Department of Chemistry, Columbia University, 3000 Broadway, New York, NY, 10027, USA.
Department of Physics and Astronomy, Texas A&M University-Commerce, Commerce, TX, 75429, USA.
Angew Chem Int Ed Engl. 2018 Feb 12;57(7):1826-1830. doi: 10.1002/anie.201710336. Epub 2018 Jan 24.
Understanding the mechanisms that contribute to conjugated polymer aggregate formation and growth may yield enhanced control of aggregate morphology and functional properties on the mesoscopic scale. In situ optical imaging of the growth of MEH-PPV aggregates in real time in controlled swollen films shows that growth occurs through multiple mechanisms and is more complex than previously described. Direct evidence is provided for both Ostwald ripening and aggregate coalescence as operative modes of aggregate growth in solvent swollen films. These growth mechanisms have a distinct and strong impact on the evolution of morphological order of growing aggregates: while Ostwald ripening allows preservation of highly ordered morphology, aggregate coalescence occurs with no preferential orientation, leading to attenuation in degree of ordering.
理解导致共轭聚合物聚集形成和生长的机制，可以在介观尺度上增强对聚集形态和功能性质的控制。在受控溶胀膜中实时原位光学成像 MEH-PPV 聚集物的生长表明，生长通过多种机制发生，比以前描述的更为复杂。为溶剂溶胀膜中聚集物生长的奥斯特瓦尔德熟化和聚集合并这两种作用模式提供了直接证据。这些生长机制对生长聚集物的形态有序性的演变有明显而强烈的影响：虽然奥斯特瓦尔德熟化允许保持高度有序的形态，但聚集合并没有优先取向，导致有序度降低。
