《Synthesis of an oligomeric thickener for supercritical carbon dioxide and its properties》 was written by Zhou, Ming; Tu, Hongjun; He, Yinglan; Peng, Pengao; Liao, Mao; Zhang, Jinfeng; Xu, Xiaoxia; He, Wanying; Zhao, Yaxiong; Guo, Xiao. COA of Formula: C3H9NO2 And the article was included in Journal of Molecular Liquids in 2020. The article conveys some information:
The applications of supercritical CO2 as a solvent are limited by its very low viscosity. A four-armed oligomeric CO2 thickener containing fluorine 1,6-bis(1,3-perfluorooctanoic acid biester-2-Urea)Hexane (BPFAUH) was synthesized with 2-amino-1,3-propanediol, (Boc)2D, pentadecafluorooctanoic acid, thionyl chloride, hexamethylene-1,6-diisocyanate (HMDI) as crude materials by using amino protection, esterification, deprotection, and nucleophilic addition reaction. and characterized using FTIR, 13C NMR and elemental anal. TG anal. showed that the oligomeric thickener was thermally stable below 473.15 K. Its solubility in CO2 correlated well with the pressure. The viscosity of the system increased with increasing thickener concentration, but the viscosity of the thickener decreased with increasing temperature and shear rate. The system viscosity reached 19.2 mPa·s, a 480-fold increase compared to the initial viscosity, when 2.0 wt% thickener was added; this increase greatly exceeds that of other reported thickeners. The CO2-philic fluorocarbon groups promoted the solubility of the thickener; while intra-mol. thickener crosslinking occurred via O···H bonds. Thus, the mol. with four fluorocarbon groups and two urea groups formed a network structure to achieve superstrong CO2-thickening ability. In the experiment, the researchers used 2-Aminopropane-1,3-diol(cas: 534-03-2COA of Formula: C3H9NO2)
2-Aminopropane-1,3-diol(cas: 534-03-2) belongs to anime. Primary amines having a tertiary alkyl group (R3CNH2) are difficult to prepare with most methods but are made industrially by the Ritter reaction. In this method a tertiary alcohol reacts with hydrogen cyanide (HCN) in the presence of a concentrated strong acid; a formamide, RNH―CHO, is formed first, which then undergoes hydrolysis.COA of Formula: C3H9NO2
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