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首页> 外文期刊>Journal of Materials Chemistry, A. Materials for energy and sustainability >Directed phase separation of PFO:PS blends during spin-coating using feedback controlled in situ stroboscopic fluorescence microscopy
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Directed phase separation of PFO:PS blends during spin-coating using feedback controlled in situ stroboscopic fluorescence microscopy

机译：使用反馈控制的原位频闪荧光显微镜在旋涂过程中PFO：PS共混物的直接相分离

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摘要

Uniform thin-films of polymer blends can be produced through spin-coating, which is used on an industrial scale for the production of light emitting diodes, and more recently organic photovoltaic devices. Here, we present the results of the direct observation, and control, over the phase separation of polystyrene and poly(9,9'-dioctylfluorene) during spin-coating using high speed stroboscopic fluorescence microscopy. This new approach, imaging the fluorescence, from a blend of fluorescent + non-fluorescent polymers allows for intensity to be directly mapped to composition, providing a direct determination of composition fluctuations during the spin-coating process. We have studied the compositional development and corresponding structural development for a range of compositions, which produce a range of different phase separated morphologies. We initially observe domains formed by spinodal decomposition, coarsening via Ostwald Ripening until an interracial instability causes break-up of the bicontinuous morphology. Ostwald ripening continues, and depending upon composition a bicontinuous morphology is re-established. By observing compositional and morphological development in real-time, we are able to direct and control morphological structure development through control of the spin coating parameters via in situ feedback.
机译：可以通过旋涂来生产聚合物共混物的均匀薄膜，该旋涂在工业规模上用于生产发光二极管以及最近的有机光伏器件。在这里，我们介绍了使用高速频闪荧光显微镜在旋涂过程中对聚苯乙烯和聚（9,9'-二辛基芴）的相分离进行直接观察和控制的结果。这种由荧光+非荧光聚合物的混合物对荧光成像的新方法可以将强度直接映射到组成上，从而直接确定旋涂过程中组成的波动。我们已经研究了一系列成分的成分发展和相应的结构发展，这些成分产生了一系列不同的相分离形态。我们最初观察到由旋节线分解形成的区域，通过奥斯特瓦尔德熟化进行粗化，直到异族不稳定导致双连续形态破裂。奥斯特瓦尔德熟化持续进行，并且根据组成重新建立了双连续形态。通过实时观察组成和形态的发展，我们能够通过原位反馈控制旋涂参数来指导和控制形态结构的发展。

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