On physics of optical laser light scattering (OLLS) of an industrial polymer which may assist in physics of random laser (RL) investigation

Abstract

In present work a polyvinyl pyrrolidone (PVP) polymer was selected to study the phenomena of optical laser light scattering (OLLS PVP was investigated for its importance in the daily industrial applications which are important for different branches. This polymer was solved in different solvents like as Methanol, Chloroform and Dimethylformamide, DMF, with different concentrations 1, 2, 3, 4, 5, 6 × 10 -3 g/ml. The refractive index increments (dn/dc) of that polymer solution were determined with the aid of an constructed laser interferometer system. The obtained values of dn/dc were used in the laser scattering investigation. OLLS data were obtained by using a self-built of laser scattering system. The angular behavior of that selected polymer solution with different concentrations were studied by plotting the intensity of the scattered light against the scattering angle. The value of kc/R(θ) ratio was plotted as a function of 8 through the value sin 2(θ/2)+100 C, showing what was called Zimm plot. From that plot the different scattering parameters such as Pap's molecular weight M w, Second virial coefficient A 2, Radius of gyration R G and molecular radius D of that polymer were determined in that three different selected solvents. These obtained values of scattering parameters can be used to investigate the random laser (RL) phenomena in addition to the industrial and Pharmaceutical applications of PVP.