Abstract
AbstractEnthalpy relaxation due to physical aging of hydroxyl‐terminated poly(ether sulfone)s (PES) with various molecular weights was studied by DSC at three aging temperatures between Tg − 45°C and Tg − 10°C. The experimental results revealed that both the average enthalpy relaxation time 〈τ〉 and limiting enthalpy relaxation ΔH∞ decrease slightly with increasing molecular weight for PESs aged at the same temperature intervals Tg − Ta (where Ta < Tg). This behavior is not quite consistent with the enthalpy relaxation process of polystyrene. Agrawal reported that the relaxation spectra for polystyrenes with different molecular weights could be superimposed when Tg − Ta was the same. The experimental results of the present work suggest that the motion of segments is affected by intermolecular hydrogen bonding through the OH groups of the PES chain ends.
Published Version
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