SGER: Breaking the Size-Threshold for Thermal Analysis of Polmer Thin-films: NanoDSC

SGER：突破聚合物薄膜热分析的尺寸阈值：NanoDSC

• 批准号: 0735286
• 负责人: Leslie Allen
• 金额: --
• 依托单位: University of Illinois at Urbana-Champaign
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2007
• 资助国家: 美国
• 起止时间: 2007-09-01 至 2010-02-28
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0735286&HistoricalAwards=false
• 关键词: SGER; Breaking; Size; Threshold; Thermal

TECHNICAL SUMMARY:Polymers have unusual properties when confined to very small nanometer-scale dimensions. Spatial confinement of materials in the form of thin films, small pores, or islands can have a dramatic effect on their thermodynamic properties. Recently, some experiments have shown that spatial confinement can have a large effect on the glass transition temperature Tg for polymers. Spatial confinement is also important for thin films consisting of self-assembled monolayers (SAM). In addition, processing polymers at very fast heating/cooling rates also has a dramatic effect of the material properties. Commercial differential scanning calorimeters (DSC) are the tools often used for analysis investigations of polymer material. Unfortunately, conventional DSC instruments can not be used for these type of experiments because they lack sensitivity and have scan rates which are too slow. However recently a new calorimetry technique Nanocalorimetry has been developed which has the capability of measuring extremely small samples at extremely fast cooling/heating rates. This proposal focuses on using the NanoDSC to investigate spatial confinement of the glass transition temperature of thin film polymers and the thermodynamic properties of SAMs. This research will develop methods to measure heat capacity during the cooling cycle of a scan and bridge the gap between the slow scan rates of conventional DSC and the fast rates of Nanocalorimetry.NON-TECHNICAL SUMMARY:This research is important because much of the advances in materials technology in the next generation are expected to be made by fabricating and manipulating materials at the nanometer scale dimensions. The research will provide the fundamental tools needed to examine materials at such small microscopic levels and thus allowing analysis of material that is now inaccessible when using conventional techniques. The impact of this research is to add to the infrastructure of the country for basic science as well as for technology in a critical research area. Nanocalorimetry will be especially useful in a wide range of characterization needs in nanotechnology and will be particularly important in the polymer, microelectronic, and biomedical industries. The broad impact of this research will include the education and training of graduate students in the field of nano-technology. Nanocalorimetry has already generated international collaborations and this research will increase this effort.

技术摘要：当局限于非常小的纳米尺度尺寸时，聚合物具有异常的特性。 薄膜，小毛孔或岛屿形式的材料的空间限制可能会对其热力学特性产生巨大影响。 最近，一些实验表明，空间限制可能对聚合物的玻璃过渡温度TG产生巨大影响。 空间限制对于由自组装单层（SAM）组成的薄膜也很重要。 此外，以非常快速的加热/冷却速率处理聚合物也具有材料特性的巨大效果。 商业差异扫描量热比特（DSC）是经常用于分析聚合物材料研究的工具。 不幸的是，传统的DSC仪器不能用于此类实验，因为它们缺乏灵敏度且扫描速率太慢。 然而，最近已经开发了一种新的量热法纳米钙化法，该技术具有以极快的冷却/加热速率测量极小样品的能力。 该提案的重点是使用NanoDSC研究薄膜聚合物的玻璃过渡温度和SAM的热力学特性的空间限制。 这项研究将开发在扫描的冷却周期中测量热容量的方法，并弥合常规DSC的缓慢扫描速率与纳米层列表的快速速率之间的差距。Non-echnical摘要：这项研究很重要，因为预计下一代材料技术的许多进步将通过在Nanator尺度上的构造和操纵材料来实现下一代的材料技术。 这项研究将提供在如此小的显微镜水平检查材料所需的基本工具，从而允许分析使用常规技术时现在无法访问的材料。 这项研究的影响是增加基础科学的基础设施以及关键研究领域的技术。 在纳米技术的广泛表征需求中，纳米钙化将特别有用，并且在聚合物，微电子和生物医学行业中尤为重要。 这项研究的广泛影响将包括纳米技术领域的研究生的教育和培训。 纳米级别测定已经产生了国际合作，这项研究将增加这项工作。