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Gamma irradiated electro-conductive polylactic acid/polyaniline nanofibers

Ashraf, S. S ; Sharif University of Technology | 2020

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  1. Type of Document: Article
  2. DOI: 10.1016/j.synthmet.2019.116204
  3. Publisher: Elsevier Ltd , 2020
  4. Abstract:
  5. 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. © 2019
  6. Keywords:
  7. Electroconductive ; Gamma ray ; Polyaniline nanoparticles ; Polylactic acid ; Wettability ; Electric conductivity ; Electrospinning ; Gamma rays ; Hydrophilicity ; Irradiation ; Morphology ; Nanoparticles ; Polyaniline ; Polyesters ; Polymeric implants ; Tensile strength ; Wetting ; Electrospinning process ; Electrospun nanofibers ; Interfacial interaction ; Mechanical and electrical properties ; Mechanical and thermal properties ; Poly lactic acid ; Nanofibers
  8. Source: Synthetic Metals ; Volume 259 , 2020
  9. URL: https://www.sciencedirect.com/science/article/abs/pii/S0379677919305235