- 學位論文
高固含量之超順磁氧化鐵奈米粒子/聚醯亞胺奈米複合薄膜之合成跟特性探討
Preparation and characterization of superparamagnetic iron-oxide/polyimide nanocomposite films with a high solid content
摘要
本論文研製之氧化鐵磁性粒子/PI複合膜，是以超音波法分散共沉法所得氧化鐵磁性奈米粒子於不同黏度的Polyamic acid (PAA)/ Dimethylacetamide(DMAc)溶液，於玻璃基板塗佈後於大氣中350℃轉化製備而成，探討PAA/DMAc溶液黏度對成膜性與分散性的影響，複合膜並以XRD、FTIR、TGA進行相檢測。 PAA/DMAc溶液黏度可由1.原料莫爾比(PMDA/ODA =0.85~1.02)，(2)反應溫度(25及70 oC)所控制，實驗發現，高原料莫耳比所得的PAA溶液黏度較高、成膜性較好，但對Fe3O4的分散性較差；高反應溫度(70oC)所的PAA溶液黏度較低，成膜性相當，但對氧化鐵的分散性較前兩者好，可高達28 %。複合膜的熱分解溫度低於原PI膜。此高固含量氧化鐵磁性粒子/PI複合膜具有開發成吸波材料的可能。
並列摘要
In this study the superparamagnetic iron oxide nanopaparticles are prepare from co-precipitation methods, and then dispersed into the solution of polyamic acid (PAA)/ dimethylacetamide (DMAc) with different viscosity via the assistance of sonication. The resulted precursors are spread on glass substrate and cured at 350℃. The parameters of viscosity with the film integrity are studied, and films are also characterized by XRD, FTIR, and TGA. The viscosity is controlled by the mole ratio of PMDA/ODA between 0.85 and 1.02 and the reaction temperature (25 and 70℃). The results show higher PMDA/ODA ratio leads to higher viscosity and better film integrity, however, with a poor dispersability of iron oxide nanoparticles. The higher reaction temperature of 70℃ leads to PAA solution with a low viscosity and reasonably good film integrity. Most importantly, the solid content can be as high as 28 %. The composite film generally shows lower decomposition temperature as shown in TGA experiments. This high solid content films show potential application as EM absorption materials.