18959-30-3, Name is 4,5-Difluorophthalic Anhydride, belongs to benzofurans compound, is a common compound. HPLC of Formula: C8H2F2O3In an article, once mentioned the new application about 18959-30-3.
To investigate the effect of reactive end-capping groups on film-forming quality and processability, a series of molecular weight-controlled aromatic poly(amic acid) (PAA) resins functionalized with phenylethynyl end groups were prepared via the polycondensation of 3,3?,4,4?-biphenyltetracarboxylic dianhydride (BPDA), para-phenylenediamine (PDA), and 4-phenylethynyl phthalic anhydride (PEPA) served as molecular-weight-controlling and reactive end capping agent. The PAA resins with relatively high concentrations endow enhanced wetting/spreading ability to form PAA gel films by solution-cast method which were thermally converted to the fully-cured polyimide (PI) films. The mechanical and thermal properties of PI films were investigated as a function of PAA molecular weights (Mn) and thermal-curing parameters. Mechanical property, dimensional stability and heat resistance of the fully-cured PI films with PAA Mn > 20 ×103 g mol?1 are found to be better than that of their unreactive phthalic end-capped counterparts. The covalent incorporation of chain-extension structures in the backbones, induced by thermal curing of phenylethynyl groups, might facilitate yielding a higher degree of polymer chain order and consequently improved resistance strength and elongation at break to tensile plastic deformation.
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Reference：
Benzofuran – Wikipedia,
Benzofuran | C8H2983O – PubChem