In this study, the effect of 10,12-pentacosadiynoic acid (PCDA) on the fabrication of PDA/PU nanofibers was examined. The PDA/PU nanofibers were prepared by electrospinning PU and PCDA at different mixing ratios, followed by photopolymerization. The viscosity and conductivity of the spinning solution and the morphology of the fabricated nanofibers were analyzed. We also examined the chemical structure changes, physical structure changes, and color transition characteristics of PDA/PU nanofibers. The concentrations of the spinning solutions and the mixing ratio of PCDA and PU had significant effects on the viscosity of the spinning solution and the diameter and shape of the nanofibers. The optimum conditions for economic efficiency and the practicality of the fabrication of a PDA/PU nano-fibers were 12–14 wt% spinning solution and a ratio of PU to PCDA of 4 to 1 or greater. For these conditions, the viscosity was in the range of 225–290 cP, which resulted in the production of smooth, uniform PDA/PU nanofibers without beads. The diameters of the nanofibers ranged from 270 to 550 nm. The results of FT-IR, XRD and DSC analyses confirmed that the PCDA were well mixed with the PU molecules and were electrospun. The fabricated PDA/PU nanofibers exhibited color transition phenomenon by external temperature stimulation above 70 °C.

中文翻译：

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10,12-戊二醛酸对静电纺丝PDA / PU纳米纤维形态和特性的影响

在这项研究中，研究了10,12-戊二醛酸（PCDA）对PDA / PU纳米纤维制造的影响。PDA / PU纳米纤维的制备方法是将PU和PCDA以不同的混合比进行静电纺丝，然后进行光聚合。分析了纺丝溶液的粘度和电导率以及制备的纳米纤维的形态。我们还检查了PDA / PU纳米纤维的化学结构变化，物理结构变化和颜色转变特征。纺丝溶液的浓度以及PCDA和PU的混合比例对纺丝溶液的粘度以及纳米纤维的直径和形状有显着影响。经济效率和制造PDA / PU纳米纤维的实用性的最佳条件是12–14 wt％的纺丝溶液，PU与PCDA的比例为4：1或更大。在这些条件下，粘度在225-290 cP的范围内，这导致生产出光滑，均匀的无珠粒的PDA / PU纳米纤维。纳米纤维的直径为270至550nm。FT-IR，XRD和DSC分析的结果证实PCDA与PU分子充分混合并被静电纺丝。通过高于70°C的外部温度刺激，制成的PDA / PU纳米纤维表现出颜色过渡现象。纳米纤维的直径为270至550nm。FT-IR，XRD和DSC分析的结果证实PCDA与PU分子充分混合并被静电纺丝。通过高于70°C的外部温度刺激，制成的PDA / PU纳米纤维表现出颜色过渡现象。纳米纤维的直径为270至550nm。FT-IR，XRD和DSC分析的结果证实PCDA与PU分子充分混合并被静电纺丝。通过高于70°C的外部温度刺激，制成的PDA / PU纳米纤维表现出颜色转变现象。