Abstract
Binary (B1) and ternary (B2) cluster integrals of deuterated polystyrene in deuterated cyclohexane were determined by small-angle X-ray scattering from semidilute solutions. The results were compared with those previously determined for the undeuterated polystyrene-deuterated cyclohexane system and undeuterated polystyrene-undeuterated cyclohexane system. It was found that for all cases B2 was unaltered by deuterium substitution within the experimental accuracy and had the value 0.8×10−51 cm6 almost independently of temperature, whereas B1 had the temperature dependence of the form B1=B10(1−θ/T) near the θ temperature, where temperature independent factor B10 was also unaffected by deuteration; the sole deuteration effect observed was a shift of θ temperature at which B1 vanishes.
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