The development of polymers that can spontaneously repair themselves after mechanical damage would significantly improve the safety, lifetime, energy efficiency and environmental impact of man-made materials. Most approaches to self-healing materials require the input of external energy, healing agents, solvent or plasticizer. Despite intense research in this area, the synthesis of a stiff material with intrinsic self-healing ability remains a key challenge. Through the concept of multiphase design, supramolecular thermoplastic elastomers that combine high modulus and toughness with spontaneous healing capability are synthesized, resulting from the microphase separation of rigid, high glass transition (Tg) polymer component and flexible, low Tg polymer component bearing amide hydrogen bonding self-healing motifs. In contrast to previous self-healing polymers, this new system spontaneously self-heals as a single-component solid material at ambient conditions, without the need of any external stimulus, healing agent, plasticizer or solvent. This approach has opened the door to prepare a new class of self-healing materials. I have synthesized a series of self-healing materials with a variety of macromolecular architectures, including core-shell nanoparticles, brush copolymers and block copolymers. This microphase-separated self-healing system allows us to manipulate the macromolecular architecture to control the mechanical and self-healing properties of polymer materials.
|Commitee:||Guan, Zhibin, Nowick, James, Overman, Larry|
|School:||University of California, Irvine|
|Department:||Chemistry - Ph.D.|
|School Location:||United States -- California|
|Source:||DAI-B 74/05(E), Dissertation Abstracts International|
|Subjects:||Molecular chemistry, Organic chemistry|
|Keywords:||Mechanical properties, Microphase separation, Polymers, Self-healing materials, Thermoplastic elastomers|
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