Vv. Evreinov et al., FUNCTIONALITY-TYPE DISTRIBUTION IN BRANCH ED POLYESTERS CONTAINING HYDROXY-GROUPS - CHROMATOGRAPHIC STUDY, Vysokomolekularnye soedinenia. Seria A, 37(12), 1995, pp. 2076-2080
Four types of branched polyesters based on adipic acid, diethylene gly
col and trimethylolpropane, pentaerythritol, or glycerol, or on diethy
lene glycol, dimethyl adipate, and trimethylolpropane were fractionate
d with respect to functionality types (the number and type of end grou
ps) using HPLC under the critical conditions (in the vicinity of the c
oil-adsorbed coil transition). A serial Zorbax-Sil Golden column with
ethyl acetate-tetrahydrofuran as a binary solvent was used. Under the
critical conditions macromolecules are not fractionated with respect t
o size, and the chromatorgams gave knowledge directly on the relative
content of linear and branched functional molecules with different num
bers of end groups. A universal chromatographic procedure for analyzin
g the functionality-type distribution that is invariant with respect t
o molecular mass distribution, was proposed.