Synthesis and characterization of mixed aromatic-aliphatic polyamides

Abstract

<span style="font-size:16.0pt;mso-bidi-font-size:12.0pt" lang="EN-IN">Polyamide of benzidine/adipic acid (PA-1) and that of terephthalic acid/hexamethylene diamine (HMDA) (PA-2) have been synthesised by polycondensation method via acid chloride route. The polymers have been characterised by elemental analysis, FTIR, solid state NMR, TGA, DSC, WAXD, viscosity studies and optical polarized microscopy. The activation energy associated with the decomposition has been determined using Broido's method. Melting point and enthalpy change <span style="mso-bidi-font-style:italic">(∆<i>H</i>)<i> </i>were evaluated by DSC analysis whereas crystallinity of polymer samples are determined by WAXD. The viscosity behaviour of PA-I in DMAC + 5% LiCI and PA-2 in <i style="mso-bidi-font-style:normal">m</i>-cresol and also in methanol/<i style="mso-bidi-font-style:normal">m</i>-cresol mixed solvents of various ratios at different temperatures have been studied. The intrinsic viscosity [η] shows significant effect with respect to both temperature and mixed solvents. The voluminosity <span style="mso-bidi-font-style:italic">(<i>V_E</i>) and shape factor <span style="mso-bidi-font-style:italic">(v)<i> </i>have also been computed from the viscosity data.

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