By Karlheinz Hill, Wolfgang von Rybinski, Gerhard Stoll
Alkyl polyglycosides are a brand new iteration of multi-application, ecologically secure nonionic surfactants that shape a evidently reusable source. Written by means of pioneers within the box, this name info the technological, ecological, physicochemical and function facets of alkyl polyglycosides, and discusses the present patent state of affairs of those new commercially possible fabrics.
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Extra resources for Alkyl Polyglycosides: Technology, Properties, and Applications
1 Alkyl polyglycoside determination by GC The GC technique which has proven to be particularly suitable for the analysis of alkyl mono- and oligoglycosides is high temperature gas chromatography (HTGC). HTGC uses temperatures of up to 400 "C which enables oligomeric alkyl polyglycosides up to the very high boiling heptaglycosides to be analyzed. The hydroxyl groups in alkyl polyglycosides have to be converted into silyl ethers before analysis to prevent sample decomposition. 4 ml of MSTA (N-methylN-trimethylsilyltrifluoroacetamide)as the silylating agent for about 30 mg of sample.
Concentration at the break in the interfacial tension/concentration curves cbin three different oil/water systerns as a function of the alkyl chain length of the surfactant n at 60 "C [221 I 8 12 10 n 14 Figure 22. Plateau values of the interfacial tension y, in three different oil/water systems as a function of the alkyl chain length of the surfactant n at 60°C [221 water system has a pronounced minimum in the case of C,,G, and increases steeply with increasing alkyl chain length. Since C,,G, is highly oil-soluble in the octyl dodecanol/water system, optimum affinity for the oil phase in this system is actually achieved in the case of C,,G,.
The G’ values also increase with increasing temperature. The frequency behavior of the moduli G’ and G” correspond to a Maxwell liquid only in the isotropic phase. 51 Physicochemical Properties of Alkyl Polyglycosides Structure relaxation time T Is] G', G [Pal 10 20 30 40 50 60 Concentration [%I Figure 13. G' and G" values of CI2m APG at 1 Hz and 2 5 "C [21 10 20 30 40 50 60 Concentration [%I Figure 14. C,,,,, APG structure relaxation times at 25 "C [21 The structure relaxation times are shown in Figure 14.