Showing papers by "Xihua Du published in 2018"
TL;DR: In this paper, density functional theory calculations have been performed to investigate the properties of metal-doped covalent organic frameworks and their interactions with the SO2 gas molecule, and it is found that a single metal atom (including Li, Na, K, and Sc) doped at the top of phenyls within the tetra(4-dihydroxyborylphenyl) silane (TBPS) building block can easily lose its valence electrons and can be positively charged.
Abstract: Covalent organic frameworks are unique for their highly open architecture and attractive for use as promising gas adsorption and storage carriers. In this work, density functional theory calculations have been performed to investigate the properties of metal-doped covalent organic frameworks and their interactions with the SO2 gas molecule. It is found that a single metal atom (including Li, Na, K, and Sc) doped at the top of phenyls within the tetra(4-dihydroxyborylphenyl) silane (TBPS) building block of covalent organic frameworks can easily lose its valence electrons and can be positively charged. The SO2 gas molecule could be stably absorbed onto the metal-doped covalent organic frameworks. The absorbed SO2 molecule interacts with Li, Na, K, and Sc metal-doped covalent organic frameworks by the dominant donor-acceptor delocalization between 1-center lone pair of an oxygen atom within SO2 and 1-center non-Lewis lone pairs of the doped metal atom.
5 citations
Patent•
24 Apr 2018
TL;DR: In this paper, a silicon-containing main chain aryl ether sulfone copolymers and a preparation method for their preparation was described. But the preparation method was not described.
Abstract: The invention relates to silicon-containing main chain aryl ether sulfone copolymers and a preparation method thereof, and belongs to the technical field of polymer materials The structural formula of the silicon-containing main chain aryl ether sulfone copolymers is as shown in the description According to the preparation method, 2,2'-bis(4-hydroxyphenyl)alkyl silane and other bisphenol monomers are used as main raw materials, and are subjected to a copolymerization reaction with 4,4-dichlorodiphenyl sulfone to obtain the silicon-containing main chain aryl ether sulfone copolymers A silanemain chain structure is introduced into the copolymers, so that melting and dissolving processabilities of a polyaryl ether sulfone resin are improved; and the copolymers have better thermal stability and film-forming property, and have a potential application value in the fields of functional coatings, separation membranes, and the likes
Patent•
18 Dec 2018
TL;DR: In this paper, a bonded fluorescent rare earth liquid crystal ionomer and a preparation method of graft copolymerization of a liquid crystal monomer is described. But the preparation method is simple, easy to operate, high yield and prone to industrialized production, and can have wide application prospect in optics, machinery, electronics, display and other fields.
Abstract: The invention discloses a bonded fluorescent rare earth liquid crystal ionomer and a preparation method thereof, and belongs to the technical field of polymer materials. The bonded fluorescent rare earth liquid crystal ionomer is prepared by graft copolymerization of a liquid crystal monomer 4-cholesterol allyloxy benzoate M1, acrylic acid M2, a rare earth complex M3 and polymethylhydrosiloxane PMHS. Compared with liquid crystal polymers, strong fluorescence appears at specific wavelength. Compared with common rare earth complexes, the prepared rare earth liquid crystal ionomer has liquid crystallinity and wide liquid crystal range, and has the liquid crystal range reaching 199 DEG C. In addition, through thermogravimetric analysis, the prepared rare earth liquid crystal ionomer has good heat stability, and can have wide application prospect in optics, machinery, electronics, display and other fields. The preparation method is simple, easy to operate, high in yield and prone to industrialized production.