Freeze-dried particles of poly(ethylene oxide) (PEO) were prepared from sublimation of a 1 × 10−2 wt.-% solution of PEO in benzene in an ice-salt bath. After isothermal crystallization at 318.2 ± 0.1 K for 2 h, an unusual planar zigzag form of PEO was found. A variety of unique spherulite-like morphologies were also observed, and their formation is discussed on the basis of the interaction between solvent molecules and segment of the polymer chains.
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Gu et al. (1998) studied this question.