Branched polyether with multiple primary hydroxyl groups: polymerization of 3-ethyl-3-hydroxymethyloxetane

Cationic Polymerization of 3‐Ethyl‐3‐hydroxymethyloxetane in an Ionic Liquid

“… e) Determined from the integration of 13 C NMR signals at δ = 42.6, 42.9, and 42.0 ppm corresponding to quaternary carbon atoms in:8b …”

“…The $\overline M _{\rm n}$ of the resulting polymer is relatively low and does not differ considerably from the $\overline M _{\rm n}$ values observed for bulk polymerization or polymerization in organic solvents (entries 1 and 2 in Table 1). 8b,e (It should be noted that reported $\overline M _{\rm n}$ values should be treated as relative rather than absolute values because the $\overline M _{\rm n}$ values for branched poly‐EOX were calculated using a calibration based on linear polystyrene.) In addition, the degree of branching, as determined on the basis of 13 C NMR spectra, is not different to that observed for bulk polymerization or polymerization in organic solvents 8b,e.…”

“…8b,e (It should be noted that reported $\overline M _{\rm n}$ values should be treated as relative rather than absolute values because the $\overline M _{\rm n}$ values for branched poly‐EOX were calculated using a calibration based on linear polystyrene.) In addition, the degree of branching, as determined on the basis of 13 C NMR spectra, is not different to that observed for bulk polymerization or polymerization in organic solvents 8b,e. MALDI TOF spectra of poly‐EOX obtained in ionic liquids are identical with those observed for bulk polymerization, which indicates that in those systems intermolecular chain transfer also leads to the formation of cyclic macromolecules, as discussed in detail in preceding papers 8e…”

Multihydroxyl branched polyethers by cationic copolymerization of hydroxymethyloxetanes: copolymerization of 3‐ethyl‐3‐(hydroxymethyl)oxetane with difunctional oxetane

“…The literature has examples of polymerization of cyclic ethers and other heterocyclic monomers substituted with hydroxyl groups, namely oxiranes,1–6 oxetanes,7–12 lactones13 or carbamates,14 leading to branched products. The best known is anionic polymerization of 2‐(hydroxymethyl)oxirane (glycidol) 1–4…”

Hyperverzweigte polymere ionische Flüssigkeiten mit zwiebelartiger Topologie als Transporter und kompartimentierte Systeme

“…Die in Schema 1 dargestellte ringçffnende kationische Polymerisation von 3-Ethyl-3-hydroxymethyloxetan erfolgt in Anlehnung an die von Bednarek et al berichtete Methode, [15] wobei hyperverzweigte Polyoxetane mit zahlenmittleren Molmassen von 1800-2400 g mol À1 , Polydispersitäten von 1.5-2 und Verzweigungsgraden von 50 % erhalten werden (detaillierte Informationen befinden sich in den Hintergrundinformationen). Anschließend werden die Hydroxygruppen tosyliert.…”