Preparation and characterization of electropolymerized poly(N-substituted maleimide-co-styrene) coatings on copper substrates

✍ Scribed by Jeng-Li Liang; James P. Bell; J. O. Iroh; Ashit Mehta

• Book ID: 102737812
• Publisher: John Wiley and Sons
• Year: 1993
• Tongue: English
• Weight: 827 KB
• Volume: 48
• Category: Article
• ISSN: 0021-8995
• DOI: 10.1002/app.1993.070480311

✦ Synopsis

Poly (N-substituted maleimide-co-styrene) copolymer films were electropolymerized onto copper substrates as possible candidates for electronic applications. The N-substituted moieties that were investigated include phenyl, 3-carboxyphenyl, and 4-carboxyphenyl. Uniform coatings of 25 pm or more thickness were successfully applied using each of the three N-substituted maleimides. The thickness was controlled by manipulating the monomer concentration, current density, and reaction time. Not only did the 3-and 4-carboxyphenylmaleimide (CMI) /styrene copolymers have high glass transition temperatures (220°C) and fairly good thermal stability ( -430"C), but they also have rather low dielectric constants (2.55 for 4-CMI/styrene), comparable to those of polyimides. Polymerization of the coatings was observed by in-situ Fourier transform infrared spectroscopy (FTIRS) , using a special cell that made the observation of the polymer structure development possible. It was found by FTIRS that all three monomers, when used with styrene, produced alternating copolymers.