丙烯酸接枝改性聚偏氟乙烯及其微孔膜制备的研究

摘要：聚偏氟乙烯是一种常用的膜材料，由于PVDF优越的化学稳定性和耐热性，成为了膜科学研究的热点。如今现代化工业生产对分离技术的要求越来越高，使用膜分离技术不仅可以解决工业生产需要还可以有效提高生产效率，并且可以有效地降低生产过程中的污染程度，因此膜分离技术的应用对现代化工业生产有着促进的作用。本文通过对成膜原理以及PVDF膜改性的研究，通过以丙烯酸接枝为介质材料，对聚偏氟乙烯进行接枝改性，已经采用pH值致相转化法制备改性的聚偏氟乙烯（PVDF-g-AAC）微孔膜；通过ATR-FTIR和XPS对PVDF-g-AAC分析，可以得出丙烯酸单体已经在PVDF链上接枝成功；利用SEM和AFM对PVDF膜和PVDF-g-AAC改性膜的表面和断面的形貌特征进行表征；并且测得膜的纯水通量、污染通量、静态和动态接触角，由这些数据对纯PVDF膜和PVDF-g-AAC改性膜的抗污染性能和亲水性加以验证。实验结果表明，改性的PVDF膜的孔径和亲水性与凝胶浴pH值有关，凝胶浴的pH值越大的，改性的PVDF膜的孔径也越大，其亲水性也越好。改性的PVDF膜与纯PVDF膜相比，其水通量增加了约400%，膜的水接触角降低至74.5°，改性膜的蛋白吸附量也从80.1 μg∙cm-2降低到46.7μg∙cm-2，通过对膜进行丙烯酸接枝改性，从而使得膜的抗污染性能有了明显的提高。

关键词：聚偏氟乙烯；丙烯酸；pH值致相转化法

Study on acrylic acid grafting polyvinylidene fluoride and preparation of micro-pore membrane

Abstract：Polyvinylidene fluoride ethylene is a common membrane material, because the superior chemical stability and heat resistance of PVDF has become a hot spot in membrane science research. Today's modern industrial production requires more and more separation technology. Using membrane separation technology can not only solve industrial production needs but also can effectively improve production efficiency, and can effectively reduce the degree of pollution in the production process, so the application of membrane separation technology Modern industrial production has a promoting effect. In this paper, through the study of the principle of film formation and the modification of PVDF film, graft modification of polyvinylidene fluoride was carried out by using acrylic acid grafting as a dielectric material, and a modified phase-to-phase conversion method has been used to prepare modified polyvinylidene fluoride. (PVDF-g-AAC) microporous membrane; PVDF-g-AAC analysis by ATR-FTIR and XPS, it can be concluded that the acrylic monomer has been successfully grafted on the PVDF chain; PVDF membrane and PVDF- using SEM and AFM The morphology of the surface and cross-section of the g-AAC modified membrane was characterized; and the pure water flux, the contamination flux, the static and dynamic contact angles of the membrane were measured, from these data on pure PVDF membrane and PVDF-g-AAC. The modified membrane was tested for its antifouling properties and hydrophilicity. The experimental results show that the pore size and hydrophilicity of the modified PVDF membrane are related to the pH of the gel bath. The larger the pH of the gel bath, the larger the pore size of the modified PVDF membrane and the more hydrophilic it is. it is good. Compared with the pure PVDF membrane, the water flux of the modified PVDF membrane increased by about 400%, the water contact angle of the membrane decreased to 74.5°, and the protein adsorption capacity of the modified membrane also decreased from 80.1μg∙cm-2 to 46.7μg ∙ cm-2, through the acrylic graft modification of the membrane, so that the membrane's anti-pollution performance has been significantly improved.

Keywords: Polyvinylidene fluoride (PVDF); acrylic acid (AAC); pH value-inducedphase-inversion

1 绪论丙烯酸接枝改性聚偏氟乙烯及其微孔膜制备的研究:http://www.chuibin.com/huaxue/lunwen_205526.html