Effect of solvent type, conditions of dissolution and evaporation temperature on crystallinity phases of PVDF
Abstract
Poly (vinylidene fluoride) (PVDF) is a semi-crystalline polymer which can form different crystals depending on the condition of the crystallization. These different crystal structures include non-polar α-phase and the polar one (ß-phase). In order to study the effect of the conditions of the crystallization and the evaporation temperature on the crystallinity of the PVDF, we have investigated the solubility of the PVDF using five solvents: dimethylformamide (DMF), tetrahydrofuran (THF), Methyl ethyl ketone (MEK), chloroform and acetone. Three solutions with different conditions of PVDF casted in the DMF were prepared. The two solutions prepared at low temperature and crystallization time showed α crystalline phase, while the third one exhibited the ß-phase form regardless of the high temperature and the long preparation time. The evaporation temperature and time have also influenced the crystalline obtained phase of the PVDF.
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