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Synthesis and Characterization of Mechanical and Rheological Properties of Interpenetrating Polymer Network Nanocomposite Hydrogels using Nanostructures

Kheirabadi, Malihe | 2015

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  1. Type of Document: Ph.D. Dissertation
  2. Language: Farsi
  3. Document No: 47563 (48)
  4. University: Sharif University of Technology
  5. Department: Institute for Nanoscience and Nanotechnology
  6. Advisor(s): Bagheri, Reza; Kabiri, Kourosh; Pourjavadi, Ali
  7. Abstract:
  8. Hydrogels are kind of polymers that have ability of frequently applications in agriculture, hygienic, drug delivery and etc. suitable mechanical strength is one of the features of this material. If mechanical strength reduces, efficiency of hydrogels in variety of application will decrease. There are several ways for gel strength improvement, such as cyclic structure for example fumarates, surface crosslinking and preparation of interpenetrating polymer networks (IPNs). Making of nanocomposite structure in hydrogels, using nanostructures, can improve physical-mechanical properties, surprisingly. Therefore, combination of interpenetrating polymer network (IPN) and nanocomposite structures can improve mechanical properties of hydrogel. Nanocomposites polymers were synthesized with 1D nanostructures, for example organ-modification clay and graphene oxide, and 3D nanostructures, such as iron oxide nanoparticles. Then, IPN will be prepared with addition of secondary monomer to first structure. One of the purposes of this project is use of different methods for clay modifying and selecting of the best method (thermal or centrifuge) for intercalating of nanoclay. Also, in this project, three kinds of different IPN hydrogel, i.e. cationic (acrylic), anionic (acrylic) and natural (polysaccharide) will be synthesized and their properties, particularly structural, rheological, mechanical properties and their swelling capacity, in detail characterized. In the swelling studies was observed that anionic IPN nanocomposite hydrogel have acceptable mechanical strength (Young’s modulus of 800 kPa) and they also have water absorption capacity higher than 100 g/g. Mechanical results of anionic and cationic acrylic hydrogels indicate that mechanical strength was decreased with addition of more than 1% nanoclay to matrix. In the case of natural hydrogels (based on hyaluronic acid) was observed that hybrid hydrogel with iron oxide nanoparticles have the most storage modulus (~ 6000 Pa)
  9. Keywords:
  10. Nanocomposite ; Mechanical Properties ; Hydrogel ; Rheological Properties ; Interpenetrating Polymer Network

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