The azido starch/ Natural Rubber (azo-starch/NR) latex films were prepared with control (0), 0.5, 1.0, 1.5 and 2.0 phr of azido- starch loadings. The azido starch functional groups were characterized by Fourier Transform Infra- Red (FTIR) analysis to observe the presence of significant peaks of azide (N3].The control and azido starch-filled NR films were subjected to tensile test and tear test in order to investigate the effect of the addition of azido- starch on the mechanical properties of azo-starch/NR latex films. The tensile strength of azo-starch/NR latex films was increased with increasing azido-starch loading and slightly decreased after 1.0 phr loading. The optimum tensile strength of azo-starch/NR latex films is obtained at 1.0 phr loading. The moduli (M100 and M300] and tear strength also increased with increasing azido- starch loading. However, the elongation at break (EB] was almost similar with increasing azido- starch loading. The swelling test was done to determine the swelling index, crosslink density and rubber-filler interaction of azo-starch/NR films. The swelling index was decreased but the crosslink density increased with increasing azido-starch loading indicating the formation of crosslinks between azido- starch and rubber macromolecules.
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