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Low dielectric constant polyimides derived from 1,3‐bis(4‐aminophenyl)adamantane
Author(s) -
Chern YawTerng,
Shiue HannChyan
Publication year - 1998
Publication title -
macromolecular chemistry and physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.57
H-Index - 112
eISSN - 1521-3935
pISSN - 1022-1352
DOI - 10.1002/(sici)1521-3935(19980601)199:6<963::aid-macp963>3.0.co;2-i
Subject(s) - adamantane , dielectric , polymer chemistry , polymer science , materials science , constant (computer programming) , chemistry , organic chemistry , computer science , optoelectronics , programming language
This work describes the synthesis of new adamantane‐based polyimides by reaction of 1,3‐bis(4‐aminophenyl)adamantane ( 4 ) with various aromatic tetracarboxylic dianhydrides ( 5 ). The films have low dielectric constants ranging from 2.76 to 2.92. The poly(amic‐acid)s 6 have inherent viscosities of 0.98∼1.42 dL/g. The polyimide 7 d is soluble in o ‐chlorophenol, m ‐cresol, chloroform and cyclohexanone. The inherent viscosity and number‐average molecular weight of polyimide 7 d is 0.61 dL/g and 45 000, respectively. The films from 7 have tensile strengths of 69.7∼110.8 MPa, elongation to breakage values of 2.1∼11.3%, and initial moduli of 2.0∼2.3 GPa. Dynamic mechanical analysis (DMA) reveals that most polyimides 7 have two transitions. However, another subglass transition appears at 300°C in the extremely rigid polyimide 7 a . The glass transition temperatures of most polyimides 7 , except 7 e and 7 f , exceed 360°C according to DMA and DSC.