26 April 2016 Application of laser radiation for investigation of oriented polypropylene membranes
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The oriented microporous polypropylene film membranes have been prepared in the process based on the melt extrusion. Functional characteristics of the membranes (permeability, overall porosity, sizes of pores) were controlled by the parameters of the preparation process. The samples had a well-developed porous structure and contained a through flow channels. The structure of the films was investigated by laser light scattering in dependence on the orientation degree. Light scattering patterns have been obtained using a low-energy He-Ne laser with the power of 5 mW and the wavelength of 633 nm. The optical setup also included the beam-forming system, and the detection unit connected to a PC. To detect the light scattering pattern, a lens less CCD-camera was used. The scattering patterns have a developed speckle structure, and, therefore, to simplify further studies, intensity should be averaged over a sufficiently large number of patterns using a special computer program. These scattering patterns are characterized by a specific type of symmetry and differ from any patterns typical for oriented crystallizable polymers. It is found that similar patterns are observed for all porous samples regardless of their orientation degree. The size of central maximum of the scattering pattern is dependent on the polymer film orientation degree. The results correlate well with the dependence of the porous films overall porosity on orientation degree.
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Alexander A. Zinchik, Alexander A. Zinchik, Ivan S. Kuryndin, Ivan S. Kuryndin, Ksenia V. Ezhova, Ksenia V. Ezhova, Galina K. Elyashevich, Galina K. Elyashevich, } "Application of laser radiation for investigation of oriented polypropylene membranes", Proc. SPIE 9890, Optical Micro- and Nanometrology VI, 989016 (26 April 2016); doi: 10.1117/12.2227776; https://doi.org/10.1117/12.2227776

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