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Physical aging of poly(ether sulfone) from enthalpy relaxation measurements
Author(s) -
Jong Shi Ru,
Lee Jun Sheng,
Yu Tzyy Lung
Publication year - 1997
Publication title -
macromolecular chemistry and physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.57
H-Index - 112
eISSN - 1521-3935
pISSN - 1022-1352
DOI - 10.1002/macp.1997.021980802
Subject(s) - enthalpy , relaxation (psychology) , polystyrene , chemistry , ether , enthalpy of vaporization , intermolecular force , thermodynamics , polymer chemistry , sulfone , hydrogen bond , molecule , organic chemistry , polymer , physics , social psychology , psychology
Abstract Enthalpy 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 T g − 45°C and T g − 10°C. The experimental results revealed that both the average enthalpy relaxation time 〈τ〉 and limiting enthalpy relaxation Δ H ∞ decrease slightly with increasing molecular weight for PESs aged at the same temperature intervals T g − T a (where T a < T g ). 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 T g − T a 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.