Volume relaxation in polymers
article
Volume relaxation and related phenomena in the glass transition of polymers are discussed. During volume relaxation, the molecular transport mobility changes. First, this in principle implies non-linearity of the volume relaxation process itself. The apparent contradiction of this fact with the linearity domain found experimentally by Goldbach (1) could be explained. Secondly, during volume relaxation the viscoelastic processes change their location in time scale, due to the change in molecular transport mobility. This is demonstrated by experimental results for poly(styrene). The change of mechanical properties during volume relaxation strongly increased with a decrease in frequency of the mechanical deformation. Consequently one should also be careful with mechanical measurements in the glass transition range, especially when performed at lower frequencies. A semi-automatic method to perform simultaneously a large series of isothermal volume relaxation measurements is presented. © 1966 Dr. Dietrich Steinkopff Verlag.
TNO Identifier
226936
ISSN
00354511
Source
Rheologica Acta, 5(4), pp. 303-311.
Publisher
Steinkopff-Verlag
Pages
303-311
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