Dimensionally stable polyimide copolymers for microelectronics applications

✍ Scribed by Catharine C. Fay; Anne K. St. Clair

• Book ID: 101256879
• Publisher: John Wiley and Sons
• Year: 1998
• Tongue: English
• Weight: 157 KB
• Volume: 69
• Category: Article
• ISSN: 0021-8995
• DOI: 10.1002/(sici)1097-4628(19980919)69:12<2383::aid-app10>3.0.co;2-z

✦ Synopsis

Polyimides are finding increased applications in microelectronics due to their high thermal stability, good chemical resistance, good adhesion, low moisture absorption, good mechanical properties, and low coefficient of thermal expansion (CTE). Four series of random copolyimides were synthesized and characterized for potential application as encapsulants, stress-relief layers, and interlevel dielectrics. Several candidates exhibited good combinations of physical and mechanical properties with inherent viscosities from 1.21 to 1.42 dL/g, T g 's ranging from 251 to 277ЊC, 10% weight loss temperatures between 503 and 527ЊC, and CTEs ranging from 33 to 39 ppm/ ЊC. Mechanical properties at room temperature for the best candidates included tensile strengths of 17.8-21.3 ksi, moduli between 388 and 506 ksi, and elongations of 11-43%. Moisture absorption for these copolyimides ranged between 0.85 and 1.38 wt %.