| 摘要 |
A polyimide for optical communications, which is expressed by the formula (1), a method of preparing the same, and a method of forming multiple polyimide films using the polyimide, wherein the formula (1) is given byX1, X2, X3, A1, A2, B1, B2, B3, D1, D2, E1, E2, Y1, Y2, Y3, Y4, Y5, Y6, Y7, and Y8, are independently selected from the group consisting of hydrogen atom, halogen atom, alkyl group, halogenated alkyl group, aryl group and halogenated aryl group; Z is a simple chemical bond or selected from the group consisting of -O-, -CO-, -SO3-, -S-, -(T)m-, -(OT)m- and -(OTO)m-, wherein T is alkylene or arylene group substituted by at least one of halogen atom and halogenated alkyl group and m is an integer from 1 to 10; and n is an integer from 1 to 39. Because the polyimide expressed by the formula (1) has a lower birefringence than a common polyimide used as a material for optical waveguiding, a problem associated with the dependency of optical characteristics on polarization can be solved. Also, the solubility of the polyimide in an organic solvent is lowered, so that the occurrence of cracks in a polyimide layer can be avoided in the case of forming multiple polyimide films.
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