Investigate Physical Properties and Intensity of Sun Light Transmitted through Safranin/PMMA Films

Abstract

To investigate the effect of safranin additions on the optical properties of PMMA hosts, films of pure and doped polymethylmethacrylate (PMMA) with various volumes of safranin (S) dye solution (6, 12, 18, 24, 30, and 35 ml) were equipped via the solution-casting method at room temperature. For an aim of assessing the kind of transition that was established to be indirect transition, these films were described using the method of UV/VIS. It showed absorption characteristic peak at 530 nm which increased with dye concentration until 24ml after that absorbance will decrease for (30 and 36) ml. The optical energy gap of polymethylmethacrylate (PMMA) was (5.0 eV) and after doping PMMA polymer with safranin dye, the energy gap value of the PMMA films raised as the volume ratio of Safranin solution raised but for volume doping 24ml of safranin solution, the energy gap reduced. The intensity of solar radiation was measured for pure PMMA and safranin /PMMA films, for four consecutive days from 7 A.M. to 5 P.M. (17 hr.), at a rate one hour. It can be concluded that the ratio of the transmitted radiation intensity to the intensity of the sun's radiation for all films is equal for every hour and for all days.

Keywords

• safranin dye
• polymethylmethacrylate
• physical properties
• sun light.