Oxygen-barrier properties of cold-crystallized and melt-crystallized poly(ethylene terephthalate-co-4,4′-bibenzoate)

This study examined the oxygen‐transport properties of poly(ethylene terephthalate‐co‐bibenzoate) (PETBB55) crystallized from the melt (melt crystallization) or quenched to glass and subsequently isothermally crystallized by heating above the glass‐transition temperature (cold crystallization). The...

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Bibliographic Details
Published in:Journal of polymer science. Part B, Polymer physics Polymer physics, 2002-11, Vol.40 (22), p.2489-2503
Main Authors: Hu, Y. S., Liu, R. Y. F., Rogunova, M., Schiraldi, D. A., Nazarenko, S., Hiltner, A., Baer, E.
Format: Article
Language:English
Subjects:
Applied sciences
cold crystallization
diffusion
Exact sciences and technology
FT-IR
melt crystallization
Miscellaneous
Organic polymers
oxygen diffusion
oxygen sorption
Physicochemistry of polymers
poly(ethylene terephthalate-co-bibenzoate)
polyesters
Properties and characterization
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Summary:This study examined the oxygen‐transport properties of poly(ethylene terephthalate‐co‐bibenzoate) (PETBB55) crystallized from the melt (melt crystallization) or quenched to glass and subsequently isothermally crystallized by heating above the glass‐transition temperature (cold crystallization). The gauche–trans conformation of the glycol linkage was determined by infrared analysis, and the crystalline morphology was examined by atomic force microscopy. Oxygen solubility decreased linearly with volume fraction crystallinity. For melt‐crystallized PETBB55, extrapolation to zero solubility corresponded to an impermeable crystal with 100% trans glycol conformations, a density of 1.396 g cm−3, and a heat of melting of 83 J g−1. From the melt, PETBB55 crystallized as space‐filling spherulites with loosely organized lamellae and pronounced secondary crystallization. The morphological observations provided a structural model for permeability consisting of impermeable platelets randomly dispersed in a permeable matrix. In contrast, cold‐crystallized PETBB55 retained the granular texture of the quenched polymer despite the high level of crystallinity, as measured by the density and heat of melting. Oxygen solubility decreased linearly with volume fraction crystallinity, but zero solubility corresponded to an impermeable defective crystal with a trans fraction of 0.83 and a density of 1.381 g cm−3. © 2002 Wiley Periodicals, Inc. J Polym Sci Part B: Polym Phys 40: 2489–2503, 2002
ISSN:0887-6266
1099-0488
DOI:10.1002/polb.10307