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논문 기본 정보
- 자료유형
- 학위논문
- 저자정보
- 지도교수
- 임호선
- 발행연도
- 2022
- 저작권
- 숙명여자대학교 논문은 저작권에 의해 보호받습니다.
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초록· 키워드
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Self-Healing (Self / Autonomic Repairing) is a property of materials that automatically heals from all types of damage. Research on self-healable materials have been shifted from extrinsic to intrinsic self-healing. In extrinsic self-healing methods, the healing agents flow out from tubes or capsules which are embedded in the polymer matrix, and fill the crack surfaces. However, the repetitive self-healing is not possible when the healing agents in tubes or capsules are consumed completely, so the intrinsic self-healing methods are in the spotlight because it could re-form the bonds repetitively between crack surfaces. Thus, in this study, we have developed a thermoplastic polyurethane (TPU) that is intrinsically healed due to multiple hydrogen bonding and a disulfide metathesis. The prepared thermoplastic polyurethane contains ureido-pyrimidinone and aromatic disulfide moieties. Each moiety acts as supramolecular interaction and dynamic covalent bond, and each of mechanisms contribute to the improvement of mechanical property and self-healing efficiency respectively. The results demonstrated that the mechanical properties of the polymer were maximized when the ratio of disulfide bond and quadruple hydrogen bond was 3 to 7 (TPU-S3U7), and the self-healing efficiency was improved by adding the disulfide bonding monomers. This self-healing TPU can be used in a variety of areas such as surface protective coatings, medical materials and wearable sensors. Also, by using the shape memory effect and spooling effect, it could be applicated to smart technologies such as smart textiles, smart medical implants, and smart robotics.
목차
Ⅰ. INTRODUCTION = 1Ⅱ. EXPERIMENTAL = 71. Materials = 72. Preparation of quadruple hydrogen bonding monomer = 81) Synthesis of Ureidopyrimidinone (UPy) monomer (a) = 82) Synthesis of IPDI-UPy-IPDI monomer (b) = 93. Preparation of self-healing TPUs = 101) Synthesis of TPUs = 104. Characterizations = 131) Fourier-transform infrared spectroscopy (FT-IR) = 132) 1H nuclear magenetic resonance spectroscopy (1H NMR) = 133) Gel permeation chromatography (GPC) = 134) Differential scanning calorimetry (DSC) = 145) Scratch self-healing test = 146) Tensile test = 14Ⅲ. RESULTS AND DISCUSSIONS = 161. Preparation of quadruple hydrogen bonding monomers = 161) Synthesis and characterization of UPy monomer (a) = 162) Synthesis and characterization of IPDI-UPy-IPDI monomer (b) = 182. Preparation of self-healing TPUs = 201) Synthesis and characterizations of self-healing TPUs = 203. Thermal analysis = 244. Gel permeation chromatography = 255. Mechanical properties = 276. Self-healing performance = 311) Tensile test = 312) Cutting and Contacting = 353) Scratch self-healing test = 377. Application = 391) Shape memory effect = 392) Spooling effect = 41Ⅳ. CONCLUSION = 44Ⅴ. REFERENCES = 45
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