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Characterization of Poly(ε-Caprolactone) via Size Exclusion Chromatography with Online Right-Angle Laser-Light Scattering and Viscometric Detectors

Poly( l -caprolactone) was characterized by size exclusion chromatography on-line with a right-angle laser-light scattering photometer and a four-capillary bridge design differential viscometer (SEC/RI/RALLS/DV) in tetrahydrofuran (THF) at 25°C. The dependence of intrinsic viscosity and radius of gyration of poly( l -caprolactone) on molecular weight was established, and Flory's characteristic ratio C X was calculated for this polymer from these data. The results show that THF is a good solvent for poly( l -caprolactone). Poly( l -caprolactone) exhibits a random-coil conformation in THF, and SEC with online RALLS and DV detectors offer an easy way to obtain information on chain flexibility. The C X results are in good accord with previously reported values for this polymer.