DSC studies on the transitions in poly(vinylidenefluoride) and some related copolymers |
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| Authors: | C Leonard J L Halary L Monnerie F Micheron |
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| Affiliation: | (1) Laboratoire P.C.S.M., Ecole Supérieure de Physique et Chimie Industrielles de la Ville de Paris, 10, rue Vauquelin, 75231 Paris Cedex 05, France;(2) Laboratoire Central de Recherches, Thomson-CSF, Domaine de Corbeville, 91401 Orsay Cedex, France |
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| Abstract: | 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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