Responsive Polymer Multilayers

响应性聚合物多层膜

• 批准号: 0209439
• 负责人: Svetlana Sukhishvili
• 金额: $ 27万
• 依托单位: Stevens Institute of Technology
• 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: 2002-09-01 至 2005-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0209439&HistoricalAwards=false
• 关键词: Responsive; Polymer; Multilayers

This research focuses on understanding the principles of building responsive polymeric materials by means of self-assembly of polymers at surfaces. Applications of the multilayering technique to produce new materials for controlled delivery of chemicals have been recently proposed, yet there is presently no adequate understanding of the response properties of multilayered films. Multilayers will be built using various copolymers that contain centers for both electrostatic and hydrogen bonding; and the fraction of monomer units within a copolymer will be systematically varied to control pH/ionic strength at which the films delaminate or swell. Novel modifications of the polymers will produce non-delaminating films with targeted response properties. The film growth and response properties will be determined by in situ ATR-FTIR spectroscopy, in situ ellipsometry in phase-modulated mode, and permeability ionizations and degree of hydrogen-bonding among the layered molecules. The second will enable measurements of the swelling of the films in different environmental measurements. The question of how they are translated into changes in film density and stability will be addressed. Finally, the knowledge of interlayer interactions, swelling and permeability of the films will be used to build polymeric containers with rationally designed response of the membrane.This research might enable the design of novel layered polymer films and capsules with targeted response characteristics. The potential applications of these materials include temporary protection layers, responsive coatings and controlled delivery of chemicals, such as pesticides, fragrances or drugs.

本研究的重点是通过聚合物在表面的自组装来理解构建响应性聚合物材料的原理。近年来，人们提出了将多层膜技术应用于化学物质控制递送的新材料，但目前对多层膜的响应特性还没有充分的了解。多层材料将使用含有静电和氢键中心的各种共聚物；共聚物中单体单元的比例将系统地改变，以控制薄膜分层或膨胀时的pH/离子强度。聚合物的新改性将产生具有目标响应特性的非分层薄膜。薄膜的生长和响应特性将通过原位ATR-FTIR光谱、相位调制模式下的原位椭圆偏振、层状分子间的渗透电离和氢键程度来确定。第二个将使测量膨胀膜在不同的环境测量。它们如何转化为薄膜密度和稳定性的变化的问题将被解决。最后，利用层间相互作用、膜的膨胀和渗透性的知识来构建具有合理设计膜响应的聚合物容器。该研究为设计具有目标响应特性的新型层状聚合物薄膜和胶囊提供了可能。这些材料的潜在应用包括临时保护层、反应涂层和化学品的控制输送，如杀虫剂、香料或药物。