离心喷射纺丝高效制备聚合物纳米纤维组件：工艺与表征,Macromolecules

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离心喷射纺丝高效制备聚合物纳米纤维组件：工艺与表征
Macromolecules ( IF 5.1 ) Pub Date : 2015-04-17 00:00:00 , DOI: 10.1021/acs.macromol.5b00292
Liyun Ren ₁ , Rahmi Ozisik ₁ , Shiva P. Kotha ₁ , Patrick T. Underhill ₁

Affiliation

离心喷射纺丝（CJS）是一种高效，低成本且用途广泛的方法，用于制造聚合物纳米纤维组件，尤其是与静电纺丝相比。该方法利用离心力以及纺丝溶液的粘弹性和传质特性来促进聚合物溶液丝向纳米纤维的可控稀化。在这项研究中，根据流体粘弹性，离心力和溶剂传质的作用，分析了三个不同的纺丝阶段（喷射引发，喷射延伸和纤维形成）。使用了四种不同的聚合物溶液系统，这些系统可实现广泛的流体粘弹性和溶剂传质性能，并且针对这些聚合物溶液在不同的转速下制造了聚合物纤维。确定了确定产品形态（珠，纤维上的珠和连续纤维）和纤维半径（形成纤维时）的关键无量纲组。使用第五聚合物溶液系统测试获得的形态状态图和纤维半径模型。结果表明，在纤维延伸阶段，魏森伯格数和毛细管数对确保纤维形成至关重要，而弹性加工性数是预测纤维直径的决定性无量纲数。

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Highly Efficient Fabrication of Polymer Nanofiber Assembly by Centrifugal Jet Spinning: Process and Characterization

Centrifugal jet spinning (CJS) is a highly efficient, low-cost, and versatile method for fabricating polymer nanofiber assemblies, especially in comparison to electrospinning. The process uses centrifugal forces coupled with the viscoelastic properties and the mass transfer characteristics of spinning solutions to promote the controlled thinning of a polymer solution filament into nanofibers. In this study, three different spinning stages (jet initiation, jet extension, and fiber formation) were analyzed in terms of the roles of fluid viscoelasticity, centrifugal forces, and solvent mass transfer. Four different polymer solution systems were used, which enables a wide range of fluid viscoelasticity properties and solvent mass transfer properties, and polymer fibers were fabricated under different rotational speeds for these polymer solutions. The key dimensionless groups that determine the product morphology (beads, beads-on-fiber, and continuous fiber) and the radius of the fiber (when fibers are formed) were identified. The obtained morphology state diagram and fiber radius model were tested using a fifth polymer solution system. Results indicate that Weissenberg number and capillary number are important during the fiber extension stage to enable fiber formation while the elastic processability number is the determinative dimensionless number for fiber diameter prediction.

更新日期：2015-04-17

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