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Energetics of stress relaxation of glassy polymers at high pressure
Author(s) -
Goldman A. Ya.,
Maksimov V. L.,
Kestelman V. N.
Publication year - 1991
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.760312008
Subject(s) - isochoric process , isobaric process , materials science , thermodynamics , relaxation (psychology) , stress relaxation , isothermal process , stress (linguistics) , polymer , kinetic energy , activation energy , chemistry , composite material , creep , psychology , social psychology , linguistics , physics , philosophy , quantum mechanics
Kinetic changes of relaxation of the shift stress of glassy poly(methyl methacrylate) were studied when temperatures and pressures were changed in isobaric, isothermal, and isochoric conditions. In isochoric conditions the relaxation rate depends slightly on temperature. The volume of the polymer is the main parameter for the rate of stress relaxation. Isobaric and isochoric activation energies and activation vohime of stress relaxation were determined. The results are shown to satisfy the thermodynamic relation of the activation parameters of the relaxation process. The dimensions of elementary kinetic unit of the stress relaxation process were estimated.