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Synthesis and Evaluation of Antistatic Nanocoating Properties on Polymer Substrates

Ghapanvari, Sara | 2024

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 57518 (07)
  4. University: Sharif University of Technology
  5. Department: Materials Science and Engineering
  6. Advisor(s): Dolati, Abolghasem
  7. Abstract:
  8. In this research, silica-based antistatic nanocoatings were prepared by sol-gel method and applied on polycarbonate substrate by immersion coating method, and their electrical and mechanical properties were investigated. Hybrid Sol was prepared by dehydration and condensation reaction of tetraethyl orthosilicate (TEOS) and 3-glycidoxypropyltrimethoxysilane (GPTMS) in the vicinity of acid catalyst and ethylenediamine (ED) as a curing agent. Quaternary ammonium silane was used as an antistatic agent, and 3-aminopropyltriethoxysilane (APTES) primer was used to increase the adhesion of the coating on the polycarbonate substrate. In order to investigate the effect of changing the quaternary ammonium silane concentration in the coating, solutions with different concentrations were prepared and coated. Also, the effect of relative humidity, time, wear, washing on the amount of antistatic properties of the coating was investigated. The various properties of the created coatings were measured and analyzed by FTIR tests, FESEM microscope images, EDX analysis, contact angle test, pencil hardness test, dust resistance, two-pin resistivity test, and spectrophotometer. The presence of quaternary ammonium groups (R4N+) and the formation of a hybrid structure were observed by FTIR analysis. From examining the images of the coatings by FESEM microscope at two magnifications of 20000 and 60000, it was found that after adding quaternary ammonium silane and ethylene diamine to GPTMS-SiO2, the coating has a compact structure, without defects and cracks, with a uniform distribution of nanoparticles. The electrical resistance of the polycarbonate substrate increased from 1016 Ω.cm (polycarbonate substrate without coating) to 1.57 ×1010 Ω.cm in the optimal value, and the results of the contact angle, the hydrophilicity of the coating and the reduction of the contact angle from 87 to 36 in the effect showed an increase in quaternary ammonium concentration. According to the results of adhesion, dust resistance, cross-sectional images and transparency of the coating, it can be seen that after applying the primer to the polycarbonate substrate, the coatings showed good wear resistance. There are no cracks or gaps, indicating good adhesion of the coating to the substrate, and the thickness of the coating was above 100 nm. The coatings showed high transparency in the visible light region, and in addition, the dust removal performance was improved with the antistatic coating, which achieved the best dust removal effect of 64%
  9. Keywords:
  10. Anti-static Coating ; Sol-Gel Method ; Glycidoxypropyltrimethoxisilane ; Antidust ; Hybrid Coatings ; Quaternary Ammonium Silane

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