| 학회 | 한국고분자학회 |
| 학술대회 | 2004년 가을 (10/08 ~ 10/09, 경북대학교) |
| 권호 | 29권 2호, p.558 |
| 발표분야 | 복합재료 |
| 제목 | Interlamellar incorporation of functionalized charged nanobeads into pristine sodium montmorillonite |
| 초록 | Many of the properties of polymer-clay nanocomposites are a function of the extent of dispersion of the individual clay platelets into a continuous polymer matrix as well as of the compatibility of the two intrinsically non-miscible materials 1-5. In current work incorporation of the charged polymer (PS) nanosized colloid beads into interlamellar gallery of pristine sodium montmorillonite via exfoliation-adsorption mechanism was studied in current work. The approach involves loading the clay gallery with preformed polymer nanosized colloid beads bearing a cationic functional group on its surface. In this way it is expected that incorporation of the nanosized particles will not only cardinally promote the expansion of the clay galleries but, what is particularly important, will be able to maintain the intercalated or exfoliated structure without substantial contraction of interlayer spacing even upon further melt processing. The strategy was aimed to achieve desired dispersion of clay sheets together with required compatibility of the components, promoted by the ion exchange of the sodium interlayer cation with a cationic part of organomodifier. A partial incorporation of polystyrene beads into clay gallery can be deduced from the WAXD (X-ray diffraction) patterns and TEM micrographs. The layered structure of the native silicate suffers disordered expansion induced by incorporation of the nanosize-ranged PS colloid beads. To further ascertain the mechanism of the adsorption of the PS nanoparticles into clay gallery, surface analysis was performed on PS latex–intercalated clay together with pristine sodium–montmorillonite and polystyrene latex alone used as references using XPS and SIMS. It was shown that the functionalized charged polymer (PS) nanobeads can be confined within interlamellar gallery of native sodium montmorillonite directly via exfoliation-adsorption mechanism. The confinement of the polymer beads between clay sheets allows dispersed silicate layers maintain their exfoliated state upon drying. It was suggested that the presence of polymer-clay interactions may play a crucial role in the confinement of the polymer nanosized beads between dispersed clay sheets. Fig. 1. Schematic diagram of clay exfoliation via incorporation of the PS nanobeads into pristine montmorillonite. References 1 Alexandre,M., Dubois, P. Polymer-layered silicate nanocomposites : preparation, properties and uses of a new class of materials / Mater. Sci. Eng., R Rep.28 (2000) 1-63 2 Yuqin Li, Hatsuo Ishida. Solution intercalation of polystyrene and the comparison with poly(ethyl methacrylate) / Polymer 44 (2003) 6571-6577 3 Marco Zanetti, Sergei Lomakin, Giovanni Camino. Polymer layered silicate nanocomposites / Macromol. Mater. Eng. 279 (2000) 1-9 4 Peter C. LeBaron, Zhen Wang, Thomas J. Pinnavaia. Polymer-layered silicate nanocomposites: an overview / Appl. Clay Sci. 15 (1999) 11-29 5 Christophe Tournassat, Alexander Neaman et al. Nanomorphology of montmorillonite particles: estimation of the clay edge sorption site density by low-pressure gas adsorption and AFM observations / Amer. Miner. 88 (2003) 1989-1995 |
| 저자 | Khvan Svetlana1, 이상수2, 김준경1 |
| 소속 | 1한국과학기술(연), 2고분자하이브리드연구센터 |
| 키워드 | polymer; sodium clay; nanocomposite; charged nanobead; surface characterization; incorporation; exfoliation-adsorption |
