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Aromatic polyamides (PAs) are well-known thermally stable polymers with good chemical resistance and thermal stability, low flammability, and very good mechanical properties [13]. However, their limited solubility in most organic solvents and high melting and glass transition temperatures reduce their processability and restrict further applications. Numerous efforts have been made to improve the solubility and processability of aromatic PAs with retention of their high thermal stability. The incorporation of flexible chains into PA backbone, the use of meta-oriented monomers, synthesis of PAs with noncoplanar groups in the polymer chains, introduction of bulky side moieties into the polymer chains resulted in a number of structural modifications of the polymer backbone [14¨C18].
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