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Diels-alder trapping of photochemically generated o-quinodimethane intermediates: an alternative route to photocured polymer film development
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Meador, Mary Ann B. Ilhan, Faysal Meador, Michael A. Scheiman, Daniel A. Tyson, Daniel S. Smith, Dee Dee |
| Copyright Year | 2004 |
| Description | Photolysis of o-methylphenyl ketones generates bis-o-quinodimethane intermediates that can be trapped in situ by dienophiles through Diels-Alder cycloadditions. This well-known photochemical process is applied to a series of six new photoreactive monomers containing bis-(o-methylphenyl ketone) functionalities combined with diacrylate and triacrylate ester monomers for the development of acrylic ester copolymer blends. Irradiation of cyclohexanone solutions of the bis-(o-methylphenyl ketone)s and acrylate esters produce thin polymer films. Solid state 13C NMR data indicated 47- 100% reaction of the bis-(o-methylphenyl ketone)s, depending on experimental conditions, to yield the desired products. DSC and TGA analyses were performed to determine the glass transition temperature, T,, and onset of decomposition, Td, of the resulting polymer films. A statistical Design of Experiments approach was used to obtain a systematic understanding of the effects of experimental variables on the extent of polymerization and the final polymer properties. |
| File Size | 2857823 |
| Page Count | 28 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_20050198873 |
| Archival Resource Key | ark:/13960/t0ns5qc23 |
| Language | English |
| Publisher Date | 2004-01-01 |
| Access Restriction | Open |
| Subject Keyword | Inorganic, Organic And Physical Chemistry Thin Films Acrylates Diels-alder Reactions Trapping Photochemical Reactions Ketones Acrylic Resins Thermogravimetry Polymerization Experiment Design Nuclear Magnetic Resonance Glass Transition Temperature Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Article |
