Dynamic mechanical analysis was performed using a Perkin Elmer DMA 8000 in the temperature/time scan
mode. The shape of test sample was rectangular, 25 mm. long, 10 mm. and 3 mm. thick. The dual cantilever mode
of deformation was used under the test temperature range from -110 to +100oC with a heating rate of 5oC min-1 and
a frequency of 1 Hz. A sinusoidal strain with a frequency of 1 Hz and amplitude of 50 mm was applied to each
specimen. The storage and loss moduli, tan