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surface morphology of the nanocomposites was observed by field emission scanning electron microscopy using a S-4300 (Hitachi, Japan). The samples were freeze-fractured in liquid nitrogen and sputter-coated with Pt. TEM observations were performed on a JEM 2100F (JEOL, Japan) operated at an accelerated voltage of 200 kV to examine the dispersion of MWNTs embedded in the PBS matrix. Ultrathin sections with a thickness of 50nm were microtomed using a MTX (RMC, Japan) with a diamond knife. A thermal analysis was conducted with a modulated DSC 2920 (TA Instruments, USA) in a nitrogen atmosphere at a heating rate of 10 o C/min. To erase the thermal history of the nanocomposite, a second heating scan was applied at temperatures ranging from 30 o C to 170 o C. Thermal stability was investigated out on a TGA Q50 (TA Instruments, USA). All samples were heated to 700 o C under air at a heating rate of 20 o C/min. Mechanical properties of the nanocomposites films under uniaxial elongation at room temperature were measured using a UTM (Hounsfield Test Equipment, UK). Each sample was provided as a dog-bone type and the resulting value was an average of at least seven measurements. 9
The foam density was measured by a gas pycnometer (Accupyc 1330, Micrometrics Co., USA). The blowing ratio was calculated using the following equation: 3 the density of neat PBS (1.268 g/cm ) ratio = the density of PBS/MWNTs nanocomposite foam (g/cm Blowing 3 The cross-sectional morphology of the expanded PBS nanocomposite foams was observed with an optical microscope (i-Camscope, Sometech, Korea). The average cell size d was estimated by measuring the maximum diameter of each cell perpendicular to the skin from an OM micrograph. To determine the cell size distribution, the size of at least 75 cells in the OM micrograph was measured. The cell density Nc and the mean wall thickness δ are given by [36] N c = 1- ( ρ / ρ ) 10 f −4 d 3 p and ⎟ ⎟ ⎛ ⎞ ⎜ 1 δ = d − 1 ⎜ ⎝ 1− ( ρf / ρ p ) ⎠ where ρp, ρf, and d are the pre-foamed density, the post-foamed density in g/cm 3 , and the average cell size in mm, respectively. 10 )
Page 1 and 2: 저작자표시-비영리-변경금
Page 3 and 4: 工學碩士學位論文 Pol
Page 5 and 6: Abstract Recently, due to the envir
Page 7 and 8: 국 문 요 약 최근 비분해성
Page 9 and 10: CONTENTS Abstract ……………
Page 11 and 12: SECTION I. LIST OF TABLES Table 1 M
Page 13 and 14: SECTION II. Figure 1 TGA thermogram
Page 15 and 16: matrix. However, CNTs are strongly
Page 17 and 18: efficiency of different particles,
Page 19 and 20: 2. 1. Materials 2. Experimental The
Page 21: epresent the mass fraction of MWNTs
Page 25 and 26: compared with Figure 2c. Therefore,
Page 27 and 28: decreased slightly but increased gr
Page 29 and 30: 3. 5. Foam behaviors and cell geome
Page 31 and 32: Figure 9 illustrates the variation
Page 33 and 34: mixing, and solution blending. Furt
Page 35 and 36: [11] Kannan Balasubramanian, Marko
Page 37 and 38: [28] Lakshmi S. Nair, Cato T. Laure
Page 39 and 40: SECTION II. Preparation and Charact
Page 41 and 42: chemical blowing agent, and to char
Page 43 and 44: vacuo at 60 ºC for 6 h to remove a
Page 45 and 46: were at least performed for each na
Page 47 and 48: nanocomposites enhanced greatly wit
Page 49 and 50: phr CBA loading was observed via op
Page 51 and 52: 3 the density of neat PBS (1.268 g/
Page 53 and 54: 5. References [1] D. Klempner and K
Page 55 and 56: SECTION I. Processing of Poly(butyl
Page 57 and 58: Table 2 Temperature and CBA content
Page 59 and 60: Figure 2 SEM images of the PBS nano
Page 61 and 62: Figure 4 DSC traces of the PBS nano
Page 63 and 64: Figure 6 Optical micrographs of PBS
Page 65 and 66: Figure 8 Blowing ratio of PBS nanoc
Page 67 and 68: Figure 2 The effect of CNFs content
Page 69 and 70: Figure 4 The effect of blowing time
Page 71: Figure 6 Cell size distribution of

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