Widespread application of PLA is limited because of its slow crystallization rate and low heat deflection temperature. The poly (lactic acid) (PLA) with wood flour (WF) and a small amount of multi amide compound (MA) were successfully prepared by melt blending. The crystallization kinetics, heat resistance and mechanical properties of PLA composites were studied. When the addition of wood flour was 30.0% and multi amide compound was 0.3%, DSC results show that the crystallization rate of isothermal and non⁃isothermal improved dramatically, and correspondingly the Vicatsofting point of PLA composites increases to 146.5 ℃, higher than that of neat PLA 61.6 ℃, the heat resistance of PLA is improved dramatically. Moreover, mechanical properties of the PLA composties are studied. The tensile strength of the PLA/WF and PLA/WF/MA samples is increased slightly. It is concluded that the combination of wood flour and the multi amide compound have a synergistic effect on PLA crystallization behavior to producehigh heat resistance PLA composites.

A mononuclear cobalt complex [Co(H2L)(phen)2(H2O)]·4H2O (H2L2-=4,5⁃dihydroxy⁃1,3⁃disulfonate ion, phen=1,10⁃phenanthroline) was synthesized by hydrothermal method. The composition and structure of the complex were characterized by X ray single crystal diffraction, elemental analysis and thermogravimetric analysis. Single crystal diffraction study shows that the cobalt ion is six⁃coordinated, which can coordinate with the four nitrogen atoms of two phen ligands and the oxygen atoms of water molecule and sulfonate group, forming the twisted octahedral configuration in the complex. Compared with the ligand, the fluorescence emission peak of the complex has a blue shift, and the maximum emission peak is at 380 nm.