Processing-Structure-Property Relationship in the Fabrication of Hybrid Nanostructured Materials with Tunable Architecture

具有可调结构的混合纳米结构材料制造中的加工-结构-性能关系

• 批准号: 1331437
• 负责人: Devesh Misra
• 金额: $ 37.49万
• 依托单位: University of Louisiana at Lafayette
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2013
• 资助国家: 美国
• 起止时间: 2013-08-01 至 2014-09-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1331437&HistoricalAwards=false
• 关键词: Processing; Structure; Property; Relationship; Fabrication

The research objective of the award is to study the fabrication of organic-inorganic hybrid nanostructured materials in such a way as to create strong adhesion or bond between the constituent phases of a composite, while retaining the individual properties of the constituent phases. The fabrication process involves direct nucleation and growth of polymer nanocrystals along the axis of carbon nanotubes with the help of high pressure. These polymer nanocrystals are responsible for the strong bond between the nanotube and the matrix phases in the nanocomposite. Furthermore, the fabrication will also provide the ability to tune the structural morphology of the hybrid structure at different length-scales by controlling the crystallization pressure and liquid undercooling or the degree to which the polymer melt is cooled below its equilibrium crystallization temperature. Thermodynamic models with predictive capabilities will be developed for a wide range of nanoparticle-polymer systems and will be based on thermodynamically-driven chemical interactions at the polymer crystal-nanoparticle interface. Successful completion of the research will provide generic guidelines governing pressure-induced fabrication of hybrid nanostructured materials for a variety of applications.An important advantage of direct nucleation of polymer crystals on carbon nanotubes is to eliminate the need to modify the surface or functionalization of carbon nanotubes prior to their use in the fabrication of hybrid nanocomposites. Thus, the un-modified carbon nanotubes will retain their extraordinary electrical, optical, and mechanical properties and their full potential, when present in small amounts, can be realized. This aspect will be of particular interest in the development of next generation of photovoltaic and data storage devices. Moreover, the direct polymer nanocrystal nucleation method will overcome the technological barrier of obtaining strong adhesion between the constituent phases and thereby will open-up a new avenue for fabricating high performance materials. The confluence of understanding and the realization of processing of polymers containing nanoparticles under pressure-induced nucleation conditions have far reaching impact in applications such as barrier liners in storage tanks and fuel liners for cryogenic fuel storage in aerospace.

该奖项的研究目标是研究有机-无机杂化纳米结构材料的制造，以便在复合材料的组成相之间产生牢固的粘附或结合，同时保留组成相的各自特性。制造过程涉及在高压的帮助下沿着碳纳米管轴直接成核和生长聚合物纳米晶体。这些聚合物纳米晶体负责纳米管和纳米复合材料中基质相之间的牢固结合。此外，该制造还将提供通过控制结晶压力和液体过冷度或聚合物熔体冷却到其平衡结晶温度以下的程度来调节不同长度尺度的混合结构的结构形态的能力。具有预测能力的热力学模型将针对广泛的纳米颗粒-聚合物系统而开发，并将基于聚合物晶体-纳米颗粒界面处热力学驱动的化学相互作用。该研究的成功完成将为各种应用的混合纳米结构材料的压力诱导制造提供通用指南。聚合物晶体在碳纳米管上直接成核的一个重要优点是消除了对碳纳米管表面改性或功能化的需要在将其用于制造混合纳米复合材料之前。因此，未改性的碳纳米管将保留其非凡的电学、光学和机械性能，并且在少量存在时可以发挥其全部潜力。这方面在下一代光伏和数据存储设备的开发中将受到特别关注。此外，直接聚合物纳米晶成核方法将克服组成相之间获得强粘附力的技术障碍，从而为制造高性能材料开辟新途径。在压力诱导成核条件下加工含有纳米粒子的聚合物的理解和实现的融合对储罐中的屏障衬里和航空航天中用于低温燃料储存的燃料衬里等应用产生了深远的影响。