By Using polymethyl methacrylate （PMMA） as the high-molecular polymer substrate and SiO2 as the filler，a kind of composite fiber with daytime radiative cooling function was prepared via electrospinning.Then，the XRD，SEM，TEM，UV-Vis-NIR and FT-IR were used to characterize the morphology，structure and optical properties of the composite fiber.The results show that the diameter of the electrospun composite fiber is about 800nm in diameter.The forbidden band width of pure PMMA fiber is 4.95eV，which makes the fiber do not absorb visible light; and the orientation crystallization in the electrospinning process leads to crystalline region and amorphous region in the fiber，which does not transmit visible light and displays white，thus obtaining a 200~2500nm short-wavelength reflectivity as high as 97.57%.After the electrospinning，nano-SiO2 powder particles with appropriate amount are dispersed in the composite fiber，which can greatly improve the emissivity.When the doping amount of SiO2 is 7.5%，the reflectivity of the composite fiber in the solar short-wavelength band of 200~2500nm and the emissivity of the 8~13μm atmospheric window are respectively up to 96.53% and 0.903.By using a self-made device to test the cooling effect in the actual environment，it is found that the composite fiber behaves good cooling effect，the temperature of the back of the composite fiber in the daytime is lower than the ambient temperature by 2~4℃.The proposed preparation method of composite fiber with inorganic powder and organic matrix provides a new solution to the practical application of radiative cooling.

A method for the preparation of anatase glass-ceramic glaze at the cooling stage was developed in this paper.The crystallization process of this glaze was analyzed by means of TG-DSC and XRD，and the crystallization kinetics was also studied.Experimental results show that the frit precipitates at the beginning of the heating stage，then melts at high temperature，and precipitates again at the cooling and soaking stages.The type and quantity of crystals precipitated in glaze are related to the thermal schedule at the cooling and soaking stages.Soaking at 700℃ is helpful to obtain crystalline glaze with more anatase phase.The crystallization activation energy of anatase calculated by Kissinger equation is 131.8kJ/mol and the Avrami index is 1.74.The crystallization of anatase occurs with a 3-dimension growth mode.The Vickers hardness of the glaze is 6.33GPa，which is comparable to that of traditional ceramic glazes.The glaze also shows good cleanability.In addition，the chemical composition greatly influences the properties of the glaze.The increase of TiO2 content improves the amount of crystallization of anatase，while the addition of Al2O3 adjusts the sintering temperature of the glaze，which makes it adaptable to the firing schedules of different types of ceramic.

Conductive polymer composites （CPCs） with positive temperature coefficient （PTC） have many applications in self-regulating heating fields.However，current researches on CPCs are mainly concentrated in the high temperature region，and few reports are concerned on low temperature segment.This study proposed a method of making a low Curie temperature point PTC material with water-based acrylic resin as matrix，and discussed the effects of temperature-controlled materials and different proportions of conductive fillers on Curie temperature.By adding Ni powder into the copolymer of water-borne acrylic resin and organic acid crystal，the PTC materials with low initial resistance and a Curie temperature point near the melting point of organic acid crystal were obtained.The Curie temperature point of the material can be adjusted within a certain range by regulating the proportion of Ni powder.Results show that，when the mass fraction of Ni powder is 30%，the initial resistivity of the material can reach 1.96Ω·cm，and the PTC intensity can exceed 6.Heating test results show that the heating capacity and electrical properties of the materials have no significant change after the thermal cycle，indicating good repeatability.

Fe-Cr-B alloy has excellent corrosion resistance to molten aluminum，but its toughness is poor.In order to improve the toughness of Fe-Cr-B alloy，the influence of Ce addition （0~0.92%，mass fraction） on the microstructure，mechanical properties and corrosion resistance of Fe-Cr-B alloy in molten aluminum at 750℃ was investigated.The results show that the addition of Ce changes the boride structure in Fe-Cr-B alloy from a continuous network，dendritic and long rod-like structure to a short rod-like and block structure with less interconnection.With the Ce content increases，the alloy's impact toughness gradually increases，and the corrosion resistance to molten aluminum increases first and then decreases.The uniformly distributed short rod-like boride can improve the alloy's impact toughness while maintaining excellent corrosion resistance to molten aluminum.The Fe-Cr-B alloy with 0.59% Ce has the best comprehensive properties，its impact toughness is 187.97% higher than that of Ce-free，and its corrosion resistance to molten aluminum reaches 5.9 times that of typical die steel H13.