단열재 사용을 위한 폴리우레아 실리카 에어로겔 복합체 제조

다국어 초록 (Multilingual Abstract)

Silica aerogel has good properties for applying various industrial fields. However, the fragility of silica aerogel is one of the biggest obstacles. To solve this problem, this study manufactures polyurea silica aerogel composites through the pore restoration method. The solvents used for the pore restoration were n-hexane, ethanol, and acetone. The drying temperature was different for each solvent because of difference of boiling point of solvents. The sample with 9 wt% silica aerogel, 70 ℃ drying temperature, and n-hexane solvent for pore restoration showed the lowest thermal conductivity, 45.5 mW/m∙K. Thermal stability of polyurea silica aerogel composites was improved when n-hexane was used to pore restoration. To investigate structure of polyurea, density of the composites, morphology, thermal conductivity, and thermal stability, Fourier transform infrared spectroscopy (FT-IR), pycnometer, hydrometer, scanning electron microscopy (SEM), thermal conductivity analyzer, thermogravimetric analysis (TGA) were used.

목차 (Table of Contents)

• List of Tables ⅱ
• List of Figures ⅲ
• Abstract 1
• Introduction 2
• Experiment 5
• Results and discussions 7
• Conclusions 27
• References 28