Health & Environmental Research Online (HERO)


Print Feedback Export to File
7753225 
Journal Article 
Cyclic carbonates used in the synthesis of oligocarbonate diols involving step growth polymerization 
Rokicki, G; Piotrowska, A; Kowalczyk, T; Kozakiewicz, J 
2001 
1 
Polimery
ISSN: 0032-2725 
Industrial Chemistry Research Institute 
46 
7-8 
483-493 
Polish 
WOS:000170189300005 
The chemical structure of resulting oligocarbonate diols was studied in relation to catalyst type and experimental conditions of the polyesterification of propylene carbonate with 1,6-hexanediol or 1,10-decanediol (Table 1). Unlike ethylene carbonate, propylene carbonate employed as a source of carbonate linkages and n-hexane used as an azeotroping agent to entrain a 1,2-propane glycol by-product from the reaction medium, afforded products containing practically no polyether moieties. The structure of the resulting carbonate oligomers was studied by MALDI TOF mass spectrometry and 1H and 13C NMR spectroscopies (Figs. 1-9). Of the transesterification catalysts examined, viz., K2CO3, Bu2SnO and tin(II) stearate, Bu2SnO proved to be the best, providing the oligomers terminated exclusively with hydroxyl groups. Such oligomers can be used as polyols to make polyurethanes that are resistant to hydrolysis and oxidation. 
oligocarbonate diols; propylene carbonate; ethylene carbonate; 1,6-hexanediol; 1,10-decanediol; azeotropic agent; transesterification; catalysts