| Self-cleaning fabric which has the function of eliminating pollutants can effectivelyshield and remove environmental pollutants such as bacteria, virus, pesticides, and stain,avoiding these pollutants cause harm to human body through the skin, so it has importantresearch value. At present, there are two main ways to obtain the self-cleaning surface: superhydrophobic and photocatalysis. The preparation methods of super hydrophobic surface mostlyrequire complex design, fine control technology or expensive fluorine and silicon compounds.Photocatalytic surface is based on the mechanism of photocatalytic degradation. TiO2photoinduced surface has been widely used at present, but as an inorganic material it has lowaffinity with the fiber surface, leading to its lower fastness. In view of this, this work studied akind of organic polymer system with photocatalytic capability, i.e. SPEEK/PVA (sulfonatedpolyether ether ketone/polyvinyl alcohol), which could form active radicals under UVirradiation to eliminate pollutants. SPEEK/PVA modified cotton fabric was prepared based onthis, its wearability and water resistance was superior, and it had good degradation effectagainst the simulated pollutants of methyl orange and diuron which is a kind of poisonous andharmful materials, and had antimicrobial property against gram-negative bacteria of E.coli andgram-positive bacteria of S.aureus. The research content was divided into three parts as follows.Part one: The preparation of SPEEK/PVA composite polymer solution. SPEEK/PVAcomposite polymer solution was prepared by blending method. It could form polymer activeradicals and form reactive oxygen free radical with O2under UV irradiation. It had gooddegradation effect against the simulated pollutants of methyl orange. The optimal process ofthe SPEEK/PVA composite polymer solution was determined and showed as follows:sulfonated degree of SPEEK was73.3%, SPEEK/PVA ratio was3:1, crosslinking agentcontents was6%, and pH was2.3.Part two: Characterization and performance of SPEEK/PVA membrane. The Polymercomposite membrane was prepared by the method of Blend-pouring. The membrane was characterized by a variety of means of modern instrument analysis, such as TG, FTIR, SEMand EPR. It was found that PVA crosslinked fully within membrane and uniform distributedwith SPEEK. Thermal stability of the membrane was good, and it was also stable to UVirradiation. The membrance could produce active radicals which could be stable in2h or more.When SPEEK/PVA ratio was1:3and SPEEK sulfonated degree was73.3%, SPEEK/PVAmembrane had an optimum performance of mechanical properties and transparency.Part three: Preparation, characterization and performance of SPEEK/PVA modifiedcotton fabric. The SPEEK/PVA modified cotton fabric was prepared by the method of thedipping-baking, it was characterized by a variety of means of modern instrument analysis, suchas FTIR, SEM and EPR. It was found that PVA crosslinking with hydroxyl of the cotton fiber onthe surface of cotton fabric, and intensive mixing with SPEEK to form a homogeneous polymercomposite membrane. It could form active radicals under UV irradiation and endow theSPEEK/PVA modified cotton fabric with the performance of eliminate pollutants. The studyfound that the SPEEK/PVA ratio and dipping time of the cotton fabric had a significantinfluence on the performance of SPEEK/PVA cotton fabric and degradation performance of thesimulated pollutants of methyl orange. The optimal process of the SPEEK/PVA modified cottonfabric was determined and showed as follows: SPEEK/PVA ratio was1:3, and dipping time ofcotton fabric was60min. The degradation performance against methyl orange of SPEEK/PVAmodified cotton fabric was washable, and repeatability of it was good, and it had gooddegradation effect against diuron which is a kind of poisonous and harmful materials, andequipped with antimicrobial property against gram-negative bacteria of E.coli andgram-positive bacteria of S.aureus. The antibacterial rate reached93.33%and87.67%respectively. |
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