In heterogeneous catalysis, the catalyst is in a different phase from the reactants. Safety of 4,5-Difluorophthalic Anhydride, At least one of the reactants interacts with the solid surface in a physical process called adsorption in such a way. 18959-30-3, name is 4,5-Difluorophthalic Anhydride. In an article，Which mentioned a new discovery about 18959-30-3
Most of the existing polyimide oligomers for resin transfer molding (RTM) processing exhibited high melt viscosity, which can only maintain below 1 Pa·s at 280C for 2 h, leading to very high process temperatures. So novel RTM-type oligomers with lower and stable melt viscosities are more desirable. Three series of thermoset oligoimides derived from 1,4-bis(3,4-dicarboxy phenoxy)benzene dianhydride and three different aromatic diamines were prepared herein. The diamines included 4,4?-oxydianiline, 2,2?-bis(trifluoromethyl)benzidine (TFDB), and 2-phenyl-4,4?-diaminodiphenyl ether (p-ODA). 4-Phenylethynylphthalic anhydride was used as an endcapping reagent. Effects of the chemical structures and molecular weights of the oligoimides on their aggregated structures, melt processability, and the thermal and mechanical properties of the cured films were then systematically investigated. X-Ray diffraction results indicated that ODA series oligoimides and TFDB series oligoimides showed crystallinity in various degrees. However, the asymmetric p-ODA enables the p-ODA series oligoimides to exhibit amorphous forms. It was found that the p-ODA-based oligoimide with a molecular weight of 750 g mol?1 showed very low melt viscosity of 1 Pa·s even at 210C, and the melt viscosity could maintain below 1 Pa·s after isothermal aging for 2 h at any temperature in the range of 200?280C by rheological measurements. The cured film also showed a high glass transition temperature of 355C by dynamic mechanical analysis, very good thermal stability by thermogravimetric analysis, and good mechanical properties. It might be more suitable for RTM processes in the future.
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Reference：
Benzofuran – Wikipedia,
Benzofuran | C8H2971O – PubChem