02031nam a2200277Ia 4500 MX-MdCICY 20260521091049.0 CICY B-7705 Synthesis and Characterization of Aromatic Polyamides Containing Alkylphthalimido Pendent Groups Journal of Polymer Science: Part A: Polymer Chemistry, 40, p.3711-3724, 2002 A series of polyisophthalamides containing pendent phthalimido groups and flexible side spacers were prepared from four novel diacids and three commercial aromatic diamines. These polyamides were prepared in high yields and with high molecular weights by direct polycondensation with triphenyl phosphite and pyridine as condensing agents. The weight-average and number-average molecular weights, measured by gel permeation chromatography, were 70,000-137,000 and 47,000-86,000 g/mol, respectively. The novel polyamides were amorphous and readily soluble and showed glass-transition temperatures of 150-240 °C, as measured by differential scanning calorimetry. Thermogravimetric analysis showed that the 10 weight-loss temperatures in nitrogen were 355-430 °C, a significant improvement in thermal stability having been observed with the increase in the side-chain length. A theoretical quantum mechanical study was successfully carried out to explain these results. Flexible and tough films, cast from polymer solutions, showed tensile strengths of 50-125 MPa. POLYAMIDES STEP-GROWTH POLYMERIZATION THERMAL PROPERTIES STRUCTUREPROPERTY RELATIONS QUANTUM MECHANICAL CALCULATIONS Ferrero, E. Espeso, J. F. De La Campa, J. G. De Abajo, J. Lozano, A. E. https://drive.google.com/file/d/1oYzhKtJzKeMtuKmmaWlENV3020kxyKjh/view?usp=drivesdk Para ver el documento ingresa a Google con tu cuenta: @cicy.edu.mx Loc REF1 250602s9999 xx |||||s2 |||| ||und|d 17967 17967 0 0 Loc 0 0 F1 CICY CICY RE 2025-06-25 0 B-7705 2025-06-25 12:47:06 2025-06-25 REF1