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An Investigation on the Role of Metal-Organic Framework (MOF) on the Network Structure and Physical/Mechanical Properties of EPDM Rubber

Abdi, Babak | 2021

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 54215 (06)
  4. University: Sharif University of Technology
  5. Department: Chemical and Petroleum Engineering
  6. Advisor(s): Molvai, Hossein
  7. Abstract:
  8. Ethylene-propylene-diene monomer rubber (EPDM) is one of the elastomers that shows non-polar behavior, high elasticity at low temperatures, excellent thermal and ozone resistance, and high electrical resistance. In this respect, it is used in various applications such as sealing materials, conveyor belts, waterproof materials, cables, etc. One of the most important applications of this rubber is its use as a sealing material. In this case, the resilience behavior plays an important role in the sealing behavior of the EPDM rubber. Especially in cases such as the car's hydraulic braking system where high service temperatures and dynamic stresses are applied, resilience behavior will be more important.
    The use of various vulcanization systems of the EPDM rubber, including sulfur and peroxide vulcanization system, is one of the important methods to control its network structure and resilience behavior. But the use of nanoparticles in the construction of this rubber is also one of the methods used today to control the network structure and the resilience behavior of the rubber.In this project, a special type of Metal-Organic-Framework (MOF) called UiO-66 was used to control the mechanical properties of EPDM rubber. MOFs are considered to be the newest synthetic nanoparticles that have a very porous structure and a high specific surface area. Therefore, the combination of this nanoparticle with EPDM rubber caused desirable properties. In this study, rubber additives along with 5 phr of nanoparticles and sulfur curing system were added to EPDM rubber using a two-roll-mill. First, the interaction of nanoparticles in the polymer matrix was investigated using SEM images. Then the density of cross-linking of the polymer formed in different samples was determined by immersion of the vulcanized samples in toluene solvent. Then, the vulcanization rheometric characteristics of the final samples were investigated using a vulcanization rheometer at 150 ° C. Finally, the mechanical properties of the composites were investigated with a tensile machine at ambient temperature.After reviewing the results obtained from different experiments, it was found that for samples without nanoparticles, the conventional vulcanization system showed the best mechanical and structural properties. In addition, it was observed that the greatest improvement in mechanical properties with the addition of nanoparticles also occurs in the conventional vulcanization system, where the tensile strength of the nanoparticle-free sample varies from 1.65 MPa to 2.79 MPa for the nanoparticle-containing sample. Also, the elongation at break varies from 202% for the sample without nanoparticles to 405% for the sample containing nanoparticles
  9. Keywords:
  10. UiO-66 Hybrid Nanoparticles ; Mechanical Properties ; Nanocomposite ; Ethylene-Propylene-Diene Monomer (EPDM)Rubber Particles ; Metal-Organic Framework ; Vulcanization

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