Abstract
This work reports two series of structurally different aromatic polyimides based on 4,4´-diaminodiphenylmethane (DPM) and 4,4´-diaminotriphenylmethane (TPM) and three commercial dianhydrides. All TPM-based polyimides formed membranes due to their high molecular weight (inherent viscosities ~0.93–1.14 dl/g), they exhibited high thermal stability (5 %: 490–544 °C), glass transition temperatures between 269 and 293 °C, and reasonable mechanical properties. The incorporation of pendant phenyl moieties in the TPM-based polyimides has a strong effect producing an improvement in solubility, thermal stability, density and gas permeability coefficient in comparison with DPM-based polyimides. The most interesting polyimide TPM-6FDA, containing phenyl and trifluoromethyl as bulky pendant groups, showed higher gas permeability coefficient for CO2 (23.73 Barrer) and the best ideal selectivity to the gas pair CO2/CH4 (α = 28.93).
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Acknowledgments
The authors acknowledge the financial support of Programa de Apoyo a Proyectos de Investigación e Innovación Tecnológica (PAPIIT) through Grant IT101114/26; moreover, the partial support from grant 127499 SENER-CONACyT is gratefully acknowledge. Additional thanks are expressed to M.D. Damaris Cabrero for her technical assistance in the thermal analysis.
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Aguilar-Lugo, C., Santiago-García, J.L., Loría-Bastarrachea, M.I. et al. Synthesis, characterization, and structure-property relationships of aromatic polyimides containing 4,4′-diaminotriphenylmethane. J Polym Res 23, 49 (2016). https://doi.org/10.1007/s10965-016-0939-z
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DOI: https://doi.org/10.1007/s10965-016-0939-z