚合物粒径分布较宽,但分散相对均匀。研究结果表明,添加法和同步水解法两种方法制备出的两亲性聚合物对PES膜进行改性后,均能够在PES膜表面形成纳微结构,同时改性膜表面具有良好的亲水性和抗污染性能。其中,聚合物添加量,聚合物粒径和聚合物的亲水性对于改性PES膜的表面结构和抗污染性能均有一定的影响。与未改性的PES膜相比,添加反应制备聚合物改性制备的PES膜亲水角为43.31°,降低了28.73%,水通量为547.51L/m2·h,提高了50.43%,水通量恢复率为76.07%,提高了265.19%。原位同步水解的方法制备出的聚合物改性的PES膜,亲水角为42.03°,降低了30.84%,水通量为605.62 L/m2·h,提高了66.39%,水通量恢复率为78.69%,提高了277.72%。综合比较,原位同步水解的方法制备出的两亲性聚合物可以更好的在PES膜表面构筑均匀分布的亲水性纳微结构,其抗污染性更好,具有更优异的综合性能。
[Abstract]:Because PES membrane is composed of stable rigid benzene ring structure, it has good chemical stability and pressure resistance, so it can be used in sewage treatment under various conditions. However, it is found that PES membrane material is hydrophobic, and its water flux is low and easy to pollute in the treatment of sewage. Therefore, the anti-pollution principle of nanostructure surface is considered in this paper. The amphiphilic PAN / Sio _ 2 polymer was prepared by adjusting the preparation process parameters. PES film was modified with PAN / Sio _ 2 as modifier. The modified PES film was prepared by further adjusting the forming process to make the modified PES film have regular nano-structure surface. Thus increasing water flux and pollution resistance. The amphiphilic PAN / Sio _ 2 polymer can be prepared by two different methods of addition reaction and in-situ simultaneous hydrolysis. The particle size distribution of the polymer prepared by adding reaction is narrow, but there exists a certain agglomeration phenomenon. The particle size distribution of the polymer prepared by simultaneous hydrolysis method is wider, but the dispersion is relatively uniform. The results show that the modified PES membrane can form nanostructure on the surface of PES membrane, and the surface of PES membrane has good hydrophilicity and antifouling property after modification of PES membrane by two kinds of amphiphilic polymers prepared by addition method and simultaneous hydrolysis method. The amount of polymer, the diameter of polymer and the hydrophilicity of polymer have some effects on the surface structure and antifouling performance of PES film. Compared with the unmodified PES membrane, the hydrophilic angle of the PES membrane was 43.31 掳, the water flux was 547.51 L / m ~ 2 路h ~ (2), the water flux was 547.51 L / m ~ (2) ~ 2, the water flux recovery rate was 76.07 and 265.19% higher than that of the unmodified PES membrane. The polymer modified PES membrane prepared by in-situ simultaneous hydrolysis has a hydrophilic angle of 42.03 掳, a decrease of 30.844 掳, a water flux of 605.62 L / m ~ 2 路h, an increase of 66.39 and a water flux recovery rate of 78.69 and a 277.72% increase. Compared with the in-situ simultaneous hydrolysis, the amphiphilic polymers prepared by in-situ hydrolysis method can better construct homogeneously distributed hydrophilic nanostructures on the surface of PES membranes, and have better antifouling properties and better comprehensive properties.
【学位授予单位】：哈尔滨工业大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TQ028.8;X703

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