Study of optical properties of (PEO-PEG)‎ blends

Abstract EN

The study it includes the recording of the spectrum of absorbance and transmittance for (PEO) solutions and the blend solution (PEO – PEG) , at the temperature (30 ºC).

and calculating the absorption coefficient and other optical constants.

These samples have been prepared in different weight concentrations (0.1,0.2,0.3,0.4,0.5,0.6,0.7,0.8 g/mL) % as solution for (PEO),then the additives added as (0.25 g ) and ( 0.5 g) of (PEG)respectively, also samples prepared by liquids mixing method before and after adding (PEG) polymer.

Optical properties such as ( absorbance and refractive index ) have been measured, then from those properties other properties were calculated such as (transmittance, reflectance, absorption coefficient of electromagnetic waves, natural lifetime, coefficient of fineness, molar reflectance, critical angle and Brewster angle ).

All those properties have been measured for two cases before and after addition at temperature (30 ºC).

the values of absorbance increase when concentration increase , the refractive index values of pure polymer and its additives are increasing with the increase of the concentrations of these polymer , Noting that the increment of absorption coefficient values under the influence of addition caused by increasing density of the solutions as a result of the increased concentrations, that led to the increase of light absorbed because the interaction of the electromagnetic wave and the large molecules of the polymer increases with concentration, Since the natural lifetime is inversely proportional to the absorption coefficient , so lifetime decreases under the influence of adding (PEG) polymer , The results show that decreasing in the values of transmittance with all concentrations , It’s a clear from Figure below the values of reflectance are increases with increasing concentration before and after the addition , the results showed increase the values of molar reflectance after the addition of (PEG) derivative polymer, This Figures shows that the coefficient of the finesse of basic polymer and its blend has the same behavior to their reflectance, the Brewster angle shown to have the same behavior of refractive index.

the critical angle values of PEO and its polymeric blend decrease with the increase of the concentration.