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Preparation and Characterization of the Shape Memory Polymers and Polymeric Nanocomposites and Investigation of their Applications

Alipour Choob Basti, Sakineh | 2023

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  1. Type of Document: Ph.D. Dissertation
  2. Language: Farsi
  3. Document No: 56297 (03)
  4. University: Sharif University of Technology
  5. Department: Chemistry
  6. Advisor(s): Pourjavadi, Ali
  7. Abstract:
  8. The current research focuses on preparing conductive hydrogels with combined shape memory and actuating under the effect of external stimuli. Two studies were conducted in which hydrogels simultaneously showed shape memory and actuating behaviors. The magnetic carrageenan-based double network hydrogels were prepared in the first part. The presence of magnetic nanoparticles not only strengthened the mechanical properties, but also induced shape memory properties under a magnetic field. These hydrogels had good electrical conductivity and showed successful performance as strain sensors. The hydrogels performed well in simple and complex shape memory experiments in response to the temperature. In the second part of the research, single- and bilayer hydrogels based on polyvinyl alcohol were made, which showed good shape memory behavior in both single- and bilayer forms. These hydrogels were also electrical conductive in single-layer form and had self-healing properties, making them suitable for self-healing circuits. Temperature, electric field, salt solutions, and solvent were used to investigate shape memory and actuating properties. The samples were ideal in all cases. All hydrogels showed electrical conductivity without additional ions or other conductive materials
  9. Keywords:
  10. Hydrogel ; Shape Memory Polymers ; Actuators ; Strain Sensor ; Self Healing Hydrogel ; Conductive Hydrogels ; Magnetic Nanocomposite ; Self-Healing Circuits

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