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Physical aging of polymersProgress in Polymer Science, 20
- Publisher
- Wiley
- Copyright
- Copyright © 1996 Society of Plastics Engineers
- ISSN
- 0032-3888
- eISSN
- 1548-2634
- DOI
- 10.1002/pen.10700
- Publisher site
- See Article on Publisher Site
Abstract
In this work, we have investigated by differential scanning calorimetry the enthalpy relaxation of two poly(methyl(α‐n‐alkyl)acrylates) in which it is possible to change the length of the two alkyl chains. In particular, we have evaluated the Narayanaswamy parameter, which controls relative contribution of temperature and of structure to the relaxation times, by two methods: Grenet's method (GM) and the peak‐shift method (PSM). The data obtained show that both methods lead to equivalent results. Nevertheless, PSM requires fewer experiments than GM, and PSM appears to be more practical. The results obtained on the two acrylates show that the parameter x increases with the lateral chain length, that is to say, that the temperature effects increase as the length of the alkyl chain is increased.
Journal
Polymer Engineering & Science – Wiley
Published: Dec 1, 1996