Dielectric relaxation and Schottky conduction of IR laser irradiated Makrofol-DE polycarbonate

The effect of IR laser pulses on the dielectric properties, X-ray diffraction, Fourier transform infrared spectroscopy (FTIR), and IV characteristics of Makrofol-DE 1-1 CC polycarbonate has been investigated in the temperature and frequency ranges of 300-375K and 10 kHz-4 MHz, respectively. IR laser fluencies are set from 0.47 to 7.07 J/cm(2). Three relaxation processes namely, alpha, beta, and gamma have been obtained. The first process is due to the micro Brownian motion of the segmental parts of the main chain. The second process was assigned to the local motion of the dipoles within the crystalline phases of the sample. The third one was attributed to the crank shaft motion along the main chains of the Makrofol. X-ray diffraction and FTIR spectroscopy have revealed that the irradiation of Makrofol at the fluence range 0.94-7.07 J/cm(2) causes crosslinking formation inside the sample. Reduction in crystallinity of Makrofol at higher IR laser doses is due to the crosslinking formation taking place within polymer matrix. At higher voltage, the conduction mechanism of Makrofol-DE was identified as Shottky type. The attained results suggested strongly the applicability of Makrofol-DE in IR laser pulses dosimetry. (C) 2011 Wiley Periodicals, Inc. J Appl Polym Sci 124: 1-8, 2012