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Relaxation of damped debye lattices: Poly(methyl methacrylate)
Author(s) -
Lin Kang Chi,
Aklonis J. J.
Publication year - 1981
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.760211112
Subject(s) - plasticizer , viscoelasticity , materials science , methyl methacrylate , relaxation (psychology) , poly(methyl methacrylate) , glass transition , thermodynamics , intermolecular force , debye , polymer chemistry , polymer , composite material , molecule , organic chemistry , chemistry , physics , psychology , social psychology , monomer
The damped Debye lattice model has been helpful in structuring molecular interpretations of viscoelastic relaxation in the primary transition region. Here, this model has been applied to the viscoelastic behavior of plasticized poly(methyl methacrylate) PMMA samples in the primary transition region. More than 25 samples using 11 different plasticizer systems were studied. The steepness indices of these samples remain experimentally indistinguishable from 1.0 inspite of the fact that substantial changes in characteristic temperatures were observed. These results on diluted PMMA lead to the conclusion that intermolecular interactions are dominant in these systems. If this is true, the model clearly predicts that further plasticization will be accompanied by a very distinctive variation of steepness index with plasticizer concentration.