2026-06-29T07:25:03Zhttps://docta.ucm.es/rest/oai/request

oai:docta.ucm.es:20.500.14352/443132024-09-02T15:48:03Zcom_20.500.14352_14col_20.500.14352_15

X-Ray diffraction study of polyethersulfone polymer, flat-sheet and hollow fibers prepared from the same under different gas-gaps Khayet Souhaimi, Mohamed García Payo, M. Carmen 536 Induced phase-separation Morphology Membranes Performance Termodinámica 2213 Termodinámica Engineering with Membranes Conference (2008. Vale do Lobo, Algarve, Portugal). © 2009 Elsevier B.V. The authors gratefully thank the financial support of Spanish Ministry of Science and Education (MEC) (Project No. FIS2006-05323). The authors also express their gratitude to Dr. J. Velázquez Cano (X-Ray Diffraction Centre, UCM) for taking the X-ray diffraction spectra. 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 angstrom was obtained. The results provide evidence that the spinning technique do not induce crystallization of hollow fibers. Spanish Ministry of Science and Education (MEC) Depto. de Estructura de la Materia, Física Térmica y Electrónica Fac. de Ciencias Físicas TRUE pub 2023-06-20T03:43:11Z 2023-06-20T03:43:11Z 2009-09-15 journal article https://hdl.handle.net/20.500.14352/44313 0011-9164 10.1016/j.desal.2009.02.013 eng FIS2006-05323 restricted access application/pdf Elsevier Science Bv