The encapsulation method is used in the textile detergents and softeners industry to provide a long-lasting fragrance. Capsules currently employed show low encapsulation capacity and stability. However, polysulfone (PSI) microcapsules were proposed, as they show promising results. To characterize PSf capsule morphological and mechanical properties, flat sheet PSf/vanillin membranes have been prepared simulating capsules obtainment procedure. Two treatments were performed: immersing PSf/vanillin membranes in (a) 6000 ppm DMF aqueous solution or in (b) Milli-Qwater, at different temperatures (55-90 degrees C). Membrane samples where analyzed by SEM, IFME software, and the test methods of the ASTM (puncture resistance and tensile methods). Morphological analysis showed that temperatures above 55 degrees C and DMF aqueous solution caused an increment of the pore number and size of the PSf/vanillin films porous layer. No structural changes were detected in the dense layer. After material treatment, only the maximum strain % of PSf/vanillin films was modified.