Synthesis and characterization of grafted polymer of MMA/BA onto starch

The solid phase graft copolymerization of methyl methacrylate and butyl acrylate onto corn starch was carried out by using ammonium persulfate as initiator.Fourier transform infrared spectroscopy,differential scanning calorimetry,X-ray diffraction,scanning electron microscope,gel permeation chromatography were used to characterize the structure of the raw material and the product.Results showed that graft copolymerization not only destroyed the crystal structure of starch,but also induced a morphological transition.The grafted side chains of SGMBA were mainly copolymerized by 1 350~2 350 monomer units.The molecular weight of the grafted side chains was approximately between 20~36 ten thousand.