To optimize the preparation process for ethylene vinyl acetate (EVA)/rectorite nanocomposites during the melt extrusion, the effect of rectorite on the rheological property of molten polymer has been explored in this paper. The dispersion of rectorite in EVA was probed by X‐ray diffraction, and the rheological behaviors of EVA copolymer and EVA/rectorite nanocomposites during the extrusion process were investigated by means of HAAKE minilab. The positron results reveal that introducing the rectorite in EVA matrix increases the interfaces in composites. And the rheological results indicate that the viscosity of EVA and EVA/rectorite nanocomposites in the molten state was influenced by the processing temperature, processing time and shearing rate. For all the samples, the viscosity increases with increasing the shear rate, and decreases with increasing extrusion temperature. Moreover, compared with the pure EVA, the EVA/rectorite nanocomposite presents a lower viscosity at the same processing condition. Copyright © 2016 John Wiley & Sons, Ltd.

In order to enhance the surface anti-fouling property of separation membrane, TiO2/polysulfone (PSF) membrane was prepared by the phase inversion method, and the surface was treated by oxygen plasma to obtain a composite membrane with photo catalysis activity. To evaluate the effect of oxygen plasma on the surface modification, positron annihilation γ-ray spectroscopy coupled with a positron beam was utilized to probe the surface feature, while the catalysis evaluation system was employed to study the anti-fouling activity of the membrane. The results indicate that with increasing plasma treatment time, the membrane exhibits higher S parameter in the lower energies, while the photo catalysis activity is strengthened. It can be concluded that plasma technique can improve the photo catalysis activity of the composite membrane.