Synthesis and characterization of novel poly(amide‐imide)s containing 1,3‐diamino mesitylene moieties

Abstract

A series of poly(amide‐imide)s were prepared using a new monomer, 1,3‐bis(trimellitimido)‐2,4,6‐trimethyl benzene (BTB), with four different diamines: 1,4‐phenylene diamine (PDA), 2,4‐diamino mesitylene (DAM), 2,2′‐dimethyl‐4,4′‐diamino biphenyl (DMDB), and 2,2′‐bis(trifluoromethyl)‐4,4′‐diamino biphenyl (TFDB). They were prepared by the condensation method in N‐methyl‐2‐pyrrolidinone (NMP) solvent using triphenyl phosphate and pyridine as condensing agents. The synthesized poly(amide‐imide)s were characterized by Fourier transform infrared and 1H NMR techniques. Films were prepared and characterized using DSC, thermogravimetric analysis (TGA), a prism coupler, and a film dielectric property analyzer. DSC measurement showed that the glass‐transition temperatures of the polymers were in the range of 259–327 °C. TGA analysis showed 5% weight loss, in the range of 472–514 °C. The refractive index varied from 1.6004 to 1.6586 in the following increasing order: BTB‐TFBM < BTB‐DAM < BTB‐DMDB < BTB‐PDA. For the poly(amide‐imide) films, the birefringence varied in the range of 0.0319–0.0580, in the following increasing order: BTB‐DAM < BTB‐TFBM < BTB‐DMDB < BTB‐PDA. The capacitance method showed that the dielectric constant of poly(amide‐imide) varied with the diamine structure; no difference was found by the optical method. © 2003 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 42: 137–143, 2004

Synthesis and liquid‐crystal‐aligning properties of novel aromatic poly(amide imide)s bearing n‐alkyloxy side chains

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Interfacial properties and thermal stability of modified poly(m‐phenylene isophthalamide) thin films

“…Poly(imino‐1,3‐phenyleneiminocarbonyl‐1,3‐phenylenecarbonyl) or poly( m ‐phenylene isophthalamide) (PMIA) is a high‐crystallinity fibrous polyaramid . The excellent thermo‐oxidative stability, high strength and high radiation resistance are some qualities that make this polymer desirable in coatings and membranes . The chemical inertia is also responsible for the poor interaction with many solvents and for the low adhesion to other materials, which raises difficulties to its ability in process…”

Modified poly(ether–imide–amide)s with pendent benzazole structures: Synthesis and characterization

“…If the pendent groups are carefully chosen, it is possible for one to promote solubility without impairing the thermal and mechanical properties to any great extent. The combination of these two structural modifications minimized the trade‐off between the processability and useful/positive properties, such as the solubility of aromatic PAIs 11–24…”