Abstract
A modification of the M athias-M ellor HBr fission/GLC method for determining the oxyethylene content of polyoxyethylene-polyoxypropylene copolymers is described, which eliminates arbitrary correction factors. The results are independent of molecular weight and oxyalkylene distribution of the materials and are within the limits of variation of commercial products, i.e., ± 1% at 50% oxyethylene and ± 0.1% at 3%. The reproducibility of replicate determination is normally better than this. Some of the disadvantages of infrared methods are also discussed.
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