Ethylene-imine ring, opening

The PEO salt complexes are generally prepared by direct interaction in solution for soluble systems or by immersion method, soaking the network cross-linked PEO in the appropriate salt solution [52-57]. Besides PEO, poly(propylene)oxide, poly(ethylene)suceinate, poly(epichlorohydrin), and polyethylene imine) have also been explored as base polymers for solid electrolytes [58]. Polyethylene imine) (PEI) is prepared by the ring-opening polymerization of 2-methyloxazoline. Solid solutions of PEI and Nal are obtained by dissolving both in acetonitrile (80 °C) followed by cooling to room temperature and solvent evaporation in vacuo. Polyethyleneimine-NaCF3S03 complexes have also been explored [59],... 

The investigations of Lucas and his coworkers with 2,3-disubstituted butanes have contributed much to the clarification of the mechanism of ring closure and ring opening of ethylene oxides and ethylene imines. D-Mreo-2,3-Butanediol (XV) is converted into a chlorohydrin (XVII) via the diacetate (XVI).24 In the formation of the chlorohydrin (XVII) a Walden inversion occurs.26 The dehydrochlorination of XVII with... 

Scheme I Synthesis of hyperbranched poly(ethylene imine) (PEI) via acid catalyzed ring-opening polymerization of aziridine. Each color represents a different branching unit blue for linear units (L), black for dendritic units (D), red for terminal units (T). PEI has a degree of branching (DB) of 62-73%, the depicted structure represents only a small idealized fragment. Reproduced with permission from [91]...

Poly(N-alkyl-ethylene imine) can be prepared by cationic ring-opening polymerization of N-alkylaziridines however, branched polymers are obtained by this way 19>. Linear poly-MEI may be obtained by N-methylation of linear PEI by the Clarke-Eschiweiler variation of the Leukart reaction, in which an excess of formic acid is used together with formaldehyde. The reaction may be performed either on PEI, or... 

The polymerization products of ethylene imine are known as polyimines. The ring-opening polymerization of ethylene imine can be initiated by acids HA or alkylating agents RX e.g.,... 

The polymer can be made into a branch structure by ring-opening polymerizing ethylene imine under an acidic catalyst. Also, a linear polymer can be made by hydrolyzing the poly(N-formylethylene imine) obtained by the ring-opening polymerization of 2-oxazoline with boron trifluoride or sulfuric acid. 

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