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.

The rice bran wax was firstly extracted by solvent from rice bran, and triacontanol was thenextracted after refining. The extraction conditions were determined through the investigation of solvent type, extraction temperature, time and other factors. After refining, the optimum conditions for extracting triacontanol were determined, and the corresponding products were characterized by infrared spectroscopy. The experimental results show that the yield of crude rice bran wax is 1.0%~1.5% under the conditions of isobutanol as extractant, isobutanol/rice bran mass fraction ratio of 10, extraction temperature of 105 ℃ and extraction time of 5 h. In addition, the yield of refined rice bran wax is 3.1% under the conditions of saponification temperature 55 ℃, reaction time 8 h, sodium hydroxide concentration 3 mol/L and ethanol calcium chloride as extraction solution. The infrared spectrum analysis indicated that the melting point of the product is 85.0~86.5 ℃.

The structure and reaction path of the doublet \[Si, O, C, P\] radical were explored by density functional theory and ab initio levels. Thirteen isomers connected by 15 interconversion transition states are located at the B3LYP/6-311G(d) level. At the QCISD/6-311G(d) level, one cyclic O-cCSiP5 and two bent isomers OSiCP1 and SiCPO3 are stable isomers. The bonding nature of the three isomers and the reaction path of isomers 1 and 5 were analyzed. The predicted structure and reaction path are expected to be informative for the identification of \[Si, O, C, P\] in the laboratory and space detectation.

The spontaneous combustion of iron sulfides in sour oil tanks is thought to be the main reason to cause fire and explosion accidents in oil tanks. Sulfur hydrogen dissolving in water to form hydro-sulfuric acid reacts with iron to give iron sulfides. The gas of sulfur hydrogen was continuously passed through the water, at a flow rate of 300 mL/min for 6 h, in trigonal beaker contained 8 g iron powder to produce the iron sulfide samples at 25, 50 and 75 ℃ respectively. The deposit was filtered and dried. The reaction product was analyzed by chemical and XRD analysis. The results show the iron sulfide in reaction product is FeS. Air passed through the dry and moist reaction product at a flow rate of 300 mL/min respectively. The experimental results show that all the reaction products are of high spontaneous combustion nature. When sulfuration temperature is increased, the sulfuration reaction rate rose and the spontaneous combustion nature of reaction product are also raised.