偶氮聚合物光致粘流和纳/微米结构构筑研究

Azo polymers are well known as a new kind of photoresponsive materials. Photofluidization is a unique property of azo polymers and has been intensively investigated in recent years. The photofluidization mechanism and nano/microstructure construction based on this feature are research topics with scientific and practical significance. The proposed project plans to carry out the study on the mechanism of photofluidization and the construction, modification and applications of nano/microstructures based on this unique property. We propose to study the effects of photoisomerization and exited states of azo polymers on the photofluidization; study the mechanism of surface-relief-grating formation, self-structured surface pattern formation and colloid deformation under the different light irradiation conditions; explore the way to construct nano/microstructures based on azo polymers and other materials by using the photofluidization in combination with selfassembly, light irradiation, soft-lithography; study the influences of the molecular structures, interaction at different levels and preparation conditions on the processes. The study aims at the establishment of the methods for real applications through the approach from the molecular design to the high-efficient preparation. The proposed study will also focus on the modulation of the prepared nano/microstructures to light and its applications. The general purpose of this project is to discover the basic rules and establish theory based on thorough experimental investigations and develop new kinds of nano/microstructure manufacture techniques and materials for real applications.

偶氮聚合物是一类光响应性新材料。光致粘流是偶氮聚合物特有的重要性能，有关其微观机理和基于该特性的纳/微米结构构筑是具有十分重要科学意义和应用价值的研究课题。本项目拟深入研究光致粘流从分子到凝聚态的作用机理，并研究利用该特性构筑纳/微米结构的新方法和应用等。拟研究的内容包括：研究偶氮生色团顺反异构及激发态能量传递与光致粘流的关系。研究偶氮聚合物在各种光场辐照条件下，形成表面起伏光栅、形成自有序表面结构和胶体球形变等的微观机理。利用光致粘流特性，并结合自组装、光辐照和软光刻等手段构筑偶氮聚合物和其它材料的纳/微米结构；深入研究分子结构、分子间作用力和制备条件等在纳/微米结构形成过程中的作用。建立从分子设计出发，高效可控地制备纳/微米结构的实用方法。阐明制备的纳/微米结构对光的调制作用和器件应用原理。在实验的基础上，建立描述普遍性规律的理论和模型，得到有实用前景的纳/微米结构新材料。

偶氮聚合物是一类光响应性新材料。光致形变和光致粘流是偶氮聚合物特有的重要性能，有关其微观机理和基于该特性的纳/微米结构构筑是具有十分重要科学意义和应用价值的研究课题。本项目从分子到凝聚态深入研究了光致形变和光致粘流，研究了利用该类特性构筑纳/微米结构的新方法和应用等。本项目在新的偶氮聚合物和分子玻璃材料合成及其光响应性、偶氮聚合物的光致形变和光致粘流性能、偶氮聚合物在溶液中的自组装、偶氮聚合物微球表面光调控和光响应性Janus粒子、偶氮聚合物光栅应用等方面开展了系统研究，完成了计划的研究内容，达到了预期目标。建立从分子设计出发，高效可控地制备纳/微米结构的实用方法。阐明制备的纳/微米结构对光的调制作用和可能的应用等。在实验的基础上，阐明了有关规律和机理，得到有实用前景的纳/微米结构新材料。在上述研究的基础上，发表SCI收录的研究论文35篇，在Springer出版社出版学术专著一部，为John Wiley & Sons出版社Encyclopedia of Polymer Science and Technology撰写一章。在项目进行期间，共有7位博士、1位硕士获得学位毕业，目前还有4位博士在读；项目负责人和研究生多次参加国际学术会议，并做邀请报告和口头报告等。