| Summary: | 碩士 === 中原大學 === 化學工程研究所 === 89 ===
Various series of novel fluorinated fully aromatic polyimides has been synthesized prepared from the novel fluorinated diamine monomers with four available aromatic dianhydride monomers respectively. The effects of the fluorine content polyimides on their properties were investigated by DSC, TGA, and DEA.
In this study, it was found that the solubility and optical transparency increase as the increase of the fluorine content in polyimides. Furthermore, the moisture absorption and dielectric constant significantly decreases as the increase of the fluorine content in polyimides. For an example, the fluorinated polyimide, based on 2-(1,1,1,3,3,3-hexafluoro-2-phenyl-2-propanoxy)-1,4-phenylenediamine monomer, shows high optical transparency, high solubility, low dielectric constant（dielectric constant = 2.45）, and low moisture absorption（moisture absorption = 0.35%）. Another series of copolyimides, prepared from 9,9-bis-[4-(4-amino-2-(trifluoromethyl)- phenoxy)phenyl]fluorene（M4）and 2-(1,1,1,3,3,3-hexafluoro-2-phenyl- 2-propanoxy)-1,4-phenylenediamine（M6）monomers, showed dielectric constant as low as to 2.41 .
In addition, the crosslinkable fluorinated copolyimides have been prepared from the diamine containing reactive functional group（2,2'- dimethacryloyl-4,4'-diaminobiphenyl）with three fluorinated diamine monomers. After crosslinking reaction, the crosslinkable fluorinated copolyimides showed significant enhancement in inherent viscositity and thermal properties and high elasticity of the fluorinated polyimide films can be obtained.
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