Terraza, C. A., Cruz, Y., Rodríguez, A., Velázquez‐Tundidor, M. V., Hauyon, R. A., Rodríguez‐González, F. E., Niebla, V., Aguilar-Vega, M., Sulub-Sulub, R., Coll, D., Ortiz, P. A., Pérez, Y. P., Comesaña-Gándara, B. & Tundidor‐Camba, A. (2022). New polyimides containing methyl benzamidobenzoate or dimethyl benzamidoisophthalate as bulky pendant groups. Effects on solubility, thermal and gas transport properties. Journal of Applied Polymer Science, 139(42), e53036. https://doi.org/10.1002/app.53036
Abstract: This work reports the synthesis of six new polyimides obtained by the reaction of two novel diamine monomers: methyl 4-(3,5-diaminobenzamido)benzoate and dimethyl 5-(3,5-diaminobenzamido)isophthalate, bearing one or two methyl ester groups in their phenyl rings, respectively, with three known dianhydrides, 4,4′-(hexafluoroisopropylidene) diphatalic anhydride (6FDA), 4,4′-(dimethylsilanediyl) dipthalic anhydride (SiDA) and 4,4′-oxydiphthalic anhydride (ODPA). The polyimides were synthesized using the “two-step” method, which first involves forming a poly(amic acid) precursor that is subsequently cyclodehydrated to form the imide linkage. The yields were higher than 95% in all cases, and the structural characterization was performed by spectroscopic techniques like FT-IR, 1H, 13C, and 29Si NMR. In addition, the effect on the solubility in common organic solvents and thermal and gas transport properties of these polyimides were studied as a function of the nature of the respective side group and the dianhydride used.
Pablo Ortiz
pablo.ortiz@umayor.cl
