教授
硕士生导师
教师拼音名称:wangzhaobo
学位:工学博士
职称:教授
学科:材料物理与化学
材料学材料加工工程材料科学与工程其他专业邮箱:
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关键字:Copolymers;Atomic force microscopy - Dispersions - Nanostructured materials - Polystyrenes - Rheology - Transmission electron microscopy - Ultraviolet radiation;Ethylene-vinyl acetate copolymers - High-impact polystyrene (HIPS) - Rosand Precision rheometer
摘要:TiO<inf>2</inf> nanoparticles were introduced into high-impact polystyrene (HIPS) in the form of a master batch in which TiO<inf>2</inf> was predispersed in composites of HIPS and ethylene-vinyl acetate copolymer (EVA) by melt compounding. The resulting materials were analyzed with a Rosand Precision rheometer, transmission electron microscopy, atomic force microscopy, and ultraviolet-visible light spectrophotometry. The results showed that the introduction of TiO<inf>2</inf> nanoparticles into HIPS influenced the apparent viscosity of the composites to a rather small extent. The addition of EVA could regulate the rheological behavior of the HIPS/TiO<inf>2</inf> master batch greatly. EVA helped the dispersions of the agglomerates of TiO<inf>2</inf> nanoparticles in the flow; this was featured by the distinct yielding in the flow after the introduction of EVA, as well as the large change in the non-Newtonian indices. The dispersions of the HIPS/TiO<inf>2</inf> master batch in the HIPS matrix were improved greatly by the addition of EVA. TiO<inf>2</inf> nanoparticles were dispersed randomly in HIPS/EVA/TiO<inf>2</inf> nanocomposites. The dispersion improvement of the HIPS/EVA/TiO<inf>2</inf> master batch was also proved by atomic force microscopy and ultravioletvisible spectroscopy investigations. The mechanical properties of HIPS/EVA/TiO <inf>2</inf> nanocomposites with low TiO<inf>2</inf> contents were slightly higher than those of pure HIPS. © 2006 Wiley Periodicals, Inc.
卷号:100
期号:6
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