Cloudy polyols

It was observed experimentally that if the EO addition rate is high (in fact a high ethoxylation pressure), cloudy polyols and low primary hydroxyl content are formed [51]. The explanation of this behaviour is that if the rate of EO addition is too high, the equilibrium of alcohol - alcoholate does not have enough time to get established and the polyethylene oxide chains grow on a limited number of hydroxyl groups. As an immediate... 

The synthesis of block copolymers PO-EO with a terminal poly[EO] block is practically impossible, cloudy polyols always being formed, with a very low ethoxylation rate. The formation of cloudy polyols is because of an unfavourable (nonuniform) distribution of... 

A mixture of the above diol, PHBA, p-TSA and "Aromatic 150" was heated under N2 in a 3-neck flask equipped with stirrer, Dean-Stark trap, condenser and thermometer. The PHBA/diol wt. ratio varied from 20/80 to 60/A0 0.2 wt. % of p-TSA was used. About 10 wt. % of "Aromatic 150" was used the amount was adjusted to maintain the temperature at 230 +/- 3°. Distillate (cloudy H2O) was collected in the Dean-Stark trap during 9 to 11 hr. The reaction mass was cooled to 115°, and MIBK was added to yield a solution (20/80 PHBA/ diol ratio) or dispersion (other PHBA/diol ratios) of the crude polyol. 

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