Thermal properties were investigated using differential scanning calorimetry of blends of vinylidenefluoride‐tetrafluoroethylene (VDF‐TFE) copolymer and polymethylmethacrylate. Curie transition behavior was strongly dependent on the crystallization temperature. A Curie temperature was shown in pure VDF‐TFE copolymer and in the blend with 91 wt % VDF‐TFE copolymer, which were crystallized above the Curie temperature. The samples crystallized above the Curie temperature showed higher melting temperatures than those crystallized below the Curie temperature, resulting in an upturn of slope at high temperatures in the Hoffman‐Weeks plot. The polymer‐polymer interaction parameter was calculated to be −0·165 at 130°C from the equilibrium melting temperatures, indicating miscibility of the two components.
Miscibility and phase separation were investigated in the blend ofpoly(vinylidene fluoride-co-tetrafluoroethylene) (P(VDF-TFE)) and poly(methyl methacrylate) (PMMA). The blends showed the single glass transition and melting point depression for all blend compositions, indicating that they are miscible. The phase separation behavior of a blend was elucidated by differential scanning calorimetry (DSC). On heat£ng the blend samples, an endothermic peak in DSC thermogram appeared at the cloud point which was obtained from the change of optical transmittance of samples. The area under the endothermic curve was assumed to be the heat of demixing. It showed a maximum near 50 wt¾ of P(VDF-TFE). From the heat of demixing, the compositional dependence of interaction parameter was calculated and it was an increasing function of P (VDF-TFE) content.
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