ISSN:
0025-116X
Keywords:
Chemistry
;
Polymer and Materials Science
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
,
Physics
Notes:
Molecular motions of poly(vinyl chloride) (PVC) in the glass transition range were studied by means of dielectric spectroscopy. The measurements were carried out with three different PVC samples obtained at different polymerization temperatures (0, 60 and 90°C) showing strong variations in their contents of syndiotactic, heterotactic and isotactic triads. The results show that all parameters (relaxation strength, temperature of the maxima of loss curves, evolution of the shift factors, master curves) characterizing the dielectric α-relaxation in the liquid state of PVC are strongly affected by the tacticity. These facts are interpreted in terms of the role of specific local conformations in the motion of chain segments in the polymer molecules. These conclusions are in agreement with those outlined from the results previously obtained on PVC for the molecular motions in the glassy state just below the glass transition temperature.
Additional Material:
7 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/macp.1989.021901223
