Synthesis and characterization of starch microspheres crosslinked with N,N'-methylene-bis-acrylamide

Crosslinked starch microspheres(CSM) were prepared by crosslinking of soluble starch and N,N'-methylene-bis-acrylamide in inverse suspension using K2S2O8-Na2SO3 as initiator.The influences of contents of crosslinking agent,reaction temperature and initiator concentration on yield,swelling ratio and average diameter of CSM were studied.The samples of CSM were characterized by scan electron microscope,FT-IR spectroscopy,X-ray diffraction(XRD),Differential scanning calorimetry(DSC) and thermogravimetric analysis(TGA).The results show that the crosslinked starch microspheres with acylamino are spherical and even distributing particulates with smooth surface.The crystallinity of CSM decreased and the thermal stability increased in comparison with soluble starch.