標題: | Synthesis and dielectric properties of polyimide-chain-end tethered polyhedral oligomeric silsesquioxane nanocomposites |
作者: | Leu, CM Reddy, GM Wei, KH Shu, CF 材料科學與工程學系 應用化學系 Department of Materials Science and Engineering Department of Applied Chemistry |
公開日期: | 3-六月-2003 |
摘要: | Nanoporous polyhedral oligomeric silsesquioxanes (POSS) containing amine groups (NH2-POSS) were reacted with poly(amic acid) having anhydride end groups to form porous POSS/polyimide nanocomposites. The van der Waals interaction between tethered POSS molecules is incompatible with the polar-polar interaction of imide segments, resulting in a self-assembled system of zigzag shaped cylinders or lamellas about 60 nm long and 5 nm wide, as determined by transmission electron microscopy. The incorporation of 2.5 mol % nanoporous POSS results in a reduction of the dielectric constant of the polyimide nanocomposite from 3.40 for the pure polyimide to 3.09 without any degradation in mechanical strength. |
URI: | http://dx.doi.org/10.1021/cm0208408 http://hdl.handle.net/11536/27796 |
ISSN: | 0897-4756 |
DOI: | 10.1021/cm0208408 |
期刊: | CHEMISTRY OF MATERIALS |
Volume: | 15 |
Issue: | 11 |
起始頁: | 2261 |
結束頁: | 2265 |
顯示於類別: | 期刊論文 |