Novel poly(ether sulfone) with tetraphenyl bipyrimidine unit for gas separation was written by Han, Xiaocui;Jin, Sizhuo;Zhang, Jianrui;Yue, Cheng;Zhang, Haibo;Pang, Jinhui;Jiang, Zhenhua. And the article was included in Polymer in 2020.Category: pyridine-derivatives This article mentions the following:
A series of poly(ether sulfone) (PES) containing the tetra-Ph bipyrimidine unit (PES-TPhbpy-x) was prepared by nucleophilic polycondensation to improve the gas separation performance of PES. PES-TPhbpy-x exhibited a high mol. weight, excellent mech. properties, and could form robust membranes. With increasing TPhbpy unit content in PES-TPhbpy-x, the glass transition temperature and heat resistance increased. WAXD anal. revealed that the d-spacing of PES-TPhbpy-x is larger than that of PES. TPhbpy unit could hinder the polymer chain packing and enhance the rigidness of the polymers. Compared with PES, PES-TPhbpy-x exhibited an excellent gas separation performance. The CO2 permeability of the PES-TPhbpy-100 increased by 570%, and the CO2/N2 selectivity and CO2/CH4 selectivity increased by 49% and 50%, resp. PES-TPhbpy-100 could form a membrane by the hot-press method. The CO2 permeability of the PES-TPhbpy-100 membrane prepared by the hot-press method was 12.81 barrer. The CO2/N2 and CO2/CH4 selectivities were 32.0 and 37.7, which were 27% and 35% higher than those of the PES membrane, resp. In the experiment, the researchers used many compounds, for example, Pyridinehydrochloride (cas: 628-13-7Category: pyridine-derivatives).
Pyridinehydrochloride (cas: 628-13-7) belongs to pyridine derivatives. The pyridine ring occurs in many important compounds, including agrochemicals, pharmaceuticals, and vitamins. Pyridine, its benzo and pyridine-based compounds play diverse roles in organic chemistry. Pyridine-based materials are valued for their optical and physical properties as well as their medical potential. Category: pyridine-derivatives