Synthesis and characterization of native and modified bitter yam starch grafted with acrylonitrile

This analysis studied the effects modification on properties of starch-based polymer grafted with acrylonitrile (copolymers). Starch was extracted from bitter yam. The starch modified by heating solution above 70 °C and then esterified phthalic anhydride to produce a pregelatinized phthalated derivative. Acrylonitrile onto natural at 120 using calcium oxide snail shell as initiator. grafting reaction poly(acrylonitrile) phthalation were both confirmed Fourier transform infrared (FTIR). Scanning electron microscopy revealed changes in morphology copolymers. X-ray diffractogram showed that native copolymer displayed broad diffraction peaks (amorphous), but yam had prominent (crystalline). Thermogravimetry has better thermal stability than copolymer.