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A Study on Thermal Insulation Performance of Electrospun Fiber Mat Laden with Nano/Micro Particles : 마이크로/나노입자가 혼입된 전기 방사 섬유 단열성능 연구
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- Authors
- Advisor
- 이우일
- Major
- 공과대학 기계항공공학부
- Issue Date
- 2018-08
- Publisher
- 서울대학교 대학원
- Description
- 학위논문 (박사)-- 서울대학교 대학원 : 공과대학 기계항공공학부, 2018. 8. 이우일.
- 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
- Language
- English
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