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cell density, calculated by equation (2), also decreased from 10.67 × 10 5 cell/cm 3 to 1.09 × 10 5 cell/cm 3 with an increase in both the blowing temperature and the content of CBA, respectively. These results are attributed to the well-dispersed MWNTs, which act as a nucleation agent, facilitating the cell formation process, namely, heterogeneous nucleation could be achieved at the interfaces between MWNTs and PBS. Also, the average cell size and cell density were strongly influenced by the gas evolution as a result of the thermal decomposition of CBA. The mean cell-wall thickness, based on equation (3), also decreased in proportion to increased CBA content, which was attributed to cell growth in accordance with foam expansion to adjacent cells. We measured the cell size of nanocomposite foams from optical micrographs and evaluated the distribution of the cell size, as shown in Figure 8. All foams showed an approximate Gaussian distribution. Moreover, it can be seen that the lower the blowing temperature was, the narrower the width of the distribution peaks was. The narrow peak indicates the high uniformity of cell size, which is significantly related to the dispersion state of the MWNTs as well as the applied blowing temperature. 17
Figure 9 illustrates the variation of the blowing ratio in accordance with blowing temperature, time, and CBA amount. It is seen that the blowing ratio, which is calculated by equation (1), tends to increase steadily as the blowing time, temperature and CBA loading are increased. The maximum values of the blowing ratio at different CBA loading are ranged from 7.3 to 11.1, indicating that more addition of CBA in the nanocomposite melt results in the release of more gases to nanocomposite, and facilitates increased cell size. 18
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 and 22: epresent the mass fraction of MWNTs
Page 23 and 24: The foam density was measured by a
Page 25 and 26: compared with Figure 2c. Therefore,
Page 27 and 28: decreased slightly but increased gr
Page 29: 3. 5. Foam behaviors and cell geome
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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