Publications
Detailed Information
A Study on Thermal Insulation Performance of Electrospun Fiber Mat Laden with Nano/Micro Particles : 마이크로/나노입자가 혼입된 전기 방사 섬유 단열성능 연구
DC Field | Value | Language |
---|---|---|
dc.contributor.advisor | 이우일 | - |
dc.contributor.author | 윤창기 | - |
dc.date.accessioned | 2018-11-12T00:54:16Z | - |
dc.date.available | 2018-11-12T00:54:16Z | - |
dc.date.issued | 2018-08 | - |
dc.identifier.other | 000000153158 | - |
dc.identifier.uri | https://hdl.handle.net/10371/143017 | - |
dc.description | 학위논문 (박사)-- 서울대학교 대학원 : 공과대학 기계항공공학부, 2018. 8. 이우일. | - |
dc.description.abstract | As the worldwide interest is focusing on the energy efficiency, the
insulation material and techniques which can reduce energy loss become rising. One of the effective method is using super insulation material. Super insulation material is an insulation material whose thermal conductivity is less than the air`s thermal conductivity (26mw/m∙K). The aerogel panel and vacuum insulation panel are the most popular super insulation material. Both materials have low thermal conductivity, but they are too expensive and the manufacturing process is complicate. Also the mechanical strength of materials is bad for in daily life. To substitute the existing super insulation material, we invested the new method for super insulation material and manufacturing process. ii New material is made with electrospinning method which can make micro-nano fiber with polymer. Using this polymer fiber as a bonding material, we tried to make micro-nano particle based super insulation material. The particles were glass hollow beads and silica aerogel. Both particles have low density and thermal conductivity, so they are used in many areas for insulation. The thermal conductivity of made with the glass hollow bead was about 31 mw/m∙K, but the silica aerogel had 22 mw/m∙K thermal conductivity.and, we tried thinner fiber which made with NaCl, and the fiber mat without particles had the 31 mw/m∙K. As the new super insulation material is made with polymer, so it is easy to burn. Therefore, the fire retardant used to protect the fibers from the flame. The thermal conductivity of the film was influenced little but when the fiber had the pores on the surface, the thermal conductivity was decreased than before. Also the resultant of TGA was increased. The mechanical property was tested with tensile stress. As the mat was made with fibers, so the all-round samples` tensile stress was pretty low. In the case of NaCl added the value was increased, on the other hand, when fire retardant added, the value was decreased drastically. Keywords : Electrospinning, micro-nano particle, Silica aerogel, PLA, Thermal conductivity, fire retardant | - |
dc.description.tableofcontents | Chapter 1. INTRODUCTION 1
1.1 Overview and problem description 1 1.2 Micro-nano scale particle and thermal insulation model . 7 1.2.1 Micro-nanoparticle 7 1.2.2 Knudsen effect 7 1.3 Research object . 10 Chapter 2. EXPERIMENT 12 2.1 Polymer . 12 2.1.1 Poly Lactic Acid (PLA) . 12 2.1.2 Ammonium Polyphosphate (APP) . 13 2.1.3 Preparation of polymer solution . 14 2.2 Process 15 2.2.1 Electrospinning 15 2.2.2 Metal pin 17 2.2.3 Motored sieve for suppling micro-nano particles. 18 2.2.4 Porous fiber 19 2.3 Measurement 22 2.3.1 Thermal conductivity 22 2.3.2 Thermal stability . 23 2.3.3 Tensile strength 24 2.3.4 Brunauer, Emmett and Teller (BET) Measurement 25 Chapter 3. PROPERTIES OF PLA FIBER/MICRONANOPARTICLE COMPOSITE MAT 27 3.1 shape change of fiber in relation to PLA concentration . 27 3.2 Comparison of insulation performance 32 3.3 Porous structure 33 3.4 Glass hollow beads . 35 3.5 Silica aerogel (SAG) . 41 3.6 Permanency of thermal insulation performance of fiber mat 45 3.7 Control of fiber thickness using NaCl 47 3.8 Flame retardancy of fiber mat using Ammonium polyphosphate 51 3.9 Tensile stress test of fiber mat 58 Chapter 4. PREDICTION SIMULATION OF THERMAL CONDUCTIVITY OF FIBER MAT 61 Chapter 5. CONCLUSION . 70 Reference . 73 | - |
dc.language.iso | en | - |
dc.publisher | 서울대학교 대학원 | - |
dc.subject.ddc | 621 | - |
dc.title | A Study on Thermal Insulation Performance of Electrospun Fiber Mat Laden with Nano/Micro Particles | - |
dc.title.alternative | 마이크로/나노입자가 혼입된 전기 방사 섬유 단열성능 연구 | - |
dc.type | Thesis | - |
dc.contributor.AlternativeAuthor | Chang Ki Yoon | - |
dc.description.degree | Doctor | - |
dc.contributor.affiliation | 공과대학 기계항공공학부 | - |
dc.date.awarded | 2018-08 | - |
- Appears in Collections:
Item View & Download Count
Items in S-Space are protected by copyright, with all rights reserved, unless otherwise indicated.