纳米氢氧化镧/聚酰亚胺复合超薄膜的制备、表征及其性能

Preparation,Characterization and Properties of Nano-lanthanum Hydroxide/Polyimide Ultra-thin Composite Films

本研究采用水热法合成纳米级氢氧化镧晶体(nano-La(OH)_(3)),并对其微观结构进行了测试分析。利用nano-La(OH)_(3)表面的羟基可与聚酰胺酸(PAA)中的羰基发生缩合反应的原理,通过旋涂法及热亚胺化制得nano-La(OH)_(3)/聚酰亚胺(PI)复合超薄膜。对nano-La(OH)_(3)/PI复合超薄膜进行结构表征及性能测试。结果表明:nano-La(OH)_(3)/PI复合超薄膜无色、透明,厚度约为1.66μm;薄膜表面十分平坦,表面均方粗糙度为5.85;nano-La(OH)_(3)均匀分布在薄膜中。超薄膜介电常数为4.63,高于纯PI(约3.20)的介电常数,在太阳能电池底板、微型存储器、智能皮肤等方面具有应用潜力。

In this work,lanthanum hydroxide nanocrystals(nano-La(OH)_(3))were firstly prepared using a hydrothermal method,whereas their microstructure was then characterized.Afterwards,coordination between the hydroxy groups of nano-La(OH)3and the carboxyl groups in polyamic acid(PAA)was implemented,followed by spin-coating and thermal imidization to prepare nano-La(OH)_(3)/polyimide(PI)composite ultra-thin films.The structure and performance of nano-La(OH)_(3)/PI composite ultra-thin films were characterized.It was shown that the nano-La(OH)3/PI ultra-thin films were colorless and transparent with a thickness around 1.66μm,and that the surface of the films was flat with a roughness of 5.85.Moreover,the nanocrystals were uniformly dispersed in the films.The dielectric constant of films was determined to be 4.63,higher than that of pure PI(~3.20).The ultra-thin films showed great potentials as solar panel backsheets,micro-memoria devices and smart skins.