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首页> 外文期刊>Journal of Applied Polymer Science >Evaluation of an onset of electrospun beadless poly(ethylene oxide) nanofibres
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Evaluation of an onset of electrospun beadless poly(ethylene oxide) nanofibres

机译：评价Electrome Beadless Poly（环氧乙烷）纳米纤维的初始

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To evaluate the lowest polymer concentration within a solvent from which there appears beadless nanofibres during the process of electrospinning, is rather complicated. A widely used method is based on a determination of so called entanglement concentration c(e) and the onsets of beadless nanofibres are characterized by multipliers of c(e) subjected to used materials. However, a determination of c(e) as an intersection point of two linear segments (in log-log coordinates specific viscosity vs. concentration) in a semi-dilute region is not applicable for all materials as for instance a solution of poly(ethylene oxide) (PEO) in water does not exhibit 'classical' three linear segments within the dilute and semi-dilute regions determining overlap and entanglement concentrations. For such cases a new approach for the evaluation of an initial concentration from which beadless nanofibres are produced is proposed. This method does not use the terms overlap and entanglement concentrations. The procedure is demonstrated using four PEO solutions differing in molecular weight. The relationship expressing initial concentration in dependence on PEO molecular weight containing no adjustable parameters is proposed.
机译：评估静电纺丝过程中出现无珠纳米纤维的溶剂中的最低聚合物浓度相当复杂。一种广泛使用的方法是基于所谓的纠缠浓度c（e）的测定，无珠纳米纤维的起始点由c（e）的倍增器根据使用的材料来表征。然而将c（e）确定为半稀释区域内两个线性段（在对数坐标系下，比粘度与浓度）的交点并不适用于所有材料，例如聚环氧乙烷（PEO）在水中的溶液在稀释和半稀释区域内不会显示“经典”三个线性段，从而确定重叠和缠结浓度。针对这种情况，提出了一种评估无珠纳米纤维初始浓度的新方法。该方法不使用术语重叠和纠缠浓度。使用四种分子量不同的PEO溶液演示了该过程。提出了初始浓度与PEO分子量的关系式，该关系式不含可调参数。

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