One of the major reasons for studying chemical kinetics is to use measurements of the macroscopic properties of a system, Quality Control of 4,5-Difluorophthalic Anhydride, such as the rate of change in the concentration of reactants or products with time.In a article, mentioned the application of 18959-30-3, Name is 4,5-Difluorophthalic Anhydride, molecular formula is C8H2F2O3
A reactive diluent (ODA-PEPA) and a flexible phenylethynyl-terminated imide oligomer (PEI-PEPA) were designed and synthesized based on the 2,3,3?,4?-diphenyl ether tetracarboxylic acid dianhydride (a-ODPA), 3,4?-oxydianiline (3,4?-ODA), and 4-phenylethynylphthalic anhydride (PEPA). Solution blended systems with the addition of 5, 10, and 15 wt% ODA-PEPA to PEI-PEPA oligomer and their cured resin systems were prepared. Results showed that ODA-PEPA is semi-crystalline in nature. The Tg values of cured resins were improved from 273 C to 280 C by the addition of ODA-PEPA, due to the higher crosslink densities. In addition, rheological properties of blends showed lower melt viscosity and wider processing window, revealing improved melt processabilities for potential application in making advanced composites. The isothermal viscosity in 280 C of PEI-PEPA containing 15 wt% ODA-PEPA reactive diluent decreased by two thirds, due to the low molecular weight of ODA-PEPA. The cured blends demonstrated high thermal stability and heat resistance. 5 wt% thermal decomposition temperatures (Td5) of the cured blends were above 549 C and 547 C in N2 and air atmosphere, respectively. The char yield reported at 800 C in N2 atmosphere increased from 58.8% to 63.7 % with the addition of ODAPEPA. Meanwhile, the cured polyimides blends possessed good bond strength (> 9.3 MPa).
Sometimes chemists are able to propose two or more mechanisms that are consistent with the available data. Quality Control of 4,5-Difluorophthalic Anhydride, If a proposed mechanism predicts the wrong experimental rate law, however, the mechanism must be incorrect.Welcome to check out more blogs about 18959-30-3, in my other articles.
Reference：
Benzofuran – Wikipedia,
Benzofuran | C8H2981O – PubChem