TMEDA is tetramethyl ethylenediamine, a colorless liquid with a strong amine smell. It is miscible with water, alcohol and other organic solvents. It is prepared by refluxing formic acid, ethylenediamine and formaldehyde. It is a polar aprotic solvent. It is also used as an organic synthetic reagent for preparing alkenyl alkynes.
TIPS is a new method to prepare polymer microporous membrane, which was put forward by American A.J.Castro in 198 1, which means "thermally induced phase separation" in Chinese. Its technological process and principle are that the polymer is dissolved in a solvent with high boiling point and low volatility (also called diluent) higher than the melting point of the polymer to form a homogeneous solution. Then cool down. During the cooling process, phase separation will occur in the system.
This process is divided into two categories, one is solid-liquid phase separation (referred to as S-L phase separation) and the other is liquid-liquid phase separation (referred to as L-L phase separation). By controlling the appropriate process conditions, after phase separation, the system forms a two-phase structure with polymer as continuous phase and solvent as dispersed phase. At this time, a suitable volatile reagent (extractant) is selected to extract the solvent, so as to obtain a polymer microporous membrane with a certain structure and shape.
Extended data
Application of IBX:
IBX can be supported on silica gel or polystyrene. Compared with IBX, these polymers containing IBX have the advantages of simple separation, recyclable reagents, non-explosiveness, etc., and their oxidizability is similar to that of IBX, and satisfactory results can be obtained.
Dyce-Martin oxidant (DMP) was obtained by heating the mixed solution of IBX, acetic acid and acetic anhydride, which is easily soluble in common organic solvents and widely used. IBX often has similar properties to DMP in oxidation reaction, but DMP is unstable and cannot be stored for a long time.
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