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Studies of relaxation phenomena in polymers. IV. Superimposed transition mechanisms in polymethacrylates
Author(s) -
Jansson JanFredrik
Publication year - 1973
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.1973.070171007
Subject(s) - viscoelasticity , relaxation (psychology) , weighting , polymer , function (biology) , thermodynamics , materials science , polymer science , statistical physics , polymer chemistry , chemistry , physics , composite material , psychology , social psychology , evolutionary biology , biology , acoustics
The existence of superimposed transition mechanisms in the “ T g region” of polymethacrylates has been indicated by several authors including Ferry and co‐workers, who also have tried to separate the mechanisms. Using the general properties of the viscoelastic function log J 2 = g α {log J 1 } and a simple weighting model, the α‐and β‐mechanisms have been separated. The viscoelastic function log J 2 = g β{log J 1 } is determined and is found to coincide both where different polymethacrylates are concerned and for the calculated as well as the directly measured data.