標題: | Binding effect of surface-modified cadmium sulfide on the microstructure of PS-b-PEO block copolymers |
作者: | Jeng, US Sun, YS Lee, HY Hsu, CH Liang, KS Yeh, SW Wei, KH 材料科學與工程學系 Department of Materials Science and Engineering |
公開日期: | 15-六月-2004 |
摘要: | CdS nanoparticles with surfaces modified by mercaptoethanol have been synthesized for greater solubility in dimethylformamide (DMF) and the ability to preferentially bind to the poly(ethylene oxide) (PEO) blocks of polystyrene-block-poly(ethylene oxide) (PS-b-PEO) copolymer. The size of the surface-modified CdS nanoparticles (M-CdS) in DMF can be characterized by the Schultz distribution of a mean radius of 18.4 Angstrom and a polydispersity of 0.5, using small-angle X-ray scattering (SAXS). These M-CdS nanoparticles can further disperse in the PS-b-PEO, with a slightly larger mean radius than that observed in DMF. The uptake of M-CdS nanoparticles for the PEO blocks of the PS-b-PEO saturates around 7% in volume fraction. The binding of the nanoparticles promotes a segregation of the PEO/nanoparticles and leads to spherical PEO/M-CdS microdomains in the composite film with a greatly enhanced thermal stability. The structural information obtained from X-ray scattering agrees well with the transmission electron microscopy images and differential scanning calorimetry results. |
URI: | http://dx.doi.org/10.1021/ma049722r http://hdl.handle.net/11536/26669 |
ISSN: | 0024-9297 |
DOI: | 10.1021/ma049722r |
期刊: | MACROMOLECULES |
Volume: | 37 |
Issue: | 12 |
起始頁: | 4617 |
結束頁: | 4622 |
顯示於類別: | 期刊論文 |