Glycerol, reaction with triacetate

Selection of the solvent was another problem. Since it was expected that a high viscosity would be required to invalidate TST in these reactions, three viscous liquids with different functional groups were chosen, namely, 2,4-dicyclohexyl-2-methylpentane (DCMP) as a non-polar solvent, glycerol triacetate (GTA) as a polar aprotic solvent, and 2-methylpentane-2,4-diol (MPD) as a protic solvent. All these solvents have a branched molecular structure and, therefore, the shear viscosity y increases much more rapidly with increasing pressure than in common solvents. The pressure effects on rj of MPD are shown in Fig. 3.3. As can be seen from this figure, the pressure dependence of rj could be approximately expressed by... 

Figure 3.9 Reaction of polyethers with p-toluene sulfonic acid - gas chromatography. Gas chromatogram of reaction products of polyurethane polyethers (1) propylene glycol diacetate (2) glycerol triacetate (3) trimethylpropane triacetate (4) triethylanolamine triacetate (5) pentaerythritol tetracetate. Gas chromatographic conditions column 1 m x 3 mm, coated with 15% FFAQ on Uniport B, oven 170 °C chart speed 1 cm/s. (b) Gas chromatogram of reaction products of polyurethane polyethers based on amines (1) pyropylene glycol diacetate (2) derivative from 1,2 diaminoethane (3) derivative from 2,2 -diaminodiethylamine. Gas chromatographic conditions Column 1 m x 3 mm packed with 15% SE-30 on Uniport B oven 230 "C chart speed, 1 cm/min.

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