70142-79-9Relevant academic research and scientific papers
Syntheses, Structures and Sorption Properties of Three Isoreticular Trinuclear Indium-Based Amide-Functionalized Metal–Organic Frameworks
Zhang, Zong-Hui,Wang, Qian,Xue, Dong-Xu,Bai, Junfeng
, p. 3603 - 3610 (2019)
Amide-functionalized metal–organic frameworks (AFMOFs) as a subclass of MOF materials have received great interest recently because of their intriguing structures and diverse potential applications. In this work, solvothermal reactions between indium nitrate and two mixed-linkers afforded two new isoreticular 8-connected trinuclear indium-based AFMOFs of [(In3O)(OH)(L2)2(IN)2]?(solv)x (2-In) and [(In3O)(OH)(L2)2(AIN)2]?(solv)x (NH2-2-In) (H2L2=4,4′-(carbonylimino)dibenzoic acid and HIN=isonicotinic acid or HAIN=3-aminoisonicotinic acid), respectively. Moreover, by means of reticular chemistry, an extended network of [(In3O)(OH)(L3)2(PB)2]?(solv)x (3-In) (H2L3=4,4′-(terephthaloylbis(azanediyl))dibenzoic acid, HPB=4-(4-pyridyl)benzoic acid) was also successfully realized after prolongation of the former dicarboxylate linker and HIN, resulting in a truly 8-connected isoreticular AFMOF platform. These frameworks were structurally determined by single-crystal X-ray diffraction (SCXRD). Sorption studies further demonstrate that 2-In and NH2-2-In exhibit not only high surface areas and pore volumes but also relatively high carbon capture capabilities (the CO2 uptakes reach 60.0 and 75.5 cm3 g?1 at 298 K and 760 torr, respectively) due to the presences of amide and/or amine functional groups. The selectivity of CO2/N2 and CO2/CH4 calculated by IAST are 10.18 and 12.43, 4.20 and 4.23 for 2-In and NH2-2-In, respectively, which were additionally evaluated by mixed-gases dynamic breakthrough experiments. In addition, high-pressure gas sorption measurements show that both materials could take up moderate amounts of natural gas.
Poly(amide-ether) Thermoplastic Elastomers Based on Monodisperse Aromatic Amide Hard Segments as Shape-Memory and Moisture-Responsive Materials
Shibasaki, Yuji,Mori, Toshiki,Fujimori, Atsuhiro,Jikei, Mitsutoshi,Sawada, Hideo,Oishi, Yoshiyuki
, p. 9430 - 9441 (2018)
A series of high-molecular-weight (Mn up to 29000) multiblock poly(N-methylbenzamide)-b-poly(ethylene glycol) polymers [poly(MABx-x-b-PEG)], utilizing monodisperse telechelic aromatic N-methylbenzamide-based molecules (MABx-x) (molar mass distribution Mw/Mn = 1.02-1.04) with H2N-PEG-NH2, were successfully prepared via conventional solution polycondensation; their shape-memory and moisture-responsive properties were thoroughly investigated. The resultant multiblock copolymers showed three thermal transitions: the glass transition (Tg) and melting (Tm) of the PEG segment at -35 and 55 °C, respectively, and Tg of the MABx-x segment at 215 °C. Hard opaque pale-yellow films were successfully prepared using the solution-cast method, and several films showed good shape-memory properties, i.e., a shape fixity of 91% and a shape recovery of 97%. These properties were only observed for multiblock copolymer films having both crystalline PEG (degrees of crystallinity from 34.8% to 43.7% were observed) and aggregated monodisperse MABx-x phases. The existence of this cocrystalline structure is critical for the retention of temporary shape at ambient temperature and the recovery of original shape above Tm for the PEG phase in the copolymer film. Upon soaking the film in water for 5 days, it swelled by ≈660 vol % (590 wt %) with a density change from 1.15 to 1.02 g/cm3. Furthermore, we demonstrated that the film exhibits moisture-responsive behavior within just 10 s upon exposing only one of its surfaces to humid air.
