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Enthalpy recovery and physical aging of polymer‐diluent binary systems: A network epoxy and water
Author(s) -
Ellis T. S.,
Kahasz F. E.
Publication year - 1986
Publication title -
polymer engineering and science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.503
H-Index - 111
eISSN - 1548-2634
pISSN - 0032-3888
DOI - 10.1002/pen.760260405
Subject(s) - plasticizer , glass transition , materials science , epoxy , enthalpy , diluent , thermodynamics , context (archaeology) , desorption , atmospheric temperature range , polymer , sorption , polymer chemistry , composite material , chemistry , organic chemistry , paleontology , physics , adsorption , biology
Physical aging of a network epoxy resin in both the dry and water plasticized state has been investigated using calorimetric methods. Enthalpic retardation (recovery) towards equilibrium below the glass transition temperature ( TK ) has been qualitatively and quantitatively evaluated over a wide temperature range by following the enthalpy recovered ( Er ) on re‐heating through to and beyond the glass transition. Results indicate that water, acting as a plasticizer, accelerates aging at any given temperature. However, by using the respective Tg as a point of reference, a simple comparison of the kinetics of aging in the dry and plasticized state suggests that in the temperature range studied there are no significant differences. These observations, together with observed dilational and relaxational effects of water which appears to erase all accumulated aging effects in dry aged material, are commented upon and their importance in the' context of transport‐phenomena and moisture sorption‐desorption cycles are discussed.