Synthesis and thermal properties of novel thermotropic aromatic-aliphatic homo- and copolyamides

✍ Scribed by Moriyuki Sato; Yoshifumi Manabe; Toshiharu Sasaki; Yushin Ohtomo; Fujio Komatsu

• Publisher: Elsevier Science
• Year: 1991
• Tongue: English
• Weight: 348 KB
• Volume: 27
• Category: Article
• ISSN: 0014-3057
• DOI: 10.1016/0014-3057(91)90240-o

✦ Synopsis

Novel high molecular-weight aromatic-aliphatic homo-and copolyamides were synthesized in high yields by direct polycondensation of 2,3,5,6-tetramethyl-l,4-diaminobenzene and m-phenylene diamine with eicosanedioic acid. The polymers were characterized by elemental analyses, FT-IR and carbon-13 NMR spectra. Their thermal properties were evaluated by means of TGA and DSC. Mesomorphic behaviour was checked by observation of optical texture with a polarizing microscope. m-Phenylene unit-rich polymers exhibit well-defined thermotropic liquid crystalline phases and have lower glass-transition temperatures.