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Electrically Conductive Fibers and Films Based on PLA and Nano PANI

Ashraf, Sajad | 2019

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 51626 (06)
  4. University: Sharif University of Technology
  5. Department: Chemical and Petroleum Engineering
  6. Advisor(s): Frounchi, Masoud; Dadbin, Susan
  7. Abstract:
  8. Nowadays, the use of processed conductive polymers for conducting matrix polymers, as well as improving other properties for planting in the body, is very common. In this project, the fabrication and identification of electrically conductive films and fibers from biocompatible poly lactic acid and conductive polyAniline polymer in the form of nano-fibers or nanoparticles was intended. These fibers and films have been made in form of a plate or tube then, have been used as biosensors. These polymeric prostheses should be sterilized before planting in human body. Gamma rays are the best sterilization methods and are used at low doses (25 kGy) to sterilize plastic medical supplies. On the other hand, poly lactic acid which is widely used in biomedicine, is susceptible to gamma radiation degradation. In contrast, polyaniline has been reported to stabilize certain polymeric materials against gamma radiation. In this research, polyaniline nanoparticles were used to improve the polylactic acid 9%(w/v) properties. Initially, nanoparticles of polyaniline was prepared by standard methods then, Fourier transform infrared spectroscopy (FTIR) was hired to confirm the formation of polyaniline. The dynamic particle diffraction (DLS) test was used to achieve the mean particle size, which showed an average of 140 nm for polyaniline. Nanoparticles were used in preparation of films and fibers. To sterilize the fibers, gamma radiation was irradiated. In order to observe the surface of the films and fibers, also changes in the surface of the fibers after Gamma radiation the Field-Emission Scanning Electron Microscopes (FE-SEM) images were used. This test confirmed the decrease in fibers diameter due to the presence of polyaniline and the accumulation of fibers after radiation. The conductivity of all specimens was checked by an electrical conductivity device. as expected, samples containing polyaniline showed up to 105 times higher conductivity. Using the differential scan callorimetry (DSC), it was determined that the presence of polyaniline nanoparticles leads to an increase in enthalpy. Also, the enthalpy of the irradiated fibers was reduced, but the upward trend was maintained due to the presence of polyaniline. Tensile test was used to investigate mechanical properties. All samples with polyaniline nanoparticles exhibited higher stress tolerance. Irradiated fibers also resulted in higher tension. The contact angle test (CA) was used to determine the wettability of the fibers surface, which showed that the fibers containing nano-particles of poly-aniline had initially reduced the wettability and then increased the wettability. Also, all of the irradiated fibers showed higher wettability
  9. Keywords:
  10. Nanofiber ; Nanopolianilin ; Polylactic Acid ; Electrical Conductivity ; Gamma Rays

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