Abstract
The formation mechanism of banded spherulites of poly(vinylidene fluoride) has been examined experimentally by optical and atomic force microscopies. We have confirmed the proportional relationship between the band spacing and the maximum lateral width of lamellar crystals at the growth front, and the square root dependence of the maximum width and the band spacing on the growth rate. The square root dependence suggests a splaying instability of the growth front regulated by a gradient of free energy in the liquid side, and the proportional dependence suggests the dominant effect of torsional re-orientation on the occasion of splaying in the period determination of band spacing.
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Toda, A., Taguchi, K., Hikosaka, M. et al. Branching and Higher Order Structure in Banded Poly(vinylidene fluoride) Spherulites. Polym J 40, 905–909 (2008). https://doi.org/10.1295/polymj.PJ2007191
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DOI: https://doi.org/10.1295/polymj.PJ2007191