Abstract
The z-average radii of gyration 〈 s 2〉 z of both cyclic (r) and linear (l) poly(phenylmethylsiloxanes) (PPMS) in dilute solution in benzene-d 6 were measured by small-angle neutron scattering. The PPMS samples studied consisted of fractions with heterogeneity indices in the range 1.04 < M w M n < 1.15 and z-average molar masses in the range 3500 < M z < 21 200 g mol −1. The neutron scattering results were found to be in agreement with the theoretically predicted ratio 〈s 2〉 l 〈s 2〉 r = 2 for ‘flexible’ linear and cyclic polymers unperturbed by excluded volume effects. The neutron scattering functions of cyclic and linear PDMS with scattering vectors Q in the region Q〈s 2〉 1 2 > 1 were also examined.
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