Effect of Temperature and Catalyst Concentration on Polyglycerol during Synthesis

Table 4

Model of glycerol polymerization growing chain containing linear, branched, and cyclic segments and their carbons assignments by ¹³C NMR (see also Scheme 1) [12, 14, 17].

Carbon type (  ^13C in ppm)
-CH2OH	-CHOH-	-CH2-O-	-CH-O-
60–64 ppm; Polyglycerol terminal units (primary hydroxyl groups)	68–73 ppm; pendant hydroxyl groups	72-73 ppm; polyether chains	74–82 ppm; branching
C-1, C-9, C-17′, C-27, and C-27′	C-2, C-6, C-16′, C-16′′, and C-26	C-3, C-5, C-7, C-9, C-13, C-15, C-13′, C-15′, C-17, C-19, C-19′, C-17′, C-23, C-25, C-15′′, C-26′, C-25′, and C-23′	C-10, C-12, C-20, and C-22