含氟嵌段聚酰亚胺共聚物的制备及其介电常数计算

Synthesis and Dielectric Constant Calculation of Fluorinated Polyimide Block Copolymer

通过顺序加料法制备了一系列不同氟含量聚酰亚胺,FT-IR、1H-NMR及GPC测试结果表明,所制备的聚合物为嵌段共聚物。Lorenz和Vogel介电常数计算公式主要用于均聚物介电常数的计算,通过对上述两计算公式进行相应变形处理,使之适用于计算嵌段共聚物的理论介电常数,并将其运用到所合成的嵌段型含氟聚酰亚胺模板聚合物的介电常数计算中,计算结果显示,Lorenz和Vogel介电常数变形公式计算所得的模板聚合物的介电常数与聚合物介电常数实测值具有较好的吻合性,能够有效指导低介电常数嵌段聚酰亚胺的设计与合成。

A series of fluorinated polyimide were synthesized by in situ sequence feeding chemical polymerization. FT-IR, ^1H-NMR and GPC were used to identify the synthesized copolymers and the results illustrate that the synthesized fluorinated polyimides are block copolymers. Lorenz and Vogel theories are usually used for calculating the dielectric constant of homopolymers, those dielectric constant calculation equations were modified through several steps in order to make them can be used to calculate the dielectric constants of block copolymers. After modification, those modified equations were used to calculate the dielectric constants of the synthesized fluorinated block copolymers, and the results show that the calculated dielectric constants of synthesized fluorinated polyimides are coincident with the measured values. It shows that the modified equations could be used in directing the design and synthesis of low dielectric polyimide block copolymers.