Epoxidized natural rubber (ENR) was synthesized from rubber trees via p ‐toluenesulfonic acid and latex and characterized by different instrumental techniques. In the analysis of the FTIR spectra of ENR, the vibrational signal of the epoxide group at 815 cm −1 was observed. 13 C nuclear magnetic resonance (NMR) spectra confirmed that the signal of the epoxide group was in the range of 57–69 ppm for the synthesized epoxides. The viscoelastic pasting property of starch with ENR is greater with respect to that of starch alone. The starch‐g‐natural rubber (starch‐g‐NR) graft copolymer was obtained in situ during the preparation of the films. FTIR analysis of the films confirmed the presence of C‒O bonds between the cassava starch and NR. The graft copolymer films exhibited a decrease in their degradation temperature according to thermogravimetric analysis (TGA). SEM micrographs of the films revealed the compatibility between NR and starch; their films were homogeneous and uniform. These films have high potential for use in the food industry.
García-Ramón et al. (Thu,) studied this question.