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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 10 3 to 7.2 X 10 4 . 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 10 7 . 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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Roovers et al. (1990) studied this question.
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