Structure and Properties of Starch/Polybutylene Succinate Blends Modified by Magnesium Chloride/1-Butyl-3-methylimidazolium Chloride

The starch/poly(butylene succinate) (PBS) blends were modified by magnesium chloride/1-butyl-3-methylimidazolium chloride ([BMIM] Cl) compound plasticizing agent. The structure and performance of magnesium chloride/[BMIM] Cl modified stareh/PBS blends were studied by Fourier transform infrared spectroscopy(FTIR) , scanning electron microscopy(SEM) , differential scanning calorimetry(DSC) analysis, X-ray diffraction(XRD) and mechanical properties test. The research results showed that magnesium chloride could form strong interaction with starch and PBS to destroy the original hydrogen bond, which leaded to the structure and properties of stareh/PBS blends change. Compared with the [BMIM] Cl modified system, the magnesium chloride/[BMIM] Cl modified system could further enhance the interfacial adhesion of starch to PBS and improve the compatibility of the blends. The melting enthalpy, crystallinity and the crystallization temperature of stareh/PBS were decreased, and the cold crystallization temperature were increased. The mechanical strength and elongation at break of the blends were improved and the strength reduction due to high efficiency plasticization of [BMIM] Cl was inhibited. The stareh/PBS blends with good mechanical properties could be prepared by magnesium chloride/[BMIM] Cl modified system.