Au@PS纳米颗粒掺杂PDMS/(PVDF-TrFE)复合薄膜的制备及介电-疏水性能  

Preparation and Enhanced Dielectric-hydrophobic Properties of PDMS-PVDF Composite Films with Au@PS Nanoparticle

作　　者：张启龙[1] 姚丽琴 朱志才 张钊[1] 杨辉[1] ZHANG Qilong;YAO Liqin;ZHU Zhicai;ZHANG Zhao;YANG Hui(School of Materials Science and Engineering,State Key Lab Silicon Mat,Zhejiang University,Hangzhou 310027,China)

机构地区：[1]浙江大学材料科学与工程学院,硅材料国家重点实验室,杭州310027

出　　处：《高等学校化学学报》2020年第6期1269-1276,共8页Chemical Journal of Chinese Universities

基　　金：国家自然科学基金(批准号:51772267)资助.

摘　　要：结合乳液聚合和还原法在250 nm的聚苯乙烯(PS)微球表面均匀负载了Au纳米颗粒.通过溶液共混法,使Au@PS纳米颗粒与聚二甲基硅氧烷(PDMS)/聚偏氟乙烯-三氟乙烯[P(VDF-TrFE)](质量比为2∶3)均匀混合,制备出结构致密、Au@PS均匀分布的微突起的复合薄膜.研究了不同Au@PS纳米颗粒掺杂量对复合薄膜的结构、熔融结晶行为和介电疏水特性的影响.研究发现,Au@PS纳米颗粒的引入阻碍了P(VDF-TrFE)的β相的产生,但对PDMS/P(VDF-TrFE)复合薄膜的化学健结构没有显著影响;随着Au@PS纳米颗粒含量的增多,复合薄膜结晶温度和玻璃化转化温度升高,熔点略有降低.由于界面极化和微电容效应协同作用,掺杂Au@PS复合薄膜的介电常数有显著提升.PS球表面均匀负载的Au纳米颗粒减少了导电网络的构成,使介电损耗维持在较低值.掺杂5%(质量分数)Au@PS的复合薄膜介电常数达到22(100 Hz),分别为纯PDMS和PDMS/P(VDF-TrFE)的8.8倍和3.14倍,同时具有优异的疏水特性,接触角达到112.31°.Au nanoparticles were uniformly loaded on the surface of polystyrene(PS)microspheres with an average diameter about 250 nm via the emulsion polymerization and reduction method.The PS/Au was homogeneously mixed with polydimethylsiloxane(PDMS)/poly(vinylidene fluoride-co-trifluoroethylene)[P(VDF-TrFE)](mass ratio:2:3)by solution blending method,and the dense composite film with uniform distribution of Au@PS particle and micro bulge surface were obtained.The effects of Au@PS doping content on composite films structure,melting crystallization behavior and dielectric-hydrophobic properties were investigated.It was found that the introduction of Au@PS nanoparticles hinders theβphase formation of P(VDF-TrFE),but has no obvious effect on the bonding structures.The crystallization temperature and glass-transition temperature of composite films increases,and their melting point decreases slightly with increasing the Au@PS content.Due to the synergistic effect of interface polarization and micro capacitance,the dielectric constant of composite film with Au@PS nanoparticles is significantly increased.The Au nanoparticles uniformly loaded on the surface of PS sphere reduce the formation of conductive network,thus maintain a relatively low dielectric loss value.Typically,the dielectric constant of the blend film with 5%(mass fraction)Au@PS nanoparticle reaches 22 at 100 Hz,which is 8.8 and 3.14 times that of pure PDMS and PDMS/P(VDF-TrFE),respectively.The blend film with 5% Au@PS also possesses a large contact angle of 112.31°due to the interaction of hydrophilic Au nanoparticles and the existence of micro bulge structure.All the improved performances show great potential application for electrowetting devices.

关 键 词：溶液法 介电性能 疏水性能 复合薄膜 

分 类 号：O647[理学—物理化学]