Summary
The transition properties of poly(vinylidenefluoride) and of some related copolymers, either semicrystalline or amorphous, were studied by differential scanning calorimetry in the temperature range from 200 K to 500 K. The amorphous copolymers exhibit a single glass transition. Melting endotherms and a lower glass transition [Tg(L)] are systematically observed in the semi-crystalline materials as well as an upper glass transition [Tg(U)] for certain thermal and mechanical histories of the samples. Conditions for [Tg(U)] existence are related to solid state morphology of the macromolecules and loop length in the folded chains.
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Leonard, C., Halary, J.L., Monnerie, L. et al. DSC studies on the transitions in poly(vinylidenefluoride) and some related copolymers. Polymer Bulletin 11, 195–202 (1984). https://doi.org/10.1007/BF00258030
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DOI: https://doi.org/10.1007/BF00258030