V2O5/聚亞醯胺混成膜之製備及其特性研究

Abstract

本論文合成的兩系列V2O5/PI混成膜，分別由PMDA/ODA及ODPA/ODA形成聚醯胺酸溶液，再添加不同比例的乙醯丙酮氧釩於聚醯胺酸中，形成的乙醯丙酮氧釩/聚醯胺酸混合溶液再利用XRD圖譜，找出適當的製程溫度，為考量較佳的V2O5生成與高分子的成膜性情況下，以階段式升溫：100℃( 1hr)、150℃( 1hr)、200℃( 1hr)、300℃( 1hr)、350℃( 12hr或6hr)兩製程條件，將V2O5在低溫下燒結於聚亞醯胺中，形成V2O5/PI混成膜。 在兩系列混成膜樣品的IR圖譜均顯示，V2O5的特徵吸收(在1000cm-1及700~430cm-1)的強度，均會隨著製程溫度及時間和添加的乙醯丙酮金屬比例增加而增強，表示V2O5生成隨之增加。TGA分析均顯示，隨乙醯丙酮氧釩莫耳比增加，Td有下降趨勢，可能的原因為金屬化合物在聚亞醯胺中催化PI熱氧化裂解反應的發生，造成熱安定性下降。電性質方面，兩系列混成膜樣品之導電率均隨添加乙醯丙酮氧釩的莫耳比增加而提高，約為10-11~10-10 W-1 cm-1，較純PI提升了10~1000倍。在表面型態分析方面，兩系列混成膜樣品的橫截面(cross section)SEM圖顯示，在V2O5 /聚亞醯胺混成膜中粒徑大小隨著莫耳比增加而增大。

Two series of metal containing poly(amic acid)s, precusors of V2O5 / Polyimide hybrid films, were derived from pure PAAs and Vanadiumoxy acetylacetone. The pure PAAs were prepared with PMDA ( Pyromellitic dianhydride) and ODA(4,4'-diaminodiphenylether), or ODPA(4,4- oxydiphthalic anhydride) and ODA(4,4'-diaminodiphenylether). The metal-containing PAAs were converted to V2O5 / Polyimide hybrid films by step thermal imidization: at 100℃, 150℃, 200℃,and 300℃each for 1hr, and 350℃ for 6hr or 12hr. In these conditions, V2O5 could successfully be sintered in polyimides at low temperatures in one process. The V2O5 / Polyimide hybrid films were characterized with the X-ray diffraction spectrum (XRD). In the two series of the hybrid films, IR figures showed the intensities of V2O5 vibration bands(1000cm-1and 700~430cm-1) enhanced with increasing process temperature, process time, and Vanadiumoxy acetylacetone contents. It represented the hybrid films having more crystalline V2O5 phase under these conditions. TGA profiles showed Tds decreased with increasing Vanadiumoxy acetylacetone contents. The results might be related to the metal oxide catalyzing the oxidative degradation reaction and decreasing the thermal stability of hybrid films. Conductivities of the hybrid films could be up to 10-11~10-10 W-1 cm-1, which were 1~3 orders higher than that of pure polyimide. SEM pictures of the hybrid films cross sections showed the metal oxide sizes increase with increasing Vanadiumoxy acetylacetone contents