Regulation of Polymer Blend Morphology using Nanospheres and Nanorods

使用纳米球和纳米棒调节聚合物共混物形态

• 批准号: 0549307
• 负责人: Russell Composto
• 金额: --
• 依托单位: University of Pennsylvania
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2006
• 资助国家: 美国
• 起止时间: 2006-09-01 至 2010-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0549307&HistoricalAwards=false
• 关键词: Regulation; Polymer; Blend; Morphology; using

TECHNICAL SUMMARY:The proposed research on "Regulation of Polymer Blend Morphology Using Nanospheres and Nanorods, "aims to understand how phase separation in polymer blendfilms affects the dispersion of nanoparticles (NP) and how NP affect phase evolution,wetting and film stability. Whereas prior studies focus on neat blends, the current studywill investigate how particle characteristics, in particular, surface chemistry and shape,influence how NP disperse and organize in a multi-phase morphology. Nanospheres ofsilica and nanorods of CdSe will be investigated. To control their location, NP arefunctionalized by acid-groups, neutral brushes, and attractive brushes. By tuning the surface properties, which control partitioning and organization, NP can be driven into onedomain or towards the interface between phases. The location of NP dictates filmcharacteristics including wetting layer growth rate, mprphology, phase evolution, andfilm stability. By controlling the location of NP, a new route for engineering phase size isexpected from these systematic studies. For example, stable biocontinuous structures canbe produced by NP "jamming" resulting in highly efficient photovoltaic devices. Theproposed research requires a palette of complementary depth and lateral profilingtechniques including ion beam etching combined with scanning electron microscopy.NON-TECHNICAL SUMMARY:Polymer nanocomposites (PNC) are foundin everyday materials such as tires andgolfballs as well as high technology devices for energy conversion and sensorapplications. PNC are examples of nano-based materials, which are driving therevolution in nanotechnology. This exploding field has received worldwide investmentstotaling $8 billion in 2004 with an anticipated impact of $2.6 trillion by 2014. Althoughhighly versatile and widely used, a fundamental understanding of PNC is lacking andbasic science is necessary to produce PNC based devises that are reliable, efficient andeconomical.During the past 3.5 years, this NSF project has provided research training for 25engineering undergraduates (10 females) and 6 high school teaching (2 female, 2minority). Two of these have received NSF Graduate Fellowships. Lectures aboutpolymer science to teachers in the Philadelphia School District has lead to greatenthusiasm about developing laboratories for a Science Van that will reach out to underrepresented nimorites in middle school. With University encouragement, the Science Van project is in the planning stages. International collaborations with scientistsfrom the United Kingdom and the Czech Republic will provide students with a betterunderstanding about research in these countries.

技术概述：“纳米球和纳米棒对聚合物共混形态的调控”的拟议研究旨在了解聚合物共混膜中的相分离如何影响纳米粒子（NP）的分散，以及NP如何影响相演化、润湿和膜稳定性。鉴于先前的研究主要集中在纯共混物上，当前的研究将研究颗粒特性，特别是表面化学和形状，如何影响NP在多相形态中的分散和组织。将研究二氧化硅纳米球和镉镉纳米棒。为了控制它们的位置，NP被酸性基团、中性刷和吸引刷功能化。通过调整控制划分和组织的表面性质，可以将NP驱动到一个域或走向相之间的界面。NP的位置决定了膜的特性，包括湿润层的生长速度、形态、相演化和膜的稳定性。通过对NP位置的控制，有望从这些系统研究中找到工程相尺寸的新途径。例如，稳定的生物连续结构可以通过NP“干扰”产生，从而产生高效的光伏器件。拟议的研究需要互补深度和横向剖面技术的调色板，包括离子束蚀刻结合扫描电子显微镜。非技术概述：聚合物纳米复合材料（PNC）广泛应用于轮胎和高尔夫球等日常材料，以及用于能量转换和传感器应用的高科技设备。PNC是纳米基材料的例子，它正在推动纳米技术的发展。这一爆炸性的领域在2004年获得了全球总计80亿美元的投资，预计到2014年将产生2.6万亿美元的影响。尽管用途广泛，但缺乏对PNC的基本理解，并且需要基础科学来生产可靠，高效和经济的基于PNC的设计。在过去的三年半时间里，该项目为25名工科本科生（10名女性）和6名高中教师（2名女性，2名少数民族）提供了研究培训。其中两人获得了NSF研究生奖学金。为费城学区的老师们举办的关于高分子科学的讲座，激发了他们为科学车开发实验室的极大热情，这种实验室将接触到中学中代表性不足的nimorites。在大学的鼓励下，科学车项目正处于规划阶段。与来自英国和捷克共和国的科学家的国际合作将使学生更好地了解这些国家的研究。