Abstract In this study, polyaniline nanoparticles (PANI NPs) in emeraldine base (EB) form were prepared by a modified method and characterized by FTIR and UV–vis spectroscopies. The average size of the nanoparticles was 140 nm measured by DLS method. The nanoparticles were embedded into polylactic acid (PLA) nanofibers prepared by electrospinning method. It was found that inclusion of PANI NPs in PLA resulted in reduced diameter of the fibers during the electrospinning process. Also, the surface of nanofibers appeared smooth in FE-SEM images without formation of beads. Improvement in mechanical and electrical properties of PLA/PANI nanofibers over the neat PLA nanofibers implied a good dispersion of PANI NPs in PLA matrix and existence of fairly strong interactions between two polymers. Also, wettability tests revealed that PLA/PNAI nanofibers were less hydrophobic than neat PLA. To explore the effect of irradiation on physical properties of the nanofibers, the nanofibers were exposed to gamma ray at 25 kGy which is a typical dose for sterilization of bio-implants. Then, the physical properties of irradiated nanofibers were compared with the non-irradiated counterparts in terms of electrical, mechanical and thermal properties. Also, morphology and hydrophilicity of the surface of the nanofibers after irradiation were compared with non-irradiated ones. It was concluded that gamma irradiation contributed to stronger interfacial interactions between PLA and PANI NPs that resulted in further improvements on the desired properties of the nanofibers such as wettability, electrical conductivity and tensile strength.

中文翻译：

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伽马辐照的导电聚乳酸/聚苯胺纳米纤维

摘要 在本研究中，采用改进的方法制备了祖母绿碱 (EB) 形式的聚苯胺纳米粒子 (PANI NPs)，并通过 FTIR 和紫外-可见光谱对其进行了表征。通过DLS方法测量的纳米颗粒的平均尺寸为140nm。将纳米颗粒嵌入通过静电纺丝法制备的聚乳酸（PLA）纳米纤维中。发现在 PLA 中包含 PANI NP 会导致静电纺丝过程中纤维的直径减小。此外，纳米纤维的表面在 FE-SEM 图像中看起来很光滑，没有形成珠子。与纯 PLA 纳米纤维相比，PLA/PANI 纳米纤维在机械和电学性能方面的改进意味着 PANI NPs 在 PLA 基质中具有良好的分散性，并且两种聚合物之间存在相当强的相互作用。还，润湿性测试表明，PLA/PNAI 纳米纤维的疏水性低于纯 PLA。为了探索辐照对纳米纤维物理特性的影响，将纳米纤维暴露于 25 kGy 的伽马射线，这是生物植入物灭菌的典型剂量。然后，在电学、机械和热性能方面将辐照纳米纤维的物理性质与未辐照的对应物进行比较。此外，将辐照后纳米纤维表面的形态和亲水性与未辐照的进行了比较。得出的结论是，伽马辐射有助于增强 PLA 和 PANI NPs 之间的界面相互作用，从而进一步改善纳米纤维的所需性能，如润湿性、导电性和拉伸强度。