Study of the effect of lithium chloride on polymer solubility by optical microscopy and photon-correlative spectroscopy

Abstract

George Bibileishvili, Liana Ebanoidze

Engineering Institute of Membrane Technology of Georgian Technical University, 0159, Tbilisi, Georgia

*Coressponding author: E-mail: l.ebanoidze@gtu.ge, phone: +955-555374772

Abstract: In the work the research of the process of drying of the polymer and low-molecular electrolytic additive – lithium chloride for obtaining of membrane film on the basis of Poly [N, N′–(1.3-phenylene) isophthalamide] is considered. The study of the process of solving of polymeric composition was carried out in N, N′-dimethilformamide at various temperatures by the investigation of the effect of dried lithium chloride and polymer on solubility degree for polymeric composition. Monitoring of solubility degree for polymeric composition was carried out by the methods of optical microscopy and photon-correlative microscopy.

In response to the research it was revealed that in the polymeric composition, obtained by the components dried to 105⁰C, after monitoring by optical polarization – interference microscope and analyses for determining of the nanoparticles, the particles with the size more than 10000nm in polymeric mass are observed. Along with it, the particles of 10nm-30nm size were found in polymeric mass after monitoring by the analyses for determination of nanoparticles and by optical polarization – interference microscope. Qualitative decomposition of the particles in polymeric composition allows the regulation of the surface, required for formation of membrane pores and the prediction of specific productivity of membrane film.

As a result of the research in has been established that, at the temperatures in the range from 105⁰C to 135⁰C, the components of dried polymer and lithium chloride determine an obtaining of the particles of multiply different size in polymeric mass by maximum value of solving – 10nm.

Monitoring of the particles in solving process was carried out at polarization – interference optical microscope and the sizes of polymer particles and were established at the analyses for determination of the nanoparticles.