Acetaldoxime, CH 3 CH: NOH, crystallizes in needles which melt at 47° C. On continued fusion the melting point gradually sinks to about 13° C., probably owing to conversion into a polymeric form.
The effect of chemical agents in producing coagulation are in consonance with what is known of other instances of polymeric or condensation changes, whilst the fact that the collection of globules separated by creaming after thorough washing, and therefore removal of all proteid, is susceptible of solidification into caoutchouc by a merely mechanical act such as churning, strongly supports the view that the character of the change is distinct from that of any alteration which may occur in the proteid constituents of the latex.
Although the acid is monobasic, salts of polymeric forms exist of the types (MP0 3) n, where n may be 1, 2, 3, 4, 6.
When kept for some time in sealed tubes it changes to a yellowish liquid, from which a yellow flocculent substance gradually separates, and finally it suddenly solidifies to a dark red mass, which appears to be a polymeric form.
A polymeric form of methacrylic acid has been described by F.
The substance investigated was acetaldehyde, C 2 H 4 O, in its relation to paraldehyde, a polymeric modification.
- Pelmatozoa in which radial polymeric symmetry of the theca is developed either not at all or not in complete correlation with the radial symmetry of the ambulacra (such as obtains in Blastoidea and Crinoidea); in which extensions of the food-grooves are exothecal or epithecal or both combined, but neither endothecal nor pierced by podia (as in some Edrioasteroidea).
Acetyland benzoyl-formaldoxime are derivatives of the threefold polymeric form.