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4. Conclusions Poly(butylene succinate) (PBS)/MWNTs nanocomposites were successfully fabricated by three different methods. Via Raman scattering, we observed two characteristic absorption peaks attributed to MWNT-OH in the nanocomposites, and verified successful formation of nanocomposites based on MWNT-OH. The morphology and dispersion state of the MWNTs in the polymer domain were examined by SEM and TEM, respectively. The results suggested that the nanocomposite prepared by the SOAM method exhibited more dispersed MWNTs and stronger interfacial force with PBS than the nanocomposites fabricated by means of solution blending and melt mixing, respectively. The thermal stability was measured by TGA, and it was found that the thermal stability was enhanced by about 25 o C relative to neat PBS (Td = 331.89 o C). Double melting endotherms, which were attributable to a recrystallization process, were observed in neat PBS and nanocomposites based on MWNTs. In addition, MWNTs also impeded the crystallization behavior of nanocomposites, as revealed by DSC measurements. The ranking of high tensile mechanical property of nanocomposites is the SOAM method, melt 19
mixing, and solution blending. Furthermore, the nanocomposite with 2 wt% MWNTs content showed the highest tensile strength and elongation at break. Based on the properties of the nanocomposite described above, we assumed that the nanocomposite containing 2 wt% MWNTs produced via the SOAM method would be optimal for the high performance foam. Well-dispersed MWNTs, which act as a nucleation site for cell formation, induced an increase in the melt viscosity of the nanocomposite to restrain cell rupture. As a result, we achieved nanocomposite foams (>153 μm) with a closed-cell structure by means of the decomposition of CBA. The morphological parameters such as the post-foam density, average cell size, cell density, mean cell-wall thickness, and blowing ratio were significantly affected by the blowing time, temperature, and CBA content, respectively. 20
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: Figure 9 illustrates the variation
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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