Studies On Application Of Ion Exchange Fiber (IEF) Based On Polytetrafluoroethylene (PTFE) Matrixes

Ion exchange fiber(IEF) is a kind of novel functional material for adsorption and separation. It has many peculiarities such as big effective surface area and short transit distance,and it can be used in the form of fiber, kint goods, unwoven cloth etc. Many new technology processes have been developed from these materials and have been widly used in air purification, environment conservation, bioengineering and hydra-metallurgy.Application of a weakly acid IEF and a strong acid IEF based on Polytetrafluoroethylene (PTFE) were studied in the thesis. Adsorption properties of PTFE weakly acidic on heavy metal and catalysis to esterification were discussed deeply.The adsorption properties of PTFE weakly acidic cation exchange fiber in solution for Pb²⁺ and Cu²⁺ were studied. And the effects of pH value, grafted degree on adsorption were also determined. The results showed that the fiber exhibited fairly good adsorption properties. And the adsorption capacities for Pb²⁺,Cu²⁺ were 505mg/g , 129.2mg/g. Pb²⁺ and Cu²⁺ adsorped on the PTFE fiber Could be also desorbed by 1N HNO₃ and HC1. And this process showed the fiber is easy to desorp and can be used repeatly.The catalysis of PTFE strong acidic cation exchange fiber was studied in esterification. The effects of different amount, different grafted ration, different temperature to the fiber was discussed in the esterification of acetic acid and butyl alcohol, and the kinetics constants and activation energy were gained. The effects of different temperature to the fiber were studied in the reaction of unsaturated acid -crylic acid and normal butyl alcohol, length carbochain acid— stearic acid and lauryl alcohol, and the kinetics constants and activation energy were gained. A further study is carried out between PTFE and ion exchange resin, it could be found, the relative catalytic activity of PTFE-ST-SO3H fiber is higher than that of macroporous sulphonated resin. The results PTFE ion exchange fiber is a better solid catalyzer and easier to regeneration than ion exchange resin.The weak acid ion exchange fiber has good biological activity by chelating withAg+. Antibacterial test was carried out against Escherichia-Coil and The results show that PTFE chelated silver have strong antibacterial activity.