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Original Articles

Synthesis and Characterization of Organosoluble Polyimides Containing Pyridyl Moiety with Ether Linkages

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Pages 1013-1022 | Received 01 Feb 2006, Accepted 01 Mar 2007, Published online: 14 Jun 2007
 

Two novel diamine monomers, bis(4‐amino‐3,5‐dimethylphenyl)‐3‐pyridyl methane and bis(4‐aminophenoxy‐3,5‐dimethylphenyl)‐3‐pyridyl methane were synthesized. A series of pyridine containing aromatic polyimides derived from the diamines were synthesized through a typical two‐step polymerization method. Most of the polymers show good solubility in NMP, DMAc, DMF, DMSO and CHCl3 at room temperature. These polyimides exhibit Tg in the range of 249–317°C and 10% wt loss (T10) takes place in the range of 474–564°C in N2 and 469–558°C in air. The polymers have tensile strength in the range of 88–96 MPa, elongation at break in the range of 8.5–12.5% and tensile modulus in the range of 1.5–2.1 GPa. These polyimides also have low dielectric constant (3.26–3.64 at 1 KHz and 3.24–3.61 at 10 KHz) and low moisture absorption (0.42–0.89%).

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