Abstract
The dilute solution properties of polysulphone A have been investigated by viscometry and light scattering; the Mark-Houwink expression in dimethylformamide at 25° is [η](cm 3 g −1) = 0·033 M w 0·64 . The values of the unperturbed dimensions, solvent-polymer interaction parameters and conformational parameter have been computed by applying the SFB theory. The conformational parameter is close to unity, in agreement with results for other polymers containing paraphenylene linkages in the main chain.
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