On the mechanical γ-relaxation modes of polycarbonate

The secondary (γ) relaxation modes of the polycarbonate of bisphenol A (PC) in the glassy state are discussed. Dynamic mechanical spectra of PC, its mixtures with plasticizers and oligomers, its blends with tetramethyl polycarbonate, as well as spectra of modified polycarbonates and of PC under stre...

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Bibliographic Details
Published in:Polymer (Guilford) 1992, Vol.33 (6), p.1223-1227
Main Authors: Hörth, F.J., Kuhn, K.J., Mertes, J., Hellmann, G.P.
Format: Article
Language:English
Subjects:
Applied sciences
dynamic mechanical spectroscopy
Exact sciences and technology
Organic polymers
Physicochemistry of polymers
polycarbonate
Properties and characterization
secondary relaxations
Thermal and thermodynamic properties
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Summary:The secondary (γ) relaxation modes of the polycarbonate of bisphenol A (PC) in the glassy state are discussed. Dynamic mechanical spectra of PC, its mixtures with plasticizers and oligomers, its blends with tetramethyl polycarbonate, as well as spectra of modified polycarbonates and of PC under stress are shown. The evidence suggests that the motions active in glassy PC are intramolecularly cooperative torsional ‘local-mode’ motions of backbone segments with about 5–7 monomer units. Cooperativity can be reduced or enhanced; it is controlled by the tightness of the matrix. Intermolecularly the motions are not cooperative.
ISSN:0032-3861
1873-2291
DOI:10.1016/0032-3861(92)90767-Q