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首页> 外文期刊>Journal of Applied Polymer Science >Stabilized electrospinning of heat stimuli/in situ crosslinkable nanofibers and their self-same nanocomposites
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Stabilized electrospinning of heat stimuli/in situ crosslinkable nanofibers and their self-same nanocomposites

机译：热刺激/原位可交联纳米纤维及其自身相同的纳米复合材料的稳定电纺

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摘要

We present a strategy for stabilizing the morphological integrity of electrospun polymeric nanofibers by heat stimuli in situ crosslinking. Amorphous polymer nanofibers, such as polystyrene (PS) and its co-polymers tend to lose their fiber morphology during processing at temperatures above their glass transition temperature (T-g) typically bound to happen in nanocomposite/structural composite applications. As an answer to this problem, incorporation of the crosslinking agents, phthalic anhydride (PA) and tributylamine (TBA), into the electrospinning polymer solution functionalized by glycidylmethacrylate (GMA) copolymerization, namely P(St-co-GMA), is demonstrated. Despite the presence of the crosslinker molecules, the electrospinning polymer solution is stable and its viscosity remains unaffected below 60 degrees C. Crosslinking reaction stands-by and can be thermally stimulated during post-processing of the electrospun P(St-co-GMA)/PA-TBA fiber mat at intermediate temperatures (below the T-g). This strategy enables the preservation of the nanofiber morphology during subsequent high temperature processing. The crosslinking event leads to an increase in T-g of the base polymer by 30 degrees C depending on degree of crosslinking. Crosslinked nanofibers are able to maintain their nanofibrous morphology above the T-g and upon exposure to organic solvents. In situ crosslinking in epoxy matrix is also reported as an example of high temperature demanding application/processing. Finally, a self-same fibrous nanocomposite is demonstrated by dual electrospinning of P(St-co-GMA) and stabilized P(St-co-GMA)/PA-TBA, forming an intermingled nanofibrous mat, followed by a heating cycle. The product is a composite of crosslinked P(St-co-GMA)/PA-TBA fibers fused by P(St-co-GMA) matrix. (c) 2016 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2016, 133, 44090.
机译：我们提出了一种通过热刺激原位交联来稳定电纺聚合物纳米纤维形态完整性的策略。非晶态聚合物纳米纤维，例如聚苯乙烯（PS）及其共聚物，在高于其玻璃化转变温度（T-g）的温度下进行加工时，往往会失去其纤维形态，通常会发生在纳米复合材料/结构复合材料应用中。为解决该问题，已证明将交联剂，邻苯二甲酸酐（PA）和三丁胺（TBA）掺入通过甲基丙烯酸缩水甘油酯（GMA）共聚功能化的静电纺丝聚合物溶液中，即P（St-co-GMA）。尽管存在交联剂分子，电纺聚合物溶液仍然稳定，并且其粘度在60摄氏度以下仍不受影响。交联反应处于待命状态，可在电纺P（St-co-GMA）/的后处理过程中受到热刺激PA-TBA纤维毡处于中等温度（低于Tg）。该策略使得能够在随后的高温处理期间保留纳米纤维形态。取决于交联度，交联事件导致基础聚合物的T-g增加30℃。交联的纳米纤维能够在T-g之上以及暴露于有机溶剂后保持其纳米纤维形态。还报道了在环氧基质中的原位交联作为高温要求的应用/处理的实例。最后，通过对P（St-co-GMA）和稳定的P（St-co-GMA）/ PA-TBA进行双重静电纺丝，形成混杂的纳米纤维垫，然后进行加热循环，证明了相同的纤维纳米复合材料。该产品是交联的P（St-co-GMA）/ PA-TBA纤维与P（St-co-GMA）基质融合而成的复合材料。 （c）2016 Wiley Periodicals，Inc. J. Appl。 Polym。科学2016，133，44090。

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