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论文类型：期刊论文

发表时间：2017-04-19

发表刊物：ACS APPLIED MATERIALS & INTERFACES

收录刊物：SCIE、EI、Scopus

卷号：9

期号：15

页面范围：13201-13212

ISSN号：1944-8244

关键字：phthalazinone; covalent triazine framework; flexible and facile; substituents; gas adsorption and separation

摘要：Five porous ether-linked phthalazinone-based covalent triazine frameworks (PHCTFs) were successfully constructed via ionothermal polymerizations from flexible dicyano monomers containing asymmetric, twisted, and N-heterocyclic phthalazinone structure. All the building blocks could be easily prepared by simple and low-cost,aromatic nucleophilic substitution reactions, showing the large-scale application potential of thermal stable phthalazinone Structure in constructing porous materials. Generally, the flexible building blocks are avoided to prevent the networks from collapsing in constructing high surface area porous materials. Our experimental,results revealed that the introduction of the substituents can effectively decrease the probability of the network interpenetration from the longer struts and the intermolecular/intramolecular intercalation from the increased degree of conformation freedom in the flexible ether-linkage, the BET surface areas of PHCTFs increasing from 676 to 1270 m(2) g(-1). Meanwhile, the effects of introducing different sizes (methyl or phenyl group) and amounts (one or two) of substituents on the porosities of the target polymer networks were also investigated in detail. The high CO2 adsorption capacity of 10.3 wt % (273 K, 1 bar) can be ascribed to the strong affinity of the electron-rich N,O-containing networks with CO2. Excitingly, PHCTF-5 demonstrates the high CO2/N-2 selectivity up to 138 (273 K, 1 bar), according to the ideal adsorbed solution theory (LAST) for the higher proportion of V-micro accompanied the electron-rich heteroatoms characteristic. Such high CO2 adsorption capacity and good separation properties are superior to those of many other microporous organic polymers. These properties along with easily up-scalable synthesis make porous PHCTFs promising candidates applied in gas sorption and separation field.