Tundidor-Camba, Alain;Tagle, Luis H.;Terraza, Claudio A.;Rivera, Jorge;Coll, Deysma;Ortiz, Pablo A. published 《Tri-functional oligomeric polyesters prepared from new dicarboxylic acids containing several amino acids residues by Higashi methodology: synthesis, characterization, and study of solubility and thermal behavior》 in 2021. The article was appeared in 《Polymer Bulletin (Heidelberg, Germany)》. They have made some progress in their research.COA of Formula: C31H20O8 The article mentions the following:

Abstract: The synthesis of polyfunctional aliphatic oligomeric polyesters (poly(ether-imido-esters); PEIEs) containing several amino acid residues is described, and their thermal properties and solubility behavior were studied. The new sym. monomeric dicarboxylic acids were synthesized using 4-nitrophthalonitrile as starting material, which reacted with bisphenol-A or bis(4-hydroxyphenyl)diphenylmethane. Then, the tetranitrile derivatives were hydrolyzed to the tetracarboxylic acids and dehydrated to the resp. dianhydrides. Finally, these compounds reacted with the amino acids glycine or L-alanine to obtain the aliphatic dicarboxylic acid monomers. PEIEs were obtained by Higashi methodol. from these monomers and bisphenol-A, characterized by elemental anal., NMR and IR, and the results were in agreement with the structures. The materials were soluble at 25°C in several aprotic polar organic solvents and some in CHCl₃ and THF. In agreement with the viscosity and SEC results, PEIEs were oligomers with d.p. of four and six, and Mw and Mn between 7370-9790 g/mol and 3680-4850 g/mol, resp. The samples showed low T_g values (124-160°C), associated with important structural flexibility promotes by dicarboxylic acid monomers. Despite this, this parameter depended of the aminoacidic residue nature in the sense that when the volume of it increased, the T_g also increased due to a decrease in the free rotation that neg. affects the segmental movements of the chains. This effect was also observed when the side groups of the diphenol moiety of the dicarboxylic acid monomers increase from Me to Ph. The recorded TDT_10% values from the TGA anal. (334-457°C) do not allow to consider these samples as thermoset materials. In this sense, it was possible to observe an average increase of 8-13°C and 23-28°C when the lateral group volume of the amino acid residues and of the diphenol moiety are increased, resp. And 5,5′-((Propane-2,2-diylbis(4,1-phenylene))bis(oxy))bis(isobenzofuran-1,3-dione) (cas: 38103-06-9) was used in the research process.

5,5′-((Propane-2,2-diylbis(4,1-phenylene))bis(oxy))bis(isobenzofuran-1,3-dione)(cas: 38103-06-9) is a diallyl based epoxy modification agent that blends with the resin to improve the mechanical property of the epoxy material.COA of Formula: C31H20O8 It is majorly used in novalac based resins, which can be further cured with bismaleimides (BMI) for aerospace, electronics and wireless communication based applications.

Reference:
Benzofuran – Wikipedia,
Benzofuran | C8H6O – PubChem