Physical aging kinetics of syndiotactic polystyrene as determined from creep behavior

Jorg Beckmann, Gregory B. McKenna, Brian G. Landes, David H. Bank, Robert A. Bubeck

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24 Scopus citations


Creep experiments in uniaxial extension have been performed to explore the kinetics of the physical aging process in semicrystalline syndiotactic polystyrene (sPS) having two processing histories. Classical time-aging time superposition behavior was found for both materials at temperatures from 70 to 95°C, with the shift rate μ decreasing as temperature was increased. Virtually no aging was seen at 95°C, the DSC determined glass transition, Tg. This behavior was atypical for a semicrystalline polymer and reminiscent of the behavior of glassy amorphous thermoplastics. Some evidence for a separate crystalline aging mechanism > Tg, which manifests itself as only vertical shifts without timescale shifts, is seen in experiments at T > 100°C. Finally, the two different materials age differently, suggesting that some control of aging can be obtained by altering processing conditions or morphology.

Original languageEnglish
Pages (from-to)1459-1468
Number of pages10
JournalPolymer Engineering and Science
Issue number9
StatePublished - 1997


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