Super-selective polysulfone hollow fibre membranes for gas separation: Assessment of molecular orientation by Raman spectroscopy

It has been shown that the polarized Raman scattering method previously dev eloped For quantitative analysis of molecular orientation in polyethylene c an be applied to polysulfone hollow fibre membranes. The orientation parame ters for the in-plane vibration of the benzene ring in the active layers of the membranes were determined for different processing conditions of the f ibres. The results reported here confirm the fact, revealed previously by I R spectroscopy, that the spinning of membrane fibres at high shear rates ma y induce anisotropy at the molecular level in the active layer.