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Great balls of fiber! Annealing of a dilute aqueous solution of poly(2-isopropyl-2-oxazoline) above its cloud point leads to the formation of a coagulate in the form of crystalline nanofibers (see microscopy image). Directional crystallization, which occurs below the glass transition temperature of the polymer at 65 °C, is driven by hydrophobic and dipolar interactions in combination with a solvation effect.
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Demirel et al. (2007) studied this question.
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