X-Ray diffraction study of polyethersulfone polymer, flat-sheet and hollow fibers prepared from the same under different gas-gaps

• Published in: Desalination 2009-09, Vol.245 (1), p.494-500
• Main Authors: Khayet, M., García-Payo, M.C.
• Format: Article
• Language: English
• Subjects: Applied sciences; Argon; Chemical engineering; Crystallization, leaching, miscellaneous separations; Diffraction; Diffraction patterns; Drying; Exact sciences and technology; Fibers; Gas-gap; Hollow fiber; Organic polymers; Physicochemistry of polymers; Pollution; Polyethersulfone membranes; Properties and characterization; Solution and gel properties; Spinning; Spinning technique; Wet spinning; X-ray diffraction; X-rays
• ISSN: 0011-9164; 1873-4464
• DOI: 10.1016/j.desal.2009.02.013

Polyethersulfone (PES) hollow fiber membranes were prepared by both wet spinning technique, without gas-gap, and dry/wet spinning technique under different gas-gaps, namely, air, oxygen, nitrogen, carbon dioxide, argon and humid air. All spinning parameters were maintained the same except the type of the gas-gap used. Flat-sheets were prepared by the phase-inversion method using the same polymer solution and water as coagulant. The X-ray diffraction pattern of virgin PES indicated that this polymer is mainly amorphous in nature and X-ray diffraction study revealed quite similar structure for flat-sheets and hollow fibers prepared from the PES polymer. It was observed that the PES hollow fibers prepared with dry/wet spinning technique exhibited some differences in X-ray diffraction spectra showing attenuation of the broad band peak intensity for the hollow fibers prepared under argon and carbon dioxide. The intersegmental distance of polymer chains, d-space, was determined. A value of about 4.77 ± 0.05 Å was obtained. The results provide evidence that the spinning technique do not induce crystallization of hollow fibers.