Responsive Polymer Multilayers

这项研究的重点是了解通过聚合物在表面自组装来构建响应性聚合物材料的原理。多层膜技术应用于生产控制输送化学品的新材料，但目前对多层膜的响应特性还没有足够的了解。多层膜将使用包含静电和氢键中心的各种共聚物来构建；共聚物中单体单元的比例将被系统地改变，以控制薄膜分层或膨胀的pH/离子强度。对聚合物进行新颖的修饰将产生具有靶向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、位相调制模式的原位椭偏测量以及层状分子之间的渗透性电离和氢键程度来确定。第二个将能够在不同的环境测量中测量薄膜的膨胀。如何将它们转化为胶片密度和稳定性的变化的问题将得到解决。最后，利用膜的层间相互作用、溶胀和渗透性的知识来构建具有合理设计的膜响应的聚合物容器。这一研究可能使设计具有靶向响应特性的新型层状聚合物膜和胶囊成为可能。这些材料的潜在应用包括临时保护层、响应性涂层和控制下的化学品输送，如杀虫剂、香料或药物。

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.