PHYSICOCHEMICAL PROPERTIES OF RANDOM TERN ARY ALIPHATIC COPOLYAMIDE

The structure and thermodynamic characteristics of random aliphatic co polyamide based on caprolactam and hexamethylenediamine adipate and se bacate are investigated by roentgenography, polarization microscopy, l ight scattering, differential thermal analysis, differential scanning calorimetry, and thermomechanical analysis. The phase diagrams of the copolyamide solutions in ethanol and N-methyl pyrrolidone are obtained . Gel transition in such systems is studied by calorimetry. A comparis on of the structure and characteristics of gels formed of solution and block copolyamide is performed using polarization microscopy, differe ntial thermal analysis, and differential scanning calorimetry. The cop olyamide is found to have extremely low crystallinity, which neverthel ess substantially governs its characteristics. The experimental result s are discussed in terms of microcrystallites formed due to interchain hydrogen bonding present in the structure of copolyamide.