以对苯撑乙烯撑寡聚物为核的多组分纤维状胶束的超组装行为研究

p-conjugated polymers are attractive functional materials with broad applications. Preparation of nanostructured p-conjugated polymers is an efficient approach to improve their related properties and expand their applications. The key issue in the field of nanostructured p-conjugated materials is how to efficiently prepare p-conjugated-polymer-based nanostructures with precise control over their sizes, compositions and morphologies. PPV and its derivatives are typical p-conjugated polymers. In this project, we are planning to prepare a series of multicomponent fiber-like micelles containing oligo(p-phenylenevinylene)(OPV)-core by “seeded growth” of living crystallization-driven self-assembly. Subsequently, the obtained multicomponent fiber-like micelles are self-assembled or co-assembled with other polymers, single-component fiber-like micelles, multicomponent fiber-like micelles, spherical polymer micelles or inorganic nanoparticles to prepare a series of OPV-based (stimuli-responsive) hierarchical multicomponent superstructures with precise control over their architecture and functionality by using non-covalent interactions (hydrophobic effect, hydrogen-bonding and host-guest interaction) as the driving force. It is believed that the strategy developed in this project will open a new avenue to prepare other p-conjugated-polymer-based hierarchical multicomponent superstructures with precise control over their architecture and functionality.

共轭聚合物是一类具有广泛应用的功能高分子，而共轭聚合物的纳米化是提高其性能并扩展其应用领域的一条有效途径。如何高效地制备具有精确的尺寸、化学组成和拓扑结构的共轭聚合物基纳米结构始终是基于共轭聚合物纳米功能材料领域的一个核心关键问题。聚对苯撑乙烯撑及其衍生物是一类典型共轭聚合物。我们拟利用“种子增长”的活性结晶驱动自组装制备一系列以对苯撑乙烯撑寡聚物为核的多组分(多面性)纤维状胶束；在此基础上，以非共价作用(疏溶剂作用、氢键作用和主客体包覆作用)为驱动力，通过多组分(多面性)纤维状胶束自组装或与聚合物、单组分或多组分纤维状胶束、聚合物胶束或无机纳米粒子共组装，构建以对苯撑乙烯撑寡聚物为主体的(具有不同刺激响应性的)多组分高层次超组装结构。本项目的实施将为构建基于其他不同应用前景的共轭高分子的多组分高层次超组装结构的提供一条新的途径。

共轭聚合物纳米纤维由于其独特的光电性能以及拓扑结构的精准可控性使其在光电、生物以及光催化材料领域展现出广阔的应用前景。然而构筑尺寸/组成/序列结构精准可控的共轭聚合物纳米纤维仍是一个重要的挑战。基于我们发展的“单一链长共轭组装基元”结晶驱动自组装的策略，并融合了超分子化学的概念，我们取得了以下重要的研究成果：.(1) 发展了基于络合和氢键作用实现共轭聚合物纳米纤维多功能化的策略，实现了尺寸/组成/序列结构精准可控的共轭聚合物纳米纤维及其杂化多功能体系的构建;.(2) 建立利用共价键和非共价键作用赋予共轭聚合物纳米纤维拓扑和溶液稳定性的新方法，制备了高稳定性的长度/组成可控的共轭聚合物纳米纤维；.(3) 成功将该策略进一步的推广到其他不同组成和功能的D-A-D型共轭聚合物体系中，制备了系列具有疾病诊疗和催化活性的多功能共轭聚合物纳米纤维基功能材料。.这些研究成果将为制备结构和功能精准可控共轭聚合物纳米纤维基功能材料可控制备及其在光电、生物以及光催化领域的应用打下坚实的基础。