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首页> 外文期刊>Journal of Applied Polymer Science >Studies of Dielectric Characteristics and Surface Energies of Spin-Coated Polyimide Films
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Studies of Dielectric Characteristics and Surface Energies of Spin-Coated Polyimide Films

机译：旋涂聚酰亚胺薄膜的介电特性和表面能的研究

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A two-step method, that is, polyamic acid formation with subsequent curing, was used to synthesize six kinds of polyimides. Dielectric constants and surface energies were investigated to determine the nature of the fluorinated and nonfluorinated polyimides. The dielectric constant decreased from 3.3 (at 100 kHz) for PMDA/ODA to 2.6 (at 100 kHz) for 6FDA/4,4'-6F when the fluorine content increased from 0 to 30.7 wt %. Simultaneously, the water contact angle increased from 65 deg for PMDA/ODA to 78 deg for 6FDA/4,4'-6F. Experimental results indicated that fluorinated polyimides contained a lower dielectric constant with improved water resistance. The surface energy values obtained from experiments agreed well with Holmes' correlation between surface energy and dielectric constant. The surface energies and dielectric constants were significantly affected by the polymer backbone structures, especially by the fluorination effect. Therefore, by choosing the appropriate monomers, polyimides of low dielectric constants with hydrophobic surface could be obtained.
机译：使用两步法，即在随后的固化过程中形成聚酰胺酸，来合成六种聚酰亚胺。研究了介电常数和表面能以确定氟化和非氟化聚酰亚胺的性质。当氟含量从0增加到30.7 wt％时，介电常数从PMDA / ODA的3.3（在100 kHz下）降低到6FDA / 4,4'-6F的2.6（在100 kHz下）。同时，水接触角从PMDA / ODA的65度增加到6FDA / 4,4'-6F的78度。实验结果表明，氟化聚酰亚胺的介电常数较低，耐水性提高。从实验中获得的表面能值与Holmes在表面能和介电常数之间的相关性非常吻合。表面能和介电常数受聚合物主链结构特别是氟化作用的影响很大。因此，通过选择合适的单体，可以获得具有疏水表面的低介电常数的聚酰亚胺。

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