Thermal And Vibrational Properties Of Poly(Vinyl Alcohol) Bearing Coumarin

K.M.Abd El-Kader¹*, Y.A.Badr²

¹Suez Canal University, Faculty of Science, Physics Department, Ismailia, (EGYPT)
²Cairo University, National Institute of Laser Enhanced Science (NILES), Cairo, (EGYPT)

PAGE NO: 095-101

ABSTRACT 

A series of PVA- coum films with different concentrations (0, 30, 70, 110, 150 ppm) were prepared by casting technique. Thermal analyzes [differential scanning calorimetry (DSC) and thermo-gravimetric analysis (TGA)] and vibrational spectroscopy (FTIR, FT-Raman techniques) were employed to characterize and reveal the miscibility map and the structural properties of samples. The obtained results of the thermal analyzes showed that glass transition (T_g) decreased with increasing coum content while the melting temperature (Tm), vaporization temperature (T_vap) and weight loss were found to be almost constant. FT-Raman analysis showed that some bands did not show any variation in position and intensity by changing the coumarin concentration such as 852.3, 1096.2, 1145.4, 1441.5, 2910.1 cm^-1 while other bands appeared only with doping for example 1334 cm^-1 in most of concentrations (30, 70, 110 ppm), some bands appear only in one concentration for example 1774.3 cm^-1 at concentration 30ppm, 1801cm^-1 at 70ppm and 1860 at 150ppm.