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Synthesis and Investigation of Metal–Organic Framework (MOF) on Properties of Biocompatible Polyurethane Acrylate

Salavati, Ali | 2025

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 58036 (06)
  4. University: Sharif University of Technology
  5. Department: Chemical and Petroleum Engineering
  6. Advisor(s): Shojaei Segherlou, Akbar; Salkhi Khasraghi, Samaneh
  7. Abstract:
  8. The objective of this research is to evaluate different morphologies of UiO-66 structures (pristine state and UiO-66 structure chemically supported on graphene oxide (UiO-66@GO)), on the rheology of polyurethane acrylate nanocomposites prior to UV-curing. The synthesized nanoparticles were characterized by FTIR, FESEM, TGA, XRD, and BET analysis. Rheological investigations, including large amplitude oscillatory sweep, small amplitude oscillatory sweep, steady shear flow, and thixotropic analysis were utilized. Moreover, the obtained rheological results were fitted using the Carreau–Yasuda model, the power-law model, and the Herschel–Bulkley model for quantitative interpretations. The results confirmed a decrease in the linear viscoelastic region, significant increases in storage modulus, particularly at low frequencies, accompanied by superior complex viscosity, high apparent yield stress, and shear viscosity, marked shear-thinning, and thixotropic behavior in the nanocomposites, with increasing nanoparticle loading. Notably, these effects were stronger in nanocomposites containing UiO-66@GO nanoparticles, accompanied by a lower concentration of the percolated network (less than 1 wt%), compared to nanocomposites containing pristine UiO-66 (1-2 wt%). Observed differences confirm the existence of an interconnected nanoparticle network structure followed by a modified dispersion state of nanoparticles. Nanocomposites containing a percolated network, as confirmed by rheological investigations, were cured, and an enhanced dispersion state and superior mechanical behavior were observed after UV-curing
  9. Keywords:
  10. UiO-66 Hybrid Nanoparticles ; Metal-Organic Framework ; Acrylated Polyurethane ; Graphene Oxide ; Rheological Behavior ; Melt Rheological Response ; Low-Dimensional Particles ; Percolated Network Structure

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