A modulated DSC study on the stress oscillation phenomenon in a syndiotactic polypropylene

J. Karger-Kocsis, P. P. Shang

Research output: Contribution to journalArticle

12 Citations (Scopus)

Abstract

The static loading-induced stress oscillation (SO) in syndiotactic polypropylene (sPP) was studied by modulated differential scanning calorimetry (TMDSC). Samples were taken from the initial necked, premature and mature SO oscillation ranges, respectively, and the related calorimetric responses were compared to those of the bulk material. It was established that necking caused some decrease in the crystallinity. In addition, necking resulted in cold crystallization that was assigned to a polymorphic transition (from all-trans to helical conformation) based on literature results. The TMDSC response was practically the same for necked samples with and without SO. A model was proposed to explain SO. The model assumes the presence of a network (similar to that of semicrystalline thermoplastic elastomers), which is highly stretchable and fails by sudden voiding at the intersections of shear micro bands intermittently.

Original languageEnglish
Pages (from-to)499-507
Number of pages9
JournalJournal of Thermal Analysis and Calorimetry
Volume69
Issue number2
DOIs
Publication statusPublished - 2002

Fingerprint

Polypropylenes
polypropylene
oscillations
Thermoplastic elastomers
Crystallization
Conformations
Differential scanning calorimetry
elastomers
intersections
crystallinity
heat measurement
crystallization
shear
scanning

Keywords

  • Modulated DSC
  • Stress oscillation
  • Syndiotactic polypropylene (sPP)

ASJC Scopus subject areas

  • Chemical Engineering(all)

Cite this

A modulated DSC study on the stress oscillation phenomenon in a syndiotactic polypropylene. / Karger-Kocsis, J.; Shang, P. P.

In: Journal of Thermal Analysis and Calorimetry, Vol. 69, No. 2, 2002, p. 499-507.

Research output: Contribution to journalArticle

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