Molecular weight, root-mean-square radius, and conformational information obtained from aqueous size exclusion chromatography (SEC) and multiangle laser light-scattering (MALLS) detection are examined for amine-functional polymers. These include homopolymers and copolymers of poly(ethenylformamide) and cationic poly(vinylamine). Light-scattering studies for poly(ethenylformamide) employing 15 angles of detection are used to calculate molecular weights as high as 700,000 daltons with a root-mean-square radius of nearly 50 nm. Calculated conformational coefficients indicate a random-coil configuration at low molecular weights and a more compacted conformation at high molecular weights. Molecular weights and root-mean-square radius values for cationic poly(vinylamine) are determined using a three-angle MALLS detector. Root-mean-square radius is strongly dependent on the ionic strength of the mobile phase. Cationic poly(vinylamine) exhibits a rod-like conformation at both low and high ionic strength. Explanations are proposed for this behavior.