In Situ Optical Imaging of the Growth of Conjugated Polymer Aggregates
In Situ Optical Imaging of the Growth of Conjugated Polymer Aggregates
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共轭聚合物聚集体生长的原位光学成像
DOI：
10.1002/anie.201710336
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发表时间：
2018
期刊：
影响因子：
--
通讯作者：
Kaufman, Laura J.
中科院分区：
文献类型：
--
作者：
Yang, Jaesung;Park, Heungman;Kaufman, Laura J.
了解共轭聚合物聚集体形成和生长的机制可以在介观尺度上增强对聚集体形态和功能特性的控制。MEH - PPV聚集体在受控膨胀膜中实时生长的原位光学成像显示，生长通过多种机制发生，比之前描述的更复杂。为奥斯特瓦尔德成熟和骨料聚结作为溶媒膨胀膜中骨料生长的操作模式提供了直接证据。这些生长机制对生长聚集体形态秩序的演化有着明显而强烈的影响：奥斯特瓦尔德成熟可以保持高度有序的形态，而聚集体聚结的发生没有优先取向，导致有序程度的衰减。
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.