GOALI: Mechanical and Molecular Behavior of Nanoparticulate/Polymer Composites

摘要9871894，Schadler/RPI最近的工作表明，纳米颗粒填充可以同时提高聚合物复合材料的弹性模量、破坏应变和强度。在微米级填充系统中没有观察到这一点。这项建议有两个目标：1)创造和研究用于工程应用的新型纳米填料/聚合物复合材料；2)通过了解颗粒分散性、颗粒结构和表面化学以及聚合物链刚性对结合聚合物层尺寸和力学性能的影响，对其结构-性能关系有一个基本的了解。将使用气体冷凝法合成纳米颗粒填料。用这种方法可以合成各种尺寸(直径)为5-50 nm的金属、陶瓷和复合纳米粒子。此外，还可以对纳米颗粒进行涂层，以修饰其表面。纳米填料/聚合物复合材料将使用弹性体、热塑性塑料和热固性材料制备。微观结构的表征将使用各种技术，如透射电子显微镜、扫描电子显微镜和X射线衍射。纳米粒子对周围聚合物区域的影响将被用来在更宏观的尺度上证实核磁共振观察。微拉曼光谱将用于了解微(纳米)机械行为。这些新复合材料的测试力学性能将与现有的纤维和颗粒填充复合材料的力学性能进行比较。本研究对高模、高强聚合物复合材料的制备具有一定的指导意义。对纳米复合材料的制造和测试的研究将补充RPI关于纳米材料的教育倡议。该项目是根据NSF 98-20，纳米技术伙伴关系：功能纳米结构(FNS)的合成、加工和利用提交的一份提案。

Abstract 9871894, Schadler/RPI Recent work has shown that the modulus, strain to failure, and strength of polymer composites can be increased simultaneously with nanosized particle filler. This is not observed in micron sized filled systems. This proposal has dual objectives: 1) to create and investigate novel nanofiller/polymer composites for engineering application sand 2) to develop a fundamental understanding of their structure-property relationships through understanding the effects of particle dispersion, particle structure and surface chemistry, and polymer chain stiffness on the size of the bound polymer layer and on the mechanical properties. Nanoparticle fillers will be synthesized using the gas condensation method. A wide range of metal, ceramic, and composite nanoparticles will be synthesized in the size (diameter) range of 5-50 nm by this method. In addition, the nanoparticles can be coated to modify their surfaces. Nanofiller/polymer composites will be prepared using elastomers, thermoplastics, and thermosets. Microstructural characterization will be done using a variety of techniques such as TEM, SEM and X-ray diffraction. The effect of the nanoparticle on the surrounding polymer region will be used to confirm the NMR observations on a more macroscopic scale. Micro-Raman spectroscopy will be used to gain an understanding of the micro(nano)mechanical behavior. The measured mechanical properties of these new composites will be compared with those of existing fiber and particle filled composites. This research is relevant to fabrication of high modulus, high strength polymer composites. Research on the fabrication and testing of nanocomposites will complement an educational initiative at RPI on nanomaterials. This project results from a proposal submitted in response to NSF 98-20, Partnership in Nanotechnology: Synthesis, Processing, and Utilization of Functional Nanostructures (FNS).