Recent progress in microfluidic technology allows fabricating microfluidic devices to produce liquid microjets with unprecedented control of the jet diameter and velocity. Here it is demonstrated that microfluidic devices based on the gas dynamic virtual nozzle principle can be excellently used for micro solution blow spinning to continuously fabricate microfibers with excellent control of the fiber diameter and the internal crystalline alignment that determines the mechanical properties. Fiber spinning experiments with small‐ and wide‐angle X‐ray scattering are combined to directly relate the macroscopic spinning conditions to the bulk and molecular structure of the resulting fibers. The elongational rate is shown as the relevant parameter that transduces the nozzle flow conditions to the local macromolecular structure and orientation, and thus the mechanical properties of the resulting fiber. It is observed that the spinning process results in very uniform microfibers with a well‐defined shish–kebab crystal structure, which evolves into an extended chain crystal structure upon plastic deformation. Thus, the presented microfluidic spinning methodology has great implications for a precisely controlled production of microfibers using miniaturized spinning devices.

中文翻译：

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通过微溶液吹纺控制聚合物微纤维的结构

微流体技术的最新进展使得制造微流体装置能够生产出液体微射流，并且对射流的直径和速度进行了空前的控制。在此证明，基于气体动态虚拟喷嘴原理的微流控设备可以很好地用于微溶液吹纺，以连续制造微纤维，并且可以很好地控制纤维直径和决定机械性能的内部晶体取向。结合了具有小角度和广角X射线散射的纤维纺丝实验，可以直接将宏观纺丝条件与所得纤维的体积和分子结构联系起来。伸长率显示为将喷嘴流动条件转换为局部大分子结构和取向的相关参数，以及由此产生的纤维的机械性能。可以观察到，纺丝过程会产生非常均匀的超细纤维，具有明确的烤肉串晶体结构，并在塑性变形时演变成延伸的链状晶体结构。因此，提出的微流体纺丝方法对于使用小型化纺丝设备的精确控制的微纤维生产具有重大意义。