Abstract
Small angle neutron scattering has been used to measure the radius of gyration of deuterated linear polystyrene at dilute concentration contained in a polystyrene network with different crosslink densities. At each crosslink density, four samples with different linear chain concentrations (less than the overlap concentration) were made. The lower crosslink density samples (Nc >180) remained single phase, while higher crosslink density samples showed evidence of phase separation. Zimm plots were made for all samples which were single phase, and the second virial coefficient was obtained as a function of crosslink density. It was found that the second virial coefficient decreased with increasing crosslink density. Single chain form factors were obtained by extrapolating the scattering data to zero concentration of the linear chain for the single phase samples. A modified Debye equation was used to fit the zero concentration extrapolated scattering data over the entire experimental q range to obtain the radi...
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