Effects of crystallinity on ageing phenomena in poly(vinyl chloride)

C. Tsitsilianis, M. Tsapatsis, Ch Economou

Research output: Contribution to journalArticlepeer-review

16 Scopus citations

Abstract

The physical ageing of poly(vinyl chloride) (PVC) is affected by the degree of crystallinity which can be induced by annealing of the sample at temperatures above Tg. Differential scanning calorimetry (d.s.c.) measurements showed that the enthalpy relaxation, induced by sub-Tg annealing, of PVC samples with different crystallinity increases with increasing crystallization temperature (Tc). On the other hand, the enthalpy relaxation decreases with increasing crystallization time (tc) at a given Tc. These observations cannot be attributed only to the overall crystallinity percentage, but they are attributable mainly to the entire structure of the amorphous phase which depends upon above-Tg annealing conditions (Tc, tc). The assumptions of different portions of the material crystallized at different Tc and of decreasing extent of disturbed regions as tc increases seem to explain well the above findings. Solvent sorption experiments served to support our suggestions resulting from d.s.c. experiments.

Original languageEnglish (US)
Pages (from-to)1861-1866
Number of pages6
JournalPolymer
Volume30
Issue number10
DOIs
StatePublished - Oct 1989

Keywords

  • annealing
  • crystallinity
  • d.s.c.
  • enthalpy relaxation
  • physical ageing
  • poly(vinyl chloride)

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