UNS: Electric-Field Alignment of Immiscible Polymer Blends with Dispersed Nanoparticles for Mesoporous Reactive Membranes

UNS：用于介孔反应膜的不混溶聚合物共混物与分散纳米颗粒的电场排列

• 批准号: 1511896
• 负责人: Paul Millett
• 金额: $ 41.19万
• 依托单位: University of Arkansas
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2015
• 资助国家: 美国
• 起止时间: 2015-07-01 至 2019-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1511896&HistoricalAwards=false
• 关键词: UNS; Electric; Field; Alignment; Immiscible

CBET - 1511896PI: Millett, PaulThis project uses experiments and numerical simulation to examine the dynamics of thin films of phase-separating polymers that contain nanoparticles. When phase separation occurs, the nanoparticles segregate to the interfaces between polymer phases, which locks the configuration of the phases into place. To control the spatial morphology of the thin film, an electric field is applied to align the phases and the particles perpendicular to the film. Then, one of the polymer phases can be dissolved away, leaving a membrane-like structure containing channels that are lined with the particles. The particles can be made on the scale of nanometers and they can be made catalytic, which gives rise to a variety of technological capabilities, including using the resulting membranes for chemical separations, catalysis, and in energy-related devices such as photovoltaics and light-emitting diodes.The goal of the project is to understand the microstructural morphology of melted, phase-separating polymer blends containing particles in thin films and how its evolution can be controlled by an electric field. The project will use a polymer film apparatus that can simultaneously impose elevated temperatures and out-of-pane electric fields. Experiments will be integrated with Brownian Dynamics/Cahn-Hilliard simulations to model the evolution of the thin film morphology. The experiments and simulations will combine to identify parameter ranges that optimize the desired thin film morphology. Parameters that will be investigated include the strength of the electric field required to align phases and particles, volume fractions of the polymer phases and the resulting channel dimensions, particle size and volume fraction, and film thickness.

CBET-1511896PI：Millett，Paul本项目使用实验和数值模拟来研究含有纳米颗粒的相分离聚合物薄膜的动力学。当发生相分离时，纳米粒子分离到聚合物相之间的界面，从而将相的配置锁定在适当的位置。为了控制薄膜的空间形貌，在外加电场的作用下，使薄膜的相和颗粒垂直于薄膜。然后，其中一个聚合物相可以被溶解，留下一个膜状结构，其中包含排列着颗粒的通道。粒子可以在纳米尺度上制造，并可被催化，这带来了各种技术能力，包括使用产生的膜进行化学分离、催化，以及用于与能源相关的设备，如光伏和发光二极管。该项目的目标是了解熔融的、相分离的聚合物混合物的微观结构形态，以及如何通过电场控制其演变。该项目将使用一种聚合物薄膜设备，可以同时施加高温和窗外电场。实验将与布朗动力学/Cahn-Hilliard模拟相结合来模拟薄膜形貌的演变。实验和模拟将结合起来确定优化所需薄膜形态的参数范围。将研究的参数包括排列相和颗粒所需的电场强度、聚合物相的体积分数和由此产生的沟道尺寸、颗粒大小和体积分数以及薄膜厚度。