Figures 2b-2d show the effect of the annealing temperature. Comparison of Figs 2a and 2b show that annealing at 100°C for 5 h (Fig. 2b) had little effect on the glass transition and melting behavior of the Nylon-6 matrix; this is consistent with the DSC results (Figs 1a and 1b). When the annealing temperature increased to 180°C (Fig. 2c), the peak due to molecular movement above Ts disappeared. This is attributed to the increase of the degree of crystallinity due to annealing. Because the crystalline portion has constraint on the molecule mobility, the higher the degree of crystallinity, the less is the possibility of molecular movement above T1.