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使用WAXD和SEM研究了高真空强静电场下半熔融态处理不同共混比例 (PA11/PVDF =0 / 10 0、2 0 / 80、40 / 6 0、6 0 / 80、80 / 2 0、10 0 / 0 )的压电聚合物PA11/PVDF共混物压片的晶体结构和形态。WAXD分析表明 ,纯PVDF经不同强度静电场半熔融态处理后晶体结构并没有发生改变 ,均为 β型PVDF ;而纯PA11经不同强度静电场半熔融态处理后晶体结构发生了改变 ,随电场强度的增加 ,部分PA11由α型向δ′型转变。PA11/PVDF共混物经不同强度静电场半熔融态处理后 ,当PA11含量较小时 ,其结晶相为由 β型PVDF和α型PA11组成的混合相 ,并没有新相产生 ;而当PA11含量较大时 ,共混物中的部分PA11同样由α型向δ′型转变 ,共混物最终的结晶相为由 β型PVDF、α型PA11和δ′型PA11组成的混合相。SEM观察表明 ,在无电场时 ,纯PA11和纯PVDF呈混乱状片晶 ,在有电场时呈沿电场方向取向的片晶 ;对于不同比例的PA11/PVDF共混物压片其显微形态在无电场时呈圆球状 ,而有电场时 ,圆球被拉偏呈柱状且沿电场方向排列 ,随PA11含量的增加 ,柱状晶变得更显著
WAXD and SEM were used to study the effects of different semi-molten states under high vacuum and high electrostatic field (PA11 / PVDF = 0/10, 20/80, 40/60, 60/80, 80/200, 10 0/0) piezoelectric polymer PA11 / PVDF blend tablet crystal structure and morphology. The WAXD analysis shows that the crystal structure of pure PVDF has not changed after being treated by semi-molten state of different strength electrostatic field, all of them are β-type PVDF. However, the crystal structure of pure PA11 changed after treated with semi- Intensity increases, part of PA11 from α to δ ’type transition. When PA11 / PVDF blends were treated with semi-molten state of different strength electrostatic field, the phase of PA11 was a mixed phase composed of β-type PVDF and α-type PA11 when PA11 content was small, When larger, part of the PA11 in the blend also changed from α-type to δ-type. The final crystalline phase of the blend was a mixed phase consisting of β-type PVDF, α-type PA11 and δ’-type PA11. The SEM observations showed that in the absence of electric field pure PA11 and pure PVDF were disordered lamellae and were oriented in the electric field under the electric field. The morphologies of PA11 / PVDF blends with different proportions were in the range of No electric field was spherical, and an electric field, the sphere was pulled off columnar and arranged along the direction of the electric field, with the PA11 content increases, columnar crystals become more significant