A number of different methods have been used in the preparation of substituted ammonium polyphosphates. Products produced in different ways always had the same unit cells, but the degree of crystallinity and texture of the products varied with the method of preparation. The most crystalline products were obtained by ion exchange of inorganic polyphosphates. Sorption was studied with amyl-, heptyl-, nonyl-, dodecyl- and cetyltrimethyl- ammonium and anilinium polyphosphates. A number of different sorbates were used. Ethanol and amyl alcohol were found to react with primary alkyl ammonium polyphosphates, the effect becoming considerable in the case of the system amyl alcohol/amyl ammonium polyphosphate. Anilinium polyphosphate was also found to react with ethanol. Such reaction tended to alter the sorptive capacity of the polyphosphates. In addition, the sorption of water, nitromethane and a number of hydrocarbons was studied. Normally, reaction did not occur with these sorbates. Thermodynanmic evidence was obtained for some of these systems and it was attempted to interpret such evidence qualitatively in terms of models. Cetyl trimethylammonium polyphosphate differed from the other sorbents, both in structure and its tendency to dissolve in the sorbates. Equilibrium was attained very slowly with this sorbent. Information has been obtained by X-ray measurements about changes in the unit cells of certain polyphosphates in equilibrium with varying pressures of sorbates. This has been discussed in terms of the extent of uptake of such vapours, as determined by sorption measurements.
| Identifer | oai:union.ndltd.org:bl.uk/oai:ethos.bl.uk:602243 |
| Date | January 1963 |
| Creators | Locke, Timothy John |
| Publisher | Imperial College London |
| Source Sets | Ethos UK |
| Detected Language | English |
| Type | Electronic Thesis or Dissertation |
| Source | http://hdl.handle.net/10044/1/13389 |
Page generated in 0.0013 seconds