Abstract
The influence of third monomer units with different chain lengths on the phase-transition behavior of the uniaxially oriented ethylene tetrafluoroethylene (ETFE)-alternating copolymer has been investigated through the use of temperature-dependent measurements of X-ray fiber diagrams, small-angle X-ray scattering patterns and polarized infrared spectra. (i) The phase transition between the low- and high-temperature phases occurs discontinuously; (ii) in the transition, the conformational disordering and radical thermal motion of the chains occur drastically as known from the increment of the half-width of the X-ray 004 reflection profile in the high-temperature region, which is associated with the trans-gauche conformational disordering; (iii) the phase-transition temperature decreases with an increase in the third monomer unit content, and the decreasing rate is overwhelmingly higher for the terpolymer with short CF3 groups than for the terpolymer with longer C4F9 groups. The CF3 groups are included in the crystal lattice and affect the phase-transition point significantly, whereas the C4F9 groups are expelled from the lattice and affect the transition behavior to a small degree; and (iv) The temperature-dependent two-dimensional small-angle X-ray scattering pattern measurements of the oriented samples revealed that the long period of the stacked lamellar structure did not change in the transition between the low- and high-temperature phases.
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Acknowledgements
This study was financially supported by a MEXT ‘the International Project on the Basic Research Promotion for the Development of Highly Controlled Multi-Purpose Polymer Materials’ in ‘the Strategic Project to Support the Formation of Research Bases at Private Universities’ (2010–2014).
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Funaki, A., Phongtamrug, S. & Tashiro, K. Effect of the third monomer unit on the phase transition of oriented ethylene-tetrafluoroethylene copolymer studied by the temperature-dependent measurements of 2D X-ray scattering and polarized infrared spectroscopy. Polym J 45, 545–554 (2013). https://doi.org/10.1038/pj.2012.177
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DOI: https://doi.org/10.1038/pj.2012.177
