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Reversibly thermochromic and high strength core‐shell nanofibers fabricated by melt coaxial electrospinning
Journal of Applied Polymer Science ( IF 2.7 ) Pub Date : 2021-01-16 , DOI: 10.1002/app.50465 Shuoshuo Wang 1 , Liqiang Yi 1 , Yini Fang 1 , Lina Wang 1 , Juming Yao 1 , Jaromir Marek 2 , Ming Zhang 1
Journal of Applied Polymer Science ( IF 2.7 ) Pub Date : 2021-01-16 , DOI: 10.1002/app.50465 Shuoshuo Wang 1 , Liqiang Yi 1 , Yini Fang 1 , Lina Wang 1 , Juming Yao 1 , Jaromir Marek 2 , Ming Zhang 1
Affiliation
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Recent years, phase change materials (PCMs) with potential to store and transform energy have attracted broad attention, especially in the field of thermal energy storage. However, the instability and leak proneness of PCMs limit their universal application. In this paper, core‐shell fibers with 1‐tetradecanol (TD) as core and poly(vinylidene fluoride) (PVDF) as shell were prepared via melt coaxial electrospinning method, and for improvement, the dye composed of crystal violet lactone (CVL) and bisphenol A (BPA) was added to the core to endow the fiber the function of reversible thermochromism. During the preparation process, it was found that the addition of NaCl could regulate the fiber morphology and strength its mechanical property. By adjusting the concentration of shell solution and the flow rate of core solution, the high‐strength reversible thermochromic fibers were produced when polymer concentration was 24 wt% with a core feed rate of 0.4 ml/h. The latent heat of these fibers is up to 88.71 J/g. Besides, its color can change from blue to white when heated, and the transition temperature is around 38°C. And 100 thermal cycle tests of the fiber showed its strong thermal stability and thermochromic property.
中文翻译：
通过熔融同轴电纺丝制造的可逆热致变色和高强度核壳纳米纤维
近年来，具有储存和转化能量潜力的相变材料（PCM）引起了广泛的关注，特别是在热能储存领域。但是，PCM的不稳定性和泄漏倾向限制了它们的普遍应用。本文采用熔融共轴静电纺丝法制备了以1-十四烷醇（TD）为核，聚偏二氟乙烯（PVDF）为核的核壳纤维，并对其进行了改进，以制备由结晶紫内酯（CVL）组成的染料。将双酚A（BPA）添加到纤芯中，使纤维具有可逆热致变色功能。在制备过程中，发现添加氯化钠可以调节纤维的形态并增强其机械性能。通过调节壳溶液的浓度和核溶液的流速，当聚合物浓度为24 wt％，芯进料速度为0.4 ml / h时，产生了高强度可逆热致变色纤维。这些纤维的潜热高达88.71 J / g。此外，加热时其颜色可以从蓝色变为白色，转变温度约为38°C。纤维的100次热循环测试表明其具有很强的热稳定性和热致变色性能。
更新日期：2021-02-25
中文翻译：
通过熔融同轴电纺丝制造的可逆热致变色和高强度核壳纳米纤维
近年来，具有储存和转化能量潜力的相变材料（PCM）引起了广泛的关注，特别是在热能储存领域。但是，PCM的不稳定性和泄漏倾向限制了它们的普遍应用。本文采用熔融共轴静电纺丝法制备了以1-十四烷醇（TD）为核，聚偏二氟乙烯（PVDF）为核的核壳纤维，并对其进行了改进，以制备由结晶紫内酯（CVL）组成的染料。将双酚A（BPA）添加到纤芯中，使纤维具有可逆热致变色功能。在制备过程中，发现添加氯化钠可以调节纤维的形态并增强其机械性能。通过调节壳溶液的浓度和核溶液的流速，当聚合物浓度为24 wt％，芯进料速度为0.4 ml / h时，产生了高强度可逆热致变色纤维。这些纤维的潜热高达88.71 J / g。此外，加热时其颜色可以从蓝色变为白色，转变温度约为38°C。纤维的100次热循环测试表明其具有很强的热稳定性和热致变色性能。
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