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4. Conclusions Using a chemical blowing agent, PBS/CNFs nanocomposite foams with a closed-cell structure and high blowing ratio was successfully obtained. It was found that to produce the high performance- nanocomposite foams, the optimal CNFs content was 2 wt%, and the SOAM method was an effective way to disperse the CNFs in the PBS matrix based on the enhancement of thermal and mechanical properties for the nanocomposites. In foaming process, when the decomposition of CBA occurred in a nanocomposite melt, well- dispersed CNFs acted as the efficient nucleation sites in the PBS matrix-CNFs interface. Nanocomposite foams exhibited the oval-shape and the homogeneous closed-cell structures without any ruptures. A high blowing ratio of about 12 was obtained at 170 ºC for 30 min, as well as a uniform cell size distribution of nanocomposite foams observed. 39
5. References [1] D. Klempner and K. C. Frisch, Handbook of polymeric foams and foam technology, Hanser Publishers, Munich, Vienna (1991) [2] L. James Lee, C. Zeng, X. Cao, X. Han, J. Shen, and G. Xu, Compos. Sci. Technol. 65, 2344 (2005) [3] T. Fugimaki, Polym. Degrad. Stabil. 59, 209 (1998) [4] K. P. de Jong and J. W. Geus, Catal. Rev.-Sci. Eng. 42, 481 (2000) [5] K. Lozano and E. V. Barrera, J. Appl. Polym. Sci. 79, 125 (2001) [6] K. Lozano, J. Bonilla-Rios, and E. V. Barrera, J. Appl. Polym. Sci. 80, 1162 (2001) [7] K. Lozano, S. Yang, and Q. Zeng, J. Appl. Polym. Sci. 93, 155 (2004) [8] Y. K. Choi, K. Sugimoto, S. M. Song, Y. Gotoh, Y. Ohkoshi, and M. Endo, Carbon 43, 2199 (2005) [9] S. K. Lim, E. H. Lee, and I. Chin, J. Mater. Res. 23, 1168 (2008) [10] R. B. McClurg, Chem. Eng. Sci. 59, 5779 (2004) [11] J. Shen, C. Zeng, and L. James Lee, Polymer 46, 5218 (2005) [12] S. K. Lim, S. G. Jang, S. I. Lee, K. H. Lee, and I. Chin, Macromol. 40
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 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: 3 the density of neat PBS (1.268 g/
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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