文摘
An interferometric method was used for investigating the effect of thermal annealing on the linear birefringence and its dispersion of 3 polymers. The annealing temperatures were 80, 60, 40 and 20 °C below the melting point of the used polymers. Two atomic parameters: the resonance wavelength, λo, and the oscillator parameters difference, Δ(NF) for the three polymers were deduced. It’s found that, as the annealing temperature increases, both Δn and Δ (NF) decrease.while λo increases.