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首页> 外文期刊>RSC Advances >Rayleigh-instability-driven morphology transformation of electrospun polymer fibers imaged by in situ optical microscopy and stimulated Raman scattering microscopy
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Rayleigh-instability-driven morphology transformation of electrospun polymer fibers imaged by in situ optical microscopy and stimulated Raman scattering microscopy

机译：原位光学显微镜和受激拉曼散射显微镜成像的电纺聚合物纤维的瑞利不稳定性驱动形变

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摘要

Electrospinning is one of the most common methods to prepare polymer fibers with sizes ranging from several nanometers to hundreds of micrometers. In most studies of electrospun polymer fibers, the properties and morphologies of polymer fibers are controlled by changing the electrospinning conditions. Few studies focus on the post-treatments of polymer fibers, which are critical for many fiber-based applications. In this work, we investigate the morphology transformation of electrospun polystyrene (PS) fibers annealed on top of poly(methyl methacrylate) (PMMA) film-coated glass substrates. In situ optical microscopy and stimulated Raman scattering (SRS) microscopy are used to observe the transformation process, which is driven by the Rayleigh instability, the surface tensions, and the interfacial tensions of polymers. Depending on the thickness of the underlying PMMA films, the electrospun PS fibers may transform into hemispheres or disks. The growth rates of the undulating amplitude are also affected by the film thickness.
机译：电纺丝是制备尺寸范围从几纳米到几百微米的聚合物纤维的最常用方法之一。在大多数电纺聚合物纤维的研究中，聚合物纤维的性质和形态是通过改变电纺条件来控制的。很少有研究关注聚合物纤维的后处理，这对于许多基于纤维的应用而言至关重要。在这项工作中，我们研究了在聚甲基丙烯酸甲酯（PMMA）薄膜涂层玻璃基板上退火的电纺聚苯乙烯（PS）纤维的形态转变。原位光学显微镜和受激拉曼散射（SRS）显微镜用于观察转变过程，该过程是由瑞利不稳定性，聚合物的表面张力和界面张力驱动的。取决于下面的PMMA膜的厚度，静电纺PS纤维可能会转变为半球或盘状。起伏幅度的增长率也受到膜厚度的影响。

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