湿化学法制备β-PVDF/NiZn铁氧体复合膜的微结构和介电性能  

Microstructure and Dielectric Properties of β-PVDF/NiZn Ferrite Composite Films Prepared by Wet Chemistry Route

作　　者：陈倩[1] 杜丕一[1] 金璐[1] 翁文剑[1] 韩高荣[1] 

机构地区：[1]浙江大学硅材料国家重点实验室,浙江杭州310027

出　　处：《稀有金属材料与工程》2008年第A02期139-142,共4页Rare Metal Materials and Engineering

基　　金：国家自然科学基金(50372057);国家自然科学基金重点项目(50332030)

摘　　要：采用溶液浸渍提拉法制备了β-PVDF/NiZn铁氧体复合膜。PVDF在60℃下恒温结晶时主要形成了极性的正交相β晶型,呈典型的球晶结构晶体,以较疏松颗粒堆积形式存在,膜的致密度较低,电容达到30～45pF,比未加NiZn铁氧体的单相PVDF膜提高了3～5倍;在100℃下恒温结晶主要形成非极性的单斜相α晶型,晶粒以二维生长为主,晶粒间紧密接触,膜较致密,电容为20～30pF。而当恒温结晶温度较低(50℃)时,PVDF结晶较差,呈非晶相存在,电容为10～15pF。A novel semi-conductive Ni-Zn ferrite/polyvinylidene fluoride （PVDF） composite film was prepared by wet chemical method. Phase structures, morphology and the dielectric properties of such films were investigated. The PVDF composite film shows polar orthorhombic β phase, typical spherical crystalline phase structure, loose stacking and low compactness, when heat-treated at 60 ℃, While film with densely stacked non-polar monoclinic a phase is formed at 100 ℃. Only amorphous state PVDF composite film is formed at 50 ℃. β-PVDF composite film has the capacity from 30 to 45 pF, which is 3-5 times higher than that of β-PVDF films without addition of Ni-Zn ferrite, α-PVDF composite film has the capacity ranged from 20-30 pF and amorphous state PVDF composite film shows only the capacity of about 10-15 pF.

关 键 词：β-PVDF NIZN铁氧体 复合膜 晶相形成 介电性能 

分 类 号：TB43[一般工业技术]