聚酰亚胺/无机物纳米杂化材料的研究Ⅱ.聚酰亚胺(TDPA/ODA)-BaTiO_3纳米杂化物的合成与表征

Study on Polyimide-inorganic Nanocomposite Material Ⅱ Preparation and Characterization of Polyimide BaTiO_3 Nanocomposite Film

由碳酸钡、钛酸丁酯和乳酸制得钛酸钡多晶相.WAXD和TEM 分析表明, 该钛酸钡具有典型的钙钛矿结构, 粒径为30～50 nm . 此钛酸钡纳米粉被成功地分散于聚酰胺酸中并制得聚酰亚胺(TDPA/ODA) 杂化材料. TEM 和AFM 表明低含量 (< 1% BaTiO3) 的杂化膜, 无机物是以< 50 nm的球状颗粒均匀分散于聚酰亚胺基体中, 高含量 (如30% ) 杂化膜是具有光滑表面的韧性薄膜. 后者介电常数与压电常数比纯聚酰亚胺提高了近一倍.

Barium titanate (BaTiO 3) powders, prepared from barium carbonate, titanium n butoxides and lactic acid, have a typical perovskite structure with particle sizes of 30～50 nm. Dispersing the agglomerate of BaTiO 3 nanoparticles into poly(amic acid) solution followed by curing leaded to polyimide hybrid films,which were well distributed with BaTiO 3 nanoparticles when BaTiO 3 content less than 1 wt% was adopted.Highly loaded hybrid film containing 30% BaTiO 3 was toughness film with smooth surface and possessed dielectric and piezoelectric constant higher than that the parent polyimide did by almost 1 time.