DC Field | Value | Language |
---|---|---|
dc.contributor.advisor | Kim, Taek-Soo | - |
dc.contributor.advisor | 김택수 | - |
dc.contributor.author | Ahn, Kwang Ho | - |
dc.date.accessioned | 2019-08-28T02:43:07Z | - |
dc.date.available | 2019-08-28T02:43:07Z | - |
dc.date.issued | 2019 | - |
dc.identifier.uri | http://library.kaist.ac.kr/search/detail/view.do?bibCtrlNo=843043&flag=dissertation | en_US |
dc.identifier.uri | http://hdl.handle.net/10203/265843 | - |
dc.description | 학위논문(석사) - 한국과학기술원 : 기계공학과, 2019.2,[iii, 25 p. :] | - |
dc.description.abstract | Nafion is a Teflon(PTFE) based polymer which is characterized by a good separation between hydrophobic domain (back bone) and hydrophilic domain (ionic cluster). High conductivity to cations and water of Nafion. Nafion is being used to electrolyte or ionomer binder of electrode in PEMFC (Proton Exchange Membrane Fuel Cell), IPMC (Ionic Polymer Metal Composite) actuator, and bio-sensor. However, it is commonly occurred the lack of performance and durability due to differences in behavior between the Nafion thin film and adjacent materials in long range operating cycles. In previous studies, however, experiments were conducted on various substrates, and behaviors of Nafion film are effected greatly type of substrate as their thickness decreases. Thus, in this study, the test is quantitative measurement that the effect of the substrate is eliminated by conducting an assessment on water. As the thickness decreased under 60nm, Nafion is constructed from the ion group dominant structure to back bone dominant structure, resulting in increased thermal expansion at low temperature and Young’s modulus, decreased α-transition temperature, elongation at break, and tensile strength. Hydration growth as the thickness decreases causes mechanical properties to weak. However, Young’s modulus in hydrated state was increased as thickness decrease because confinement effect of backbone is more dominant. | - |
dc.language | eng | - |
dc.publisher | 한국과학기술원 | - |
dc.subject | Nafion▼athin film▼athermal behavior▼amechanical behaviors▼afuel cell▼areliability | - |
dc.subject | 나피온▼a박막▼a열적 거동▼a기계적 거동▼a연료전지▼a신뢰성 | - |
dc.title | Thermal and Mechanical Behaviors of Nafion Thin Film in Hydrated State | - |
dc.title.alternative | 수화 상태의 나피온 박막에 대한 열적, 기계적 거동 분석 | - |
dc.type | Thesis(Master) | - |
dc.identifier.CNRN | 325007 | - |
dc.description.department | 한국과학기술원 :기계공학과, | - |
dc.contributor.alternativeauthor | 안광호 | - |
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