4,4 -Biphenyldisulfonyl chloride

Disulfonyl Chlorides. 4,4 -Biphenyldisulfonyl chloride (BPDSC) is not commercially available in adequate purity for polymer work. Materials synthesized in this laboratory were used throughout. 

Physical Properties. The polymer structure of interest, arrived at after evaluating thoroughly various copolymer compositions, is derived from bisphenol-A, 4,4 -biphenyldisulfonyl chloride (BPDSC), and the mixed isomeric phthalyl chlorides (Figure 1). The composition and properties of this three-component copolymer can be varied over a wide range simply by varying the proportions of the three acid chlorides employed. 

The laboratory interfacial condensation of a mixture of iso- and terephthalyl chlorides and 4,4 -biphenyldisulfonyl chloride with bis-phenol A is best carried out with methylene chloride as the solvent, as shown in Table III. A surfactant is required, and the best found for our work was benzyltrimethylammonium chloride (BTAC) (Table IV). The detailed mechanism of this polycondensation was investigated and will be presented in a later publication. 

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