| Summary: | 碩士 === 國立高雄應用科技大學 === 化學工程與材料工程系碩士在職專班 === 103 === The main purpose of this study attempted to prepare composites with properties of both antistatic and transparency, by blending methyl methacrylate- acrylonitrile-Butadiene-styrene (MABS) copolymer used as the base resin with antistatic agent and a second transparent resin PMMA (poly- (methyl methacrylate)), and then to evaluate their feasibility of application for antistatic packaging materials used in electronics/ semiconductor industry.
Experimentally, MABS and PEbA (poly(ether-bl-amide)) were mixed and thermal-mechanically blended into polyblend in a twin-screw extruder. By further compositing MABS with PEbA and PMMA together in the same extruder, composites having different composition were prepared under different screw configurations. For evaluating properties of these composites, a variety of measurements, including visual method, ultraviolet- visible spectroscopy (UV-Vis), thermal-ageing test, long-term UV light irradiation method, color reader, thermogravity analyzer (TGA), differential scanning calorimeter (DSC), conductivity measuring instruments, and x-ray diffraction (XRD), were used to observe the transparency, yellowing degree, surface conductivity and its stability with heat, thermal properties, and dispersity of the mixed materials.
The experimental result shows that the incorporating of PEbA into the base resin MABS increases the antistatic ability of the polyblend and it would not migrate to the surface after the polyblend has been baked for a long period of time at elevated temperature, while the transparency of these polyblends degrades seriously. The composite of MABS/PEbA/PMMA, prepared by successively mixing the PMMA into the polyblend, increases the light transmittance, and has a total transmittance up to 83% when PMMA load is about 30 phr. At the same time, the tensile strength and flexural strength of these composites increase but the impact-resistance strength and elongation decrease after adding PMMA. And the transmittance can be further increased up to 87% if a high dispersion configuration mode of the twin-screw extruder is used for the composite dispersion. However, the highly mixed composite shows slightly degraded and little yellowing. Accordingly, a permanently antistatic and high transparency polyblend composite based on MABS resin can be achieved by adding polymeric anti-static agent and transparent PMMA, as well as adequately adjusting the screw configuration of the extruder.
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