Phase-Separating Polymer Blend Films Containing Nanoparticles

含有纳米粒子的相分离聚合物共混物薄膜

• 批准号: 0234903
• 负责人: Russell Composto
• 金额: $ 34.5万
• 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: 2002
• 资助国家: 美国
• 起止时间: 2002-11-01 至 2007-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0234903&HistoricalAwards=false
• 关键词: Phase; Separating; Polymer; Blend; Films

The proposed research will focus on the dynamics of polymer blend films and polymer blend films containing nanoparticles. Control of film properties, such as hardness and permeability, are greatly complicated by the simultaneous occurrence of phase separation and wetting. Using lateral and depth profiling techniques, the phase evolution and wetting behavior of blends with a critical composition will be investigated for films as thin as 10 nm, ca. radius of gyration. By controlling domain size and spacing, membranes with monodisperse, submicron pores will be prepared. The phase and wetting dynamics of off-critical blends will be studied to gain control over film stability, interfacial area between phases, and wetting structure. New evolutionary pathways are anticipated yielding better insight into phase separation, wetting and capillary fluctuations in confined spaces. The second project will investigate how inert fillers, in particular mobile nanoparticles, modify the rate and morphology of phase separation in polymer blend films. After evaluating silica nanoparticle diffusion and wetting, the effect of particle size, concentration and wettability on domain evolution and morphology will be evaluated using the experimental techniques developed for the previous study as well as new techniques for depth and lateral profiling of the nanoparticles within the film.The proposed research is important because thin polymer films containing multiple components are critical to many technologies including photolithography, adhesives, and displays. In particular, experimental studies of polymer blends containing filler greatly lag both theory and commercial applications. Fundamental studies will be complimented by studies of commercial filler-polymer films of interest to the automotive coatings industry. Outreach programs including a second cable TV show on polymers, demonstrations at public and private elementary schools as well as high school teacher training will continue as will training of undergraduate students.

本文主要研究了聚合物共混膜和含纳米颗粒聚合物共混膜的动力学特性。由于相分离和润湿同时发生，膜的硬度和渗透性等性能的控制变得非常复杂。使用横向和深度剖面技术，将研究具有临界成分的共混物的相演变和润湿行为，薄膜厚度为10nm，约为旋转半径。通过控制畴的大小和间距，可以制备出具有单分散、亚微米孔的膜。将研究非临界共混物的相和润湿动力学，以获得对膜稳定性、相间界面面积和润湿结构的控制。新的进化途径有望更好地了解相分离，润湿和毛细管波动在密闭空间。第二个项目将研究惰性填料，特别是可移动的纳米颗粒，如何改变聚合物共混膜中相分离的速率和形态。在评估了二氧化硅纳米颗粒的扩散和润湿之后，将使用为先前研究开发的实验技术以及纳米颗粒在膜内的深度和横向剖面的新技术来评估颗粒大小、浓度和润湿性对畴演化和形态的影响。这项研究非常重要，因为包含多种成分的聚合物薄膜对光刻、粘合剂和显示等许多技术至关重要。特别是含填料的聚合物共混物的实验研究在理论和商业应用上都存在很大的滞后。基础研究将辅以对汽车涂料工业感兴趣的商业填料-聚合物薄膜的研究。有关聚合物的第二次有线电视节目、公立和私立小学的示范以及高中教师培训等推广项目将继续进行，对本科生的培训也将继续进行。