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Annealing effects on the viscoelastic anomaly between the β and γ processes for as‐polymerized polytetrafluoroethylene
Author(s) -
Takenaga Mitsuru,
Yamagata Kyozo,
Kasai Akinari,
Ariyama Takashi
Publication year - 1990
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.1990.070390807
Subject(s) - paracrystalline , viscoelasticity , annealing (glass) , polytetrafluoroethylene , materials science , amorphous solid , anomaly (physics) , composite material , polymerization , relaxation (psychology) , polymer , condensed matter physics , crystallography , chemistry , physics , social psychology , psychology
The viscoelastic anomaly found at 208 K for as‐polymerized polytetrafluoroethylene (PTFE) is investigated on the basis of thermal treatment dependence of mechanical spectra. The loss intensity and relaxation strength of the anomaly tend to decrease at annealing temperatures much lower than the melting point. The structural region relevant to the anomaly can be rearranged in more ordered states on annealing; accordingly, the loss peak of the crystalline dispersion is intesified, although that of the amorphous γ‐relaxation remains nearly unchanged. The anomaly originates from the intermediate or paracrystalline regions, many of which are included in the virgin samples; segmental motions like local mode relaxation are considered.