Name: 2,5-DibromothiopheneIn 2020 ,《Novel Sulfur-Containing Cross-Linking Agent for Si-Based Preceramic Polymers》 was published in Macromolecular Chemistry and Physics. The article was written by Taheri, Poroshat; Bokka, Apparao; Asgari, Parham; Jeon, Junha; Lang, John C.; Campostrini, Renzo; Soraru, Gian Domenico; Kroll, Peter. The article contains the following contents:
Crosslinking polymethylhydrosiloxane (PMHS) with divinylthiophene (DVT) via hydrosilylation in highly dilute conditions and subsequent supercritical drying in CO2 yield a polymeric aerogel containing aromatic sulfur integrally and uniformly distributed throughout the monolith. Fourier-transform IR (FT-IR) spectroscopy indicates almost complete consumption of vinyl groups and Si-H bonds in the product. Both FT-IR and Raman spectroscopic analyses support loss of conjugation of vinyl groups with the retained double bonds of the thiophene ring. SEM indicates a condensed colloidal structure with characteristic particulate diameters of about 165 nm. SEM coupled with energy dispersive X-ray spectroscopy elemental mapping shows that sulfur is distributed homogeneously in the polymeric aerogel. Porosimetry of the mesoporous aerogel indicates the effective average pore diameters are about 12 nm. Thermogravimetric anal. (TGA) establishes greater thermal stability of the PMHS-DVT product than either of the pure unreacted components. TGA coupled with mass spectrometric (TG-MS) identification of the volatiles released during pyrolysis shows that sulfur is driven from the crosslinked polymer as thiophene and its derivatives Recorded mass spectra support the hypothesis that crosslinking DVT bridges between PMHS chains in the polymeric aerogel, and that this results in a more thermally stable monolith. The experimental part of the paper was very detailed, including the reaction process of 2,5-Dibromothiophene(cas: 3141-27-3Name: 2,5-Dibromothiophene)
2,5-Dibromothiophene(cas: 3141-27-3) , is mainly used as pharmaceutical intermediate and synthesis intermediate. 2,5-Dibromothiophene polymerizes by debromination with magnesium catalyzed by nickel compounds to form poly(2,5- thienylene) .Name: 2,5-Dibromothiophene
Referemce:
Bromide – Wikipedia,
bromide – Wiktionary