Oxyalkylene groups

An especially effective reduction of the Krafft Point results from the insertion of ether groups into the molecule of the anionic surfactant. In table I this is examplified with Na dodecyl sulfate and Na-tetra-decyl sulfate in comparison to various n-alkyl ether sulfates of the same chain length (10). As a measure of the Krafft Point, a temperature is deTined at which a 1 7o solution dissolves clearly. By the incorporation of oxyalkylene groups into the molecule, the Krafft -Point and the melting point are greatly depressed. This depression is especially effective if there is branching in the oxyalkylene groups. 

Fig. 9. Chemical structure of bismaleimides containing oxyalkylene groups...

Various workers have described methods for determining alkoxy groups based on thermal degradation of oxyalkylene groups to the corresponding olefin, which is determined by gas chromatography [66-68]. 

Ozonisation followed by reduction with lithium aluminium hydride to oxyalkylene groups has been used to study regioisomerism in polypropylene glycols. Adopting the following nomenclature for propylene glycol ... 

METHOD 60 - DETERMINATION OF OXYALKYLENE GROUPS IN POLYETHER BASES AND POLYURETHANE POLYMERS. MIXED ANHYDRIDE CLEAVAGE - GAS CHROMATOGRAPHY. ... 

Extensive ozonisation followed by LiALFl4 reduction of oxyalkylene groups in polypropylene glycols produces monomeric diglycols as shown opposite (6.20-6.22). 

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