结合静态光散射表征和耗散粒子动力学模拟解析多级纳米线结构  

Structures of Hierarchical Nanowires Analyzed by Static Light Scattering Characterization and Dissipative Particle Dynamics Simulation

作　　者：杨文漪 吴芳升 王立权[1] 林嘉平[1] YANG Wenyi;WU Fangsheng;WANG Liquan;LIN Jiaping(Shanghai Key Laboratory of Advanced Polymer Materials,School of Materials Science and Engineering,East China University of Science and Technology,Shanghai 200237,China)

机构地区：[1]华东理工大学材料科学与工程学院,上海市先进聚合物重点实验室,上海200237

出　　处：《功能高分子学报》2022年第2期122-129,共8页Journal of Functional Polymers

基　　金：国家自然科学基金(51833003,21774032)。

摘　　要：由聚(γ-苄基-L-谷氨酸酯)-g-聚乙二醇(PBLG-g-PEG)自组装成的初级胶束可以在低温诱导下再次组装,形成一维多级纳米线。通过静态光散射表征和耗散粒子动力学模拟获取了纳米线在溶液中的结构信息,研究并分析了多级纳米线在溶液中的状态,进而探讨了初始混合溶剂和生长时间对纳米线的影响。研究表明:纳米线的形状因子与散射波矢的依赖关系与观测范围密切相关,揭示了不同聚合度纳米线的结构;多级自组装形成的纳米线可以与高分子类比,表现为刚性高分子特征,这与PBLG链的有序排列密切相关。Self-assembly of copolymer micelles has become an appealing frontier of supramolecular chemistry as a strategy to construct superstructures with multiple levels.However,how to reveal the universal law and solution behavior of the hierarchical self-assembly process is a profound issue to be explored.Supramolecular polymerization of nanoscale particles has been considered as an effective route to prepare hierarchical nanostructures.The micelles self-assembled from poly(γ-benzyl L-glutamate)-g-polyethylene glycol(PBLG-g-PEG)can further assemble into hierarchical nanowires under low-temperature conditions.The static light scattering(SLS)characterization can extract the kinetic and structural information of copolymers in solution comprehensively and effectively.The spindlelike subunits with structural defects at both ends were prepared from PBLG-g-PEG graft copolymers.To obtain the structure information of nanowires in solution,the SLS characterization and dissipative particle dynamics(DPD)simulation were combined to study and analyze the state of hierarchical nanowires in solution.The effects of initial mixed solvent and growth time on nanowires were further discussed.Results show that the dependence of the shape factor on scattering wave vectors is closely related to the length scale,which reveals the structure of nanowires with various degrees of polymerization.The formed nanowires exhibit polydispersity characteristics and certain flexibility.The nanowires formed by hierarchical self-assembly can be comparable with copolymers,which shows the characteristics of rigid polymers,which are closely related to the ordered arrangement of the PBLG chain.The research work clarifies the state of hierarchical nanowires in solutions and provides a means for analyzing assembly structure in solutions.

关 键 词：聚肽 多级自组装 静态光散射 耗散粒子动力学 纳米线 

分 类 号：O63[理学—高分子化学]