Khaled S M, Sui Ruohong, Charpentier Paul A, Rizkalla Amin S
Department of Chemical and Biochemical Engineering, Faculty of Engineering, University of Western Ontario, London, Ontario, Canada N6A 5B9.
Langmuir. 2007 Mar 27;23(7):3988-95. doi: 10.1021/la062879n. Epub 2007 Feb 23.
Inorganic-polymer nanocomposites are of significant interest for emerging materials due to their improved properties and unique combination of properties. Methacrylic acid (MA), a functionalization agent that can chemically link TiO2 nanomaterials (n-TiO2) and polymer matrix, was used to modify the surface of n-TiO2 using a Ti-carboxylic coordination bond. Then, the double bond in MA was copolymerized with methyl methacrylate (MMA) to form a n-TiO2-PMMA nanocomposite. The resulting n-TiO2-PMMA nanocomposite materials were characterized by using thermal analysis, electron microscopy, and elemental analysis. The dynamic mechanical properties (Young's and shear modulus) were measured using an ultrasonic pulse technique. The electron microscopy results showed a good distribution of the nanofillers in the polymer matrix. The glass transition temperature, thermal degradation temperature, and dynamic elastic moduli of the nanocomposites were shown to increase with an increase in the weight percentage of nanofibers in the composite. The resulting nanocomposites exhibited improved elastic properties and have potential application in dental composites and bone cements.
无机聚合物纳米复合材料因其性能的改善和独特的性能组合而成为新兴材料领域的研究热点。甲基丙烯酸（MA）作为一种能使二氧化钛纳米材料（n-TiO₂）与聚合物基体发生化学连接的官能化剂，通过钛-羧基配位键用于修饰n-TiO₂的表面。然后，MA中的双键与甲基丙烯酸甲酯（MMA）发生共聚反应，形成n-TiO₂-PMMA纳米复合材料。通过热分析、电子显微镜和元素分析对所得的n-TiO₂-PMMA纳米复合材料进行了表征。使用超声脉冲技术测量了动态力学性能（杨氏模量和剪切模量）。电子显微镜结果表明纳米填料在聚合物基体中分布良好。纳米复合材料的玻璃化转变温度、热降解温度和动态弹性模量均随复合材料中纳米纤维重量百分比的增加而升高。所得纳米复合材料表现出改善的弹性性能，在牙科复合材料和骨水泥中具有潜在应用价值。
