In-situ Studies of Morphology Evolution in Polymer-Clay Nanocomposites during Processing and Deformation

聚合物-粘土纳米复合材料在加工和变形过程中形态演变的原位研究作者：巴克纳尔Beckham和Yonathan S. ThioGeorgia Institute of Technology项目摘要聚合物-硅酸盐纳米复合材料将在模拟（1）加工和（2）变形断裂的大应变条件下用X射线散射进行原位检查。 同时小角度和广角X射线散射将被用来收集实时结构数据，在双轴拉伸条件下，匹配商业热吹塑薄膜加工，并在单轴拉伸大应变变形测量。 纳米复合材料样品将在加工和变形研究之前和之后使用补充技术进行表征，包括透射电子显微镜，热和机械性能测量。 这些实验研究将与多尺度建模研究工作密切合作，为特定应用设计纳米复合材料创建预测工具。拟议的研究将与研究生和本科教育在格鲁吉亚技术相结合，并将在同一时间提供推广到当地高中的机会。 拟议的研究也具有广泛的影响，技术开始商业化利用聚合物-硅酸盐纳米复合材料的应用，从包装到汽车零部件。 在这些纳米复合材料的结构/性能关系的经验发展，导致知识的形态类型，可以形成不同的起始配方，以及如何这涉及到他们观察到的性能。 尽管如此，对于纳米复合材料形态在加工过程中如何达到其特征形式，以及这些结构如何在大规模变形下变形至断裂，我们知之甚少。 这种知识，这是需要补充我们的合作者正在进行的综合建模研究，可以通过进行纳米复合材料加工和变形的原位研究提供。

In-situ Studies of Morphology Evolution in Polymer-Clay Nanocomposites during Processing and DeformationDavid G. Bucknall, Haskell W. Beckham and Yonathan S. ThioGeorgia Institute of TechnologyProject Abstract Polymer-silicate nanocomposites will be examined in situ with X-ray scattering under large-strain conditions that mimic (1) processing and (2) deformation to fracture. Simultaneous small-angle and wide-angle X-ray scattering will be employed to collect real-time structural data during biaxial stretching conditions which match commercial thermal blown film processing, and during uniaxial stretching for large-strain deformation measurements. Nanocomposite samples will be characterized before and after the processing and deformation studies using complementary techniques that include transmission electron microscopy, thermal and mechanical property measurements. These experimental studies will be conducted in close cooperation with a multi-scale modeling research effort to create a predictive tool for designing nanocomposites for a given application. The proposed research will be integrated with graduate and undergraduate education at Georgia Tech and will at the same time provide opportunities for outreach to local high schools. The proposed research also has broad implications for technologies which are beginning to commercially exploit polymer-silicate nanocomposites in applications from packaging to automotive components. The empirical development of structure/property relationships in these nanocomposite materials has lead to knowledge of types of morphologies that can be formed from different starting recipes, and how this relates to their observed properties. Despite this, relatively little is known about how nanocomposite morphologies reach their characteristic forms during processing, nor how these structures deform under large-scale deformation to fracture. This knowledge, which is needed to complement the comprehensive modeling studies being undertaken by our collaborators, can be provided by conducting in-situ studies of nanocomposite processing and deformation.