摘要
采用超声模板法制备了平行束状纳米ZnO晶须,将其与压电高聚物PVDF复合,用热压法制备六种含平行晶须状纳米ZnO不同质量分数与不同形态、尺寸的ZnO的ZnO/PVDF复合材料。经取向、极化后对其结构、形态及介电性和压电性能进行了系统测试。结果表明:尺寸与形态对压电复合材料的影响极大,球型、准球型、四针状纳米ZnO和非纳米ZnO与无定型PVDF复合,虽经同样条件极化处理,并无压电性能产生。与传统观念不同,即使主体为PVDF,但随着平行晶须状纳米ZnO含量的增加,电性能参数呈非线性增大,在ZnO含量仅为15%左右时就产生了复合材料介电常数ε和压电常数d33值的转折性突跃,与单一压电高聚物材料相比显著增加,且极化性能得到明显提高。
Nanometer sized ZnO with unique parallel whisker morphology has been prepared by Sono-chemical reaction/sol processing procedure within a designed hybrid liquid crystal molecular template. Six sorts of ZnO/PVDF composites were prepared with different ZnO ratio by hot pressing technique. PVDF, as the major component of composite, its typical piezoelectric property could not be shown any longer as traditional conception. Dielectric and piezoelectric test results show that electric parameter value of composite nonlinear increases with the increasing of ZnO content. Dielectric constant ε and piezoelectric constant d33 increases notably around 15% as compared to piezoelectric polymer and the polarization performance greatly improved. The size and morphology of ZnO has great influence on the piezoelectric property of the composites. When the particles are not nanometer sized, they do not show the typical UV-adsorption and piezoelectric properties. If the particles are nanometer sized, only such nano ZnO with unique parallel whisker or belt morphology can show piezoelectric properties, while other type of ZnO can not.
出处
《高分子材料科学与工程》
EI
CAS
CSCD
北大核心
2007年第1期242-245,共4页
Polymer Materials Science & Engineering
关键词
ZNO
PVDF
压电复合材料
介电性
压电性
ZnO
PVDF
piezoelectric composites
dielectric properties
piezoelectric properties
