This study reports the preparation of waterproof/breathable films based on amidoxime functionalized PIM-1, which were processed into fibrous membrane using the electrospinning process with a green solvent, i.e. dimethyl sulfoxide. The influence of the feed solution (polymer concentration, solvent nature, presence of salt) and the electrospinning process conditions (flow rate, distance between the tip and the collector and voltage) has been investigated in order to obtain bead-free, thin fibres with regular structure and low porosity. The addition of salt allowed the production of nanofibres at low polymer concentration, resulting in the fabrication of fibrous mats with 1.5 micron diameter fibres and porosity below 10 micron. These fibre mats possess a hydrophobic character with a contact angle superior to 90°. Moreover, they are breathable, but not permeable to liquid water, which is essential for use within protective gear (i.e. gas masks or protective clothing).
- Green solvent