TY - JOUR
T1 - Thermal treatment of hydroxyl functionalized polytriazole and its effect on gas transport: From crosslinking to carbon molecular sieve
AU - Chisca, Stefan
AU - Bettahalli Narasimha, Murthy Srivatsa
AU - Musteata, Valentina-Elena
AU - Vasylevskyi, Serhii
AU - Hedhili, Mohamed N.
AU - Abou-Hamad, Edy
AU - Karunakaran, Madhavan
AU - Genduso, Giuseppe
AU - Nunes, Suzana Pereira
N1 - KAUST Repository Item: Exported on 2021-10-26
Acknowledgements: The authors thank King Abdullah University of Science and Technology (KAUST) for the financial support. The work was performed in the frame of a AMPM center-CCF grant. We thank the center for general discussions.
PY - 2021/10/22
Y1 - 2021/10/22
N2 - We propose hydroxyl-functionalized polytriazole as a precursor for the preparation of highly crosslinked membranes and carbon molecular sieves (CMS) for gas separation. We studied the effect of the treatment temperature on the chemical structure and gas separation properties. A progressing crosslinking structure was formed when polytriazole films were treated in the range of 300–400 °C. Above 425 °C, CMSs with multi-layered nitrogen-graphene-like structures were obtained. The CO2 permeability increased by increasing the temperature, while the CO2/CH4 selectivity was maintained. Permeability increases up to 37-fold compared to the untreated polymer film were obtained, aligned with a CO2/CH4 selectivity of 75. The single-gas CO2 permeability vs. CO2/CH4 selectivity data obtained for films treated at 475 and 550 °C are among the highest reported in the literature. Moreover, the mixed gas performance of these membranes is far above previously reported CO2/CH4 data plotted as mixed-gas trade-off curves, demonstrating the potential of polytriazole materials for these applications.
AB - We propose hydroxyl-functionalized polytriazole as a precursor for the preparation of highly crosslinked membranes and carbon molecular sieves (CMS) for gas separation. We studied the effect of the treatment temperature on the chemical structure and gas separation properties. A progressing crosslinking structure was formed when polytriazole films were treated in the range of 300–400 °C. Above 425 °C, CMSs with multi-layered nitrogen-graphene-like structures were obtained. The CO2 permeability increased by increasing the temperature, while the CO2/CH4 selectivity was maintained. Permeability increases up to 37-fold compared to the untreated polymer film were obtained, aligned with a CO2/CH4 selectivity of 75. The single-gas CO2 permeability vs. CO2/CH4 selectivity data obtained for films treated at 475 and 550 °C are among the highest reported in the literature. Moreover, the mixed gas performance of these membranes is far above previously reported CO2/CH4 data plotted as mixed-gas trade-off curves, demonstrating the potential of polytriazole materials for these applications.
UR - http://hdl.handle.net/10754/672945
UR - https://linkinghub.elsevier.com/retrieve/pii/S0376738821009066
U2 - 10.1016/j.memsci.2021.119963
DO - 10.1016/j.memsci.2021.119963
M3 - Article
SN - 0376-7388
VL - 642
SP - 119963
JO - Journal of Membrane Science
JF - Journal of Membrane Science
ER -