Small-angle X-ray scattering from semidilute polymer solutions

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 x 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. (author)