Composite PTFE-polyvinyl alcohol

The use of polytetrafluoroethylene (PTFE)-carboxymethyl cellulose (CMC) com-posits as the binder improves the capacity and sulfur utilization compared with polyvinylpyrrolidone (PVP) and composite PTFE-polyvinyl alcohol (PVA) binders [111], but no cycling performance has been reported. In another paper, capacity... 

J. Xu et al. [283] have shown that immobilization of enzymes can be done using a specially designed composite membrane with a porous hydrophobic layer and a hydrophilic ultrafiltration layer. A polytetrafluoroethylene (PTFE) membrane with micrometer pores as an excellent hydrophobic support for immobilization was employed for the porous hydrophobic layer, and a biocompatible material of polyvinyl alcohol (PVA) which provided a favourable environment to retain the lipase activity was used to prepare the hydrophilic... 

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