【摘要】 本文研究了PVDF-PMMA共混体系的压电性及其分子运动.其松弛转变过程与PVDF-P(VDF-HFE)及PVDF-P(VDF-TFE)共混体系相似,压电性低于PVDF-P(VDF-TFE)共混体系.当PMMA含量为3％时,其压电性与PVDF的接近,而其退极化温度却高于PVDF以及上述二个含氟共混体系的薄膜,随着PMMA的增加,其压电性也随之减弱,这是由于非晶相中偶极子浓度降低之故.更多还原

【Abstract】 This paper reports the piezoelectricity and molecular motion of PVDF-PMMA blends. The relaxation spectrum of the blends is very similar to that of PVDF-P (VDF-HFE) and PVDF-P (VDF-TFE), but the piezoelectricity of which are wearker than that of PVDF-P (VDF-TFE). When the content of PMMA in the blend is equal to 3%, its piezoelectricity is nearly the same as PVDF, but the temperature of depolarization is higher than that of PVDF, PVDF (VDF-HFE) and PVDF (VDF-TFE). The piezoelectricity of PVDF-PMMA blends decrease with increase of the content of PMMA in the blends, owing to the lower concentration of the dipoles in the noncrystalline phase.更多还原