Viscoelastic Properties of Melts of 'RADEL R' Polysulfone Fractions

Abstract

The linear viscoelastic properties of a series of RADEL R polyethersulfone fractions have been studied. The molecular weight of the fractions ranged from 2.4 X 10³ to 7.2 X 10⁴. The RADEL R polyethersulfone is a thermorheologically complex material. After correction to iso-free volume, it has been found that 1/0∝M^3.4, _w in agreement with the relation expected for entangled flexible polymers. Below M_w = 10 000, 1/0∝ M^2.0 _w. From integration under the loss peak of high molecular weight fractions it is found that the plateau modulus G°_N=3.6x 10⁷. It is calculated that at 282°C the molecular weight between entanglements is M_e=1550. The high plateau modulus is related to the molecular parameters of RADEL R polyethersulfone. Both the Graessley-Edwards model and the Lin model are discussed for a number of polymers that contain phenylene groups in the main chain.

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