Application of 18959-30-3, Chemistry is the experimental science by definition. We want to make observations to prove hypothesis. For this purpose, we perform experiments in the lab. 18959-30-3, Name is 4,5-Difluorophthalic Anhydride,introducing its new discovery.
Dual crosslinked phenylethynyl end-capped sulfonated polyimides via the ethynyl and sulfonate groups promoted by PEG
Typically, phenylethynyl (PE) end-capped oligomides require a temperature of 370 C for 1 h to develop a crosslinked system. A published method using poly(ethylene glycol)s (DM-PEG-250 and PEG-400) as cosolvents with NMP was effective in crosslinking the ethynyl end-caps at 250 C/3 h in nonsulfonated oligomides. The application of this novel crosslinked method to PE end-capped sulfonated oligomides was effective but caused a secondary crosslinked network via the sulfonic acid groups and ethylene glycol solvents. The solid-state 13C NMR spectral data on 13C-labeled end-caps in the PE-3F-SPI-3 oligomide provide evidence for the ethynyl to ethynyl and ethylene oxide sulfonate ester dual crosslinked structure. Infrared spectroscopy of model compounds also provides evidence for the presence of crosslinked sulfonate ester and appended sulfonate ester side chains. 13C NMR also provided quantitative data on the extent of the ethynyl to ethynyl crosslinking reaction and sulfonate ester crosslinks and side chains.
We¡¯ll also look at important developments in the pharmaceutical industry because understanding organic chemistry is important in understanding health, medicine, the role of 18959-30-3, and how the biochemistry of the body works.Application of 18959-30-3
Reference£º
Benzofuran – Wikipedia,
Benzofuran | C8H2929O – PubChem