Cresol-formaldehyde resins are important components of photoresists for semiconductor fabrication. The type of methylene bridge and relative amounts thereof are key structural features that determine resin properties. Several model compounds were prepared that represent the various types of methylen
Determination of composition of mixed meta- and para-cresol/formaldehyde novolaks by 13C-NMR spectroscopy
โ Scribed by Edward A. Fitzgerald
- Publisher
- John Wiley and Sons
- Year
- 1990
- Tongue
- English
- Weight
- 172 KB
- Volume
- 41
- Category
- Article
- ISSN
- 0021-8995
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๐ SIMILAR VOLUMES
## Abstract ^13^C NMR spectroscopy was used to investigate the structures of a series of pure isomeric cresylic novolak resins. Chemical shifts were measured and assigned, and end groups were distinguished from the central repeat units of the chains. Based on these measurements, the number average
A comprehensive I3C-NMR method for the analysis of composition in the most common commercial polyethylene copolymers has been established. The method covers ethene copolymers with propene, butene-1, hexene-1, octene-1, and 4-methyl pentene-1 in the composition range of 1-10 mol %. The chemical shift