Chemistry is traditionally divided into organic and inorganic chemistry. Quality Control of 4,5-Difluorophthalic Anhydride, The former is the study of compounds containing at least one carbon-hydrogen bonds.In a patent，Which mentioned a new discovery about 18959-30-3
A series of phenylethynyl-terminated oligoimides based on 2,3,3?,4?-biphenyltetracarboxylic dianhydride (a-BPDA), 2,2?-bis(trifluoromethyl)benzidine (TFDB), and bis(p-aminophenoxy)dimethyl silane (APDS) with different siloxane content and various calculated molecular weights were synthesized. The effect of siloxane structure on the processability of oligoimides and the thermal stability of cured polyimides (PIs) was investigated. The results indicated that the oligoimides have lower melt viscosity and broader processing window with the incorporation of flexible siloxane segment. The thermal stability of the cured PIs can be significantly enhanced by high-temperature postcuring due to the oxidative cross-linking of siloxane. The polyimide PI-s1-15 exhibited good balance between processability and thermal stability with the minimum melt viscosity of 0.4 Pa·s at 325C and glass transition temperature as high as 470C after postcuring at 450C. The carbon fiber-reinforced composite T800/PI-s1-15 displayed excellent high-temperature performance, which gave the flexural strength and interlaminar shear strength of 703 and 33 MPa, respectively, when tested at the temperature as high as 450C.
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Reference：
Benzofuran – Wikipedia,
Benzofuran | C8H2953O – PubChem