In homogeneous catalysis, the catalyst is in the same phase as the reactant. The number of collisions between reactants and catalyst is at a maximum.In a patent, 18959-30-3, name is 4,5-Difluorophthalic Anhydride, introducing its new discovery. COA of Formula: C8H2F2O3
A series of oligomers based on the mixture of thioetherdiphthalic anhydride isomers and 4,4?-oxydianiline with 4-phenylethynylphthalic anhydride as reactive endcapping reagent were prepared. The calculated molecular weights were in the range of 1150-5070 g mol-1 with different degrees of polymerization (n = 1, 3, 5, 7, and 9). The effect of molecular weight of the aromatic oligomers on their processability and solubility as well as the thermal and mechanical properties of the thermal-cured polyimides (PIs) was systematically investigated. The typical oligomer (Oligo-1) could be melted at temperatures of 289-334C to yield stable molten fluid with melt viscosity below 1.0 Pa s. The melt viscosity of the oligomers increased with the increasing molecular weight. After thermally curing at 370C, the thermoset PIs exhibited good thermal properties. The glass transition temperatures of oligomers measured by differential scanning calorimetry were in the range of 286-326C, and the temperature of 5% weight loss was higher than 524C. The cured films also showed good mechanical properties with tensile strength above 72 MPa and modulus more than 2.5 GPa.
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.COA of Formula: C8H2F2O3
Reference：
Benzofuran – Wikipedia,
Benzofuran | C8H2967O – PubChem