Papers by Author: Ye Han

Abstract: Acrylonitrile-styrene-acrylate copolymer/polycarbonate (ASA/PC) blends were prepared over a range of compositions via mixing PC, SAN, and ASA copolymer by melt blending. An analysis was made on the mechanical properties and morphology of the blends. When a small amount SAN was introduced to ASA/PC blends, the dispersion condition of ASA in the matrix was improved and a better integrated mechanical properties was realized. Further increasing the SAN content led to a decrease of impact strength, which was due to the changing of the morphology of the blends and the inherent brittleness of matrix. Introduction

Abstract: A new glass-ceramic coating material on nickel based super alloy substrate had been found, the glass¬-ceramic coating material was developed from a glass based on MgO–Al2O3–TiO2 system. The coating material was characterized through X-ray diffractometry (XRD), scanning electron microscopy (SEM), differential scanning calorimetry (DSC), hardness, thermal expansion coefficient testing. XRD analysis of the coating materials and the resultant coatings showed presence of a number of microcrystalline phases. SEM micrographs indicated microstructure of the material. Optical micrographs showed smooth glossy impervious free surface with defects. Hardness analysis showed the glass-ceramic coating material had higher microhardness. The thermal expansion coefficient of the nimonic alloy was much higher compared to the coating material at specific temperature.

Abstract: Silicone-modified butyl acrylate-methyl methacrylate copolymer latex was prepared via semi-continuous emulsion polymerization. Octamethyl cyclotetrasiloxane (D4) was used to link acrylate and potassium persulfate was used as initiator (KPS). Effect of D4 content on polymerization of acrylate and properties of latex film were discussed in details. The results showed that the properties of acrylate could be improved by the introduction of D4. Dynamic mechanical analysis showed that the freeze resistance of copolymer was effectively improved. In addition, effect of D4 content on adhesive strength of copolymer was also investigated.

Abstract: Silicone-modified butyl acrylate-methyl methacrylate copolymer latex was prepared via semi-continuous emulsion polymerization with different coupling agents. Effect of coupling agent content on polymerization of acrylate and properties of latex film were discussed in details. It is found that the monomer conversion and degree of crosslinking increased gradually for both Z-6300 and Z-6040 as coupling agent with increasing coupling agent feed concentration. Shear strength and tensile strength decreased with increasing Z-6300 content. While for Z-6040 as the coupling agent, the tensile strength increased with Z-6040 content and the shear strength was in the range of 0～0.6wt%. Dynamic mechanical analysis showed that the freeze resistance of copolymer was effectively improved.