Abstract

Driven by the emerging development of transparent and flexible electronics, colorless polyimide (CPI) has been attracting much attention in recent years. As a key component for next generation electronics, CPI film will be well focused both on research and commercialization. In this chapter, we would like to provide a review and outlook to the field for the reference of scientists, engineers, and entrepreneurs. Topics being addressed are formulation/design, synthesis of the resin, fabrication, and characterization of the CPI films, as well as trends of the film application for the next generation of electronics. Attention will also be given to the current stage of manufacturing of CPI monomers and resin, industrial production of CPI films, etc.

Highlights

  • Polyimides (PIs) are one of the most important classes of polymers with high mechanical properties, thermal stability, high temperature resistance, good chemical resistance, and dielectric features [1, 2]

  • The lower optical transmittance of conventional PI is caused by the formation of intra- and intermolecular charge transfer complex (CTC) originated from their conjugated structures [8, 9]

  • The basic principle to increase the transparency of colorless polyimide (CPI) is to avoid or reduce the conjugated units and suppress the CTC

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Summary

Introduction

Polyimides (PIs) are one of the most important classes of polymers with high mechanical properties, thermal stability, high temperature resistance, good chemical resistance, and dielectric features [1, 2] Since their mass production in 1955 [3], they enjoy a superior role in the application of electronics, aerospace, automobile, and military fields for their excellent combined properties under harsh environment [4, 5]. Conventional colored PI films which have lower optical transmittance can’t fulfill the need of optical transparency in electronic devices, and a reliable colorless polyimide (CPI) is highly desired. As heat treatment in air will cause coloration, it is suggested that the film preparation should be under inert gas atmosphere or in vacuum by PAA route, the high temperature about 300–350°C will still affect the transparency.

The formulation of CPI
Fluorinated CPIs
Alicyclic CPIs
Noncoplanar colorless PIs
Other colorless PIs
CPI film production
Challenges of CPI for TaFEs
Findings
Balance of the desired properties of CPI film for TaFE applications
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