Ebrahim Abouzari-Lotf - Heat-resistant and soluble fluorinated poly(amide imide)s based on non-coplanar ortho-linked diimide-dicarboxylic acid

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      Abouzari-Lotf, E., Shockravi, A., Javadi, A. 96 (5)   1022-1028

      Abstract: A series of novel fluorinated   heat-resistant poly(amide imide)s (PAIS) based on non-coplanar   diimide-diacid monomer (DIDA) were synthesized and characterized.   The poly(amide imide)s were obtained in high yields and possessed   inherent viscosities in the range of 0.47-0.91 dL g-1. All of the   polymers were amorphous in nature, showed outstanding solubility   and could be readily soluble in common organic solvents such as   N,N-dimethylacetamide, N-methyl-2-pyrrolidinoned, dimethyl   sulfoxide, N,N-dimethylformamide, pyridine and tetrahydrofuran.   Glass transition temperatures were in the range of 221-263 °C, as   determined by differential scanning calorimetry. Degradation   temperatures for 10% weight loss occurred all above 520 °C and   char yields was more than 50% at 700 °C in nitrogen atmosphere.   Moreover, these PAIs possessed low refractive indexes (n =   1.58-1.59), birefringence (Δn = 0.008-0.013), and dielectric   constants (ε ≈ 2.5) due to the trifluoromethyl pendent groups and   ortho-catenated aromatic rings that interrupt chain packing and   increase free volume. © 2011 Elsevier Ltd. All rights reserved.

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