Abstract: The applicability of universal calibration to a long branched chain of polyvinylchloride is researched immediately by the apparatus of GPCcombined with a continuous viscometer and a low angle laser light scattering photometer.Results show that universal calibrations are all applicable to fractions of all branched polyvinylchloride whose branched parameter g'(= [η]_b/[η]_l) is more than 0.4 and the fractions of linear polyvinylchloride.

Key words: GPC-continuous viscometer-low angle light scattering photometer, Long chain branching, Polyvinylchloride, Universal calibration