溶胶－凝胶法原位制备PI /SiO2杂化薄膜的结构及形态研究

采用溶胶一凝胶法在聚酸胺酸溶液中引人二氧化硅( SiO2)溶胶，并经热酸亚胺化后制备了聚酸亚胺二氧化硅( PI /SiO2)杂化薄膜。采用X一射线能谱、红外光谱,X一射线衍射和原子力显微镜等方法，研究了SiO2含量对杂化薄膜元素组成、化学结构、晶体结构及表面形貌的影响。结果表明，在亚胺化的过程中，PI薄膜中原位形成了非晶态的无机硅烷网络;生成的SiO2颗粒粒径随其含量的增加而增大，在SiO2含量低于5%(质量分数，下同)时，其粒径不超过50 nm，当其含量达到7%时，颗粒的粒径急增至200 nm，表明颗粒发生了团聚。

Structure and Morphology of PI/SiO_2 Hybrid Films In-Situ Prepared by Sol-Gel Technology

Silica sol was introduced into polyamide acid and a polyimide (PI)/silica (SiO_2) hybrid film was obtained after amidization of PAA.The influence of silica content on element composition,chemical structure,crystal structure,and morphology of the hybrid film was determined using EDS,FT-IR, XRD,and AFM.During imidization,random inorganic silicon-oxygen network was formed.Size of SiO2 particle increased with increasing SiO_2 content.When SiO_2 content was lower than 5 wt%,the size of SiO_2 was less than 50 nm,...