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- Title
Synthesis and properties of poly(ester imide) copolymers from 3,3',4,4'-biphenyltetracarboxylic dianhydride, 2,2'-bis (trifluoromethyl)benzidine, and 4-aminophenyl-4'- aminobenzoate.
- Authors
Hao Zheng; Dirong Gong; Yuanyuan Pang; Chun Tian; Zhen Wang; Jingling Yan
- Abstract
A series of poly(ester imide) (PEsI) copolymers were synthesized using 3,3',4,4'-biphenyltetracarboxylic dianhydride (4,4'-BPDA), 2,2'-bis(trifluoromethyl) benzidine (TFMB), and 4-aminophenyl-4'-aminobenzoate (APAB) as the monomers. Wide-angle x-ray diffraction results revealed that the average interchain distances of these polymers ranged from 4.6 to 5.7 Å, increasing with the increase of TFMB contents. PEsI-0.3 and PEsI-0.4 exhibited a glass transition temperature (Tg) of 445 and 455°C, respectively, while no distinctive Tg was observed for the PEsI copolymers when the APAB content was >50 mol%. The coefficients of thermal expansion (CTE) of these PEsI copolymers ranged from 3.8 to 24.2 ppm K-1, increasing with the increase of TFMB contents. The PEsI copolymers exhibited a modulus of 5.7-7.8 GPa, a tensile strength of 282-332 MPa, and an elongation-at-break of 10.2%-23.3%. Furthermore, these copolymers exhibited a dielectric constant of 2.53-2.76, and a low dissipation factor (Df) of 0.0026-0.0032 at 10 GHz in dry state. Because of their excellent combined properties, these PEsI copolymers are promising candidates as dielectric substrate materials for the applications in next generation flexible printed circuit boards operating at high frequencies.
- Subjects
BENZOATES; FLEXIBLE printed circuits; BENZIDINE; GLASS transition temperature; DIELECTRIC materials; PERMITTIVITY
- Publication
Journal of Applied Polymer Science, 2024, Vol 141, Issue 14, p1
- ISSN
0021-8995
- Publication type
Article
- DOI
10.1002/app.55182