| 학회 | 한국고분자학회 |
| 학술대회 | 2004년 가을 (10/08 ~ 10/09, 경북대학교) |
| 권호 | 29권 2호, p.133 |
| 발표분야 | 복합재료 |
| 제목 | Rheological Characterization of Multi-walled Carbon Nanotube and Poly(methylmethacrylate) Composite |
| 초록 | In this study, we prepared MWNT/poly(methyl methacrylate) (PMMA) nanocomposites with both a bulk type and a particulate type via a conventional in-situ bulk polymerization and a suspension polymerization, respectively, and then examined their rheological characteristics. Prior to use we purified the MWNT which was synthesized by a thermal chemical vapor deposition method, to eliminate impurities such as metallic catalysts. Purity of the pristine MWNT was 97 %, and it was treated in 3M HNO3 at 60 oC for 12 h, followed by a reflux process in 5 M HCl at 120 oC for 6 h with stirring 1. At first, the acid-treated MWNT was dispersed in a liquid state of methyl methacrylate (MMA) monomer. An ultrasound was then applied to the MWNT dispersion using an ultrasonic generator. Polymerizations of MMA and MWNT/MMA dispersion were conducted using 2,2-azobisisobutyronitrile (AIBN) as an initiator in capped glass test tubes at 65 oC. After in situ bulk polymerization, the MWNT/PMMA composites were characterized by a Fourier transform infrared spectrometer. A scanning electron microscopy and a gel permeation chromatograph were adopted to characterize the molecular weight of the PMMAs in a tetrahydrofuran solution. We also used a rotational rheometer with a parallel-plate geometry to measure the shear viscosity in molten state 2. On the other hand, MWNT and MMA were synthesized via a suspension polymerization using poly(vinyl alcohol) as a surfactant. The deionized water containing ammonium peroxydisulfate was added later through dropping, with continuous stirring and ultrasonication for 24 h at 20 oC. The MWNT/PMMA composites were separated three times by centrifugation. An ER fluid was prepared by suspending MWNT/PMMA particles in an insulating silicone oil, and its electrorheological property was examined under an applied DC electric field. The flow curves of MWNT/PMMA particles based ER fluid was measured by a rotational rheometer equipped with a high DC voltage generator 3. Reference 1. X. H. Chen, C. S. Chen, Q. Chen, F. Q. Cheng, G. Zhang, Z. Z. Chen, Mater. Lett. 57, 734 (2002). 2. S. J. Park, M. S. Cho, S. T. Lim, H. J. Choi, M. S. Jhon, Macromol. Rapid Commun. 24, 1070 (2003). 3. M. S. Cho, Y. H. Cho, H. J. Choi, M. S. Jhon, Langmuir 19, 5875 (2003). |
| 저자 | 박승준, 최형진, 김성태 |
| 소속 | 인하대 |
| 키워드 | carbon nanotube; in situ polymerization; suspension polymerization |
