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Segmental size of poly(ethylene terephthalate) determined by optical birefringence and ESR spin-probe method

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Abstract

The segmental size in amorphous poly(ethylene terephthalate) (PET) was determined by two methods: a) from deformational behavior of amorphous samples in the elastic state by optical birefringence measurement, and b) from dynamic behavior of a small spin probe by ESR measurement of correlation times. The use of the network model for orientation of segments in amorphous polymer and of the generalized free-volume model for re-orientation of the probe in the amorphous phase gave comparable values ofn=2.3 and 2.1 structural units/segment. We conclude that trans ⇌ gauche conformational transitions of rather small macromolecular segments are the basic motion mechanism in αa-segmental mobility in PET.

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Bartoš, J., Hloušková, Z. & Vulpius, G. Segmental size of poly(ethylene terephthalate) determined by optical birefringence and ESR spin-probe method. Colloid Polym Sci 270, 229–233 (1992). https://doi.org/10.1007/BF00655474

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Key words

  • Polyethylene terephthalate
  • segment size
  • birefringence
  • ESR