Spin-on Mesoporous Silica Films with Ultralow Dielectric Constants, Ordered Pore Structures, and Hydrophobic Surfaces

✍ Scribed by C. M. Yang; A. T. Cho; F. M. Pan; T. G. Tsai; K. J. Chao

• Publisher: John Wiley and Sons
• Year: 2001
• Tongue: English
• Weight: 191 KB
• Volume: 13
• Category: Article
• ISSN: 0935-9648
• DOI: 10.1002/1521-4095(200107)13:14<1099::aid-adma1099>3.0.co;2-0

✦ Synopsis

for 0.5 h. The monomers 2,8-dibromo-6,6,12,12-tetraoctylindenofluorene (1) (600 mg, 0.7 mmol) and 9,10-dibromoanthracene (2) (35 mg, 0.1 mmol), dissolved in 15 mL dry and degassed toluene, were added to the above solution and the polymerization maintained at 80 C for 3 days. After cooling, the workup procedure included several washing steps with HCl (aq) , ethylenediamine tetraacetate (aq) (EDTA) (aq) , and water, followed by repeated precipitation of a concentrated polymer solution into a methanol/acetone mixture. In order to remove the bromine end groups, the obtained dark-yellow solid was refluxed in a mixture of toluene and LiAlH 4 . After 2 days, the mixture was filtered, washed with water, and precipitated in methanol to afford the poly-2,8-(6,6,12,12-tetraoctylindenofluorene)-co-9,10-anthracenediyl (PIF-co-anthracene) (3) in reasonable yield (72 %).