Nonwoven Calendered Copoly(Urethane-Imide) Materials for Ultrafiltration of Solutions Containing Aggressive Amide Solvents

Copoly(urethane imides) were synthesized based on dianhydrides of aromatic tetracarboxylic acids (pyromellite acid, diphenyloxide tetracarboxylic acid), diaminodiphenyl ether, toluene diisocyanate and polycaprolactone. The resulting copolymers are thermoplastics in their mechanical properties. Prepolymers of copolymers were electrodeposited from their solutions in amide solvents. As a result, polymer mats with a structure of interwoven cylindrical microfibers were obtained. Using the method of high-temperature calendering, the structural compaction of the mats was carried out and their deformation-strength properties and porosity were determined. Based on the results of an analysis of the properties of the obtained calendered mats, a conclusion was made about the prospects of their use in creating membranes for ultrafiltration of acidic aqueous solutions and solutions of amide solvents used in pharmaceutics.