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At that conversion small molecules are entrapped in the polymer matrix and individual parts of these molecules have different mobility as may be detected by NMR. Bromal has recently been polymerized at low temperatures where its crystallization was avoided by judicious selection of solvent and temperature of polymerization. The tribromomethyl group of bromal is the largest side group of any monomer which has ever been polymerized. Dichlorobromoacetaldehyde and chlorodibromoacetaldehyde were synthesized and polymerized to what are completely insoluble and apparently isotactic polymers.

The infrared spectrum (KBr pellet) is in agreement with the proposed formula (Fig. 10). Copolymers of bromodichloroacetaldehyde with chloral and with phenylisocyanates have also been prepared and characterized (Table 4). Polydibromofluoroacetaldehyde. 25 Polymerization of difluorochloroacetaldehyde gave not only insoluble but also soluble polymer. Completely acetone soluble polymer was obtained with SbCl5 and with triphenylphosphine under certain conditions. In most other cases, polydifluorochloroacetaldehyde is either insoluble or a mixture of insoluble and soluble polymer.

The results of our investigation showed that one-half of the reactive sites could be acylated under our present reaction conditions. Additional work, perhaps the use of an acylating or an alkylating group as part of the counter cation, would be a more efficient way to carry out this reaction. B. Cationic polymerization Early work on the polymerization of chloral has shown that aluminum chloride and sulfuric acid can act as initiators. We carried out additional work in attempts to determine the scope of the cationic polymerization of chloral.

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