Важным типом среди полимерных мембран являются мембраны на основе флуоросодержащих полимеров, благодаря их физической устойчивости и химической инертности. Мембраны из флуоросодержащих полимеров и сополимеров более стабильны в большинстве химических агентов и сред, по сравнению с мембранами из других видов полимеров. Кроме того, они гидрофобны и устойчивы при повышенных температурах. Поскольку высокая себестоимость флуорополимеров ограничивает использование мембран, их применяют лишь в тех процессах, в которых мембраны из других, менее дорогих материалов не будут удовлетворять требования эксплуатации. За счет высокой гидрофобности, химической и термической устойчивости тефлоновые мембраны используют в микро-, ультрафильтрации и мембранной дистилляции в агрессивных рабочих средах при повышенных температурах. Однако несмачиваемость этих мембран водой несколько ограничивает их применение. Метод инверсии фаз можно использовать только для получения мембран с флуорополимеров, которые хорошо растворяются в органических растворителях (ацетон, ДМФА, ДМАА). Однако полностью перфторированные полимеры, такие как политетрафлуорэтилен (ПТФЭ), не отвечают этим требованиям, поэтому с-F группы в этих полимерах должны быть замещены на С-Н группы лишь частично.
An important type among polymer membranes are membranes based on fluorinated polymers, due to their physical stability and chemical inertia. Membranes made of fluorinated polymers and copolymers are more stable in most chemical agents and media compared to membranes made of other types of polymers. In addition, they are hydrophobic and stable at elevated temperatures. Since the high cost of fluoropolymers limits the use of membranes, they are used only in those processes in which membranes made of other, less expensive materials will not meet the requirements of operation. Due to their high hydrophobicity, chemical and thermal stability, Teflon membranes are used in microfiltration, ultrafiltration and membrane distillation in aggressive working environments at elevated temperatures. However, the water-tightness of these membranes somewhat limits their use. The phase inversion method can only be used to produce membranes with fluoropolymers that are highly soluble in organic solvents (acetone, DMFA, DMAA). However, fully perfluorinated polymers such as polytetrafluoroethylene (PTFE) do not meet these requirements, so the c-F groups in these polymers should only be partially replaced by C-H groups.
An important type among polymer membranes are membranes based on fluorinated polymers, due to their physical stability and chemical inertia. Membranes made of fluorinated polymers and copolymers are more stable in most chemical agents and media compared to membranes made of other types of polymers. In addition, they are hydrophobic and stable at elevated temperatures. Since the high cost of fluoropolymers limits the use of membranes, they are used only in those processes in which membranes made of other, less expensive materials will not meet the requirements of operation. Due to their high hydrophobicity, chemical and thermal stability, Teflon membranes are used in microfiltration, ultrafiltration and membrane distillation in aggressive working environments at elevated temperatures. However, the water-tightness of these membranes somewhat limits their use. The phase inversion method can only be used to produce membranes with fluoropolymers that are highly soluble in organic solvents (acetone, DMFA, DMAA). However, fully perfluorinated polymers such as polytetrafluoroethylene (PTFE) do not meet these requirements, so the c-F groups in these polymers should only be partially replaced by C-H groups.