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Preparation and Characterization of Composites Based on Natural Fibers

Bapiri, Pardis | 2024

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 57345 (06)
  4. University: Sharif University of Technology
  5. Department: Computer Engineering
  6. Advisor(s): Shojaei, Akbar; Esfandeh, Masoud; Rezadoust, Amir Masoud
  7. Abstract:
  8. In this research, coating with polymer solution was considered for improve the surface adhesion of natural jute fibers with polymer matrix. This coating was performed by two polymers, polyurethane and polystyrene, in order to create compatibility between natural fibers and unsaturated polyester resin. Impregnation and coating of fibers were done by dissolving these polymers in a suitable solvent and creating a thin coating on the fibers. 2%, 5% and 10% solutions of each polymer were prepared for impregnating fibers and the pultrusion process of the resulting fibers was performed using unsaturated polyester resin. The polyurethane were not compatible with jute fibers and caused a loss of properties, and as the percentage of polyurethane in the solution increased, the loss of properties became more intense. The samples coated with polystyrene showed better properties in the bending test, ILSS and Shore D hardness, and the SEM images confirmed this improvement. The best obtained sample was PST5 sample (jute fiber modified with 5% polystyrene solution in toluene), which showed an 8% increase in flexural strength and a 12% increase in ILSS and Shore D hardness. Also, the tensile modulus and tensile strength showed an increase of 145% and 56.5%, respectively, in the tensile test against the perpendicular direction of PST5 fibers. Various mechanical properties decreased with the increase of styrene percentage, and this indicates the existence of an optimal amount for polymer coating. Considering that in the longitudinal direction, fibers play a more important role compared to the properties of the interface, surface modification did not show a significant effect in this direction. But in all cases, the coating increased the water absorption of the pultruded samples due to the formation of small holes during baking
  9. Keywords:
  10. Natural Fiber ; Surface Modification ; Polymer Coating ; Unsaturated Polyesters ; Kenaf Fiber ; Surface Functionality

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