Synthesis and Characterization of Aromatic Poly(azomethine ether)s with Different meta- and para-Phenylene Linkage Contents

• Published in: Fibers and polymers Vol. 21; no. 2; pp. 238 - 244
• Main Authors: Choi, Young Chul, Kim, Min Su, Ryu, Kyoung Moon, Lee, Sang Hoon, Jeong, Young Gyu
• Format: Journal Article
• Language: English
• Published: Seoul The Korean Fiber Society 01.02.2020; Springer Nature B.V; 한국섬유공학회
• Subjects: Carbon fiber reinforced plastics; Chemistry; Chemistry and Materials Science; Fluorescence; Glass transition temperature; Infrared spectroscopy; Mechanical properties; Molecular structure; Optical properties; Optoelectronics; Polyazomethines; Polycondensation reactions; Polymer Sciences; Temperature; Thermal stability; Thermomechanical properties; 섬유공학; Thermo-mechanical property; Poly(azomethine ether)s; Optical property; Polycondensation; Thermal stability
• ISSN: 1229-9197; 1875-0052
• DOI: 10.1007/s12221-020-9690-5

New aromatic poly(azomethine ether)s (PAMEs) bearing different meta- and para-phenylene linkage ratios in the main chains were synthesized via solution polycondensation reactions of terephthalaldehyde and/or isophthaldehyde with 3,4′-diaminodiphenyl ether. The molecular structures, thermal stability, thermo-mechanical and optical properties of the synthesized PAME homopolymers and copolymers were investigated by using FT-IR, TGA, DMA, and UV-visible/ fluorescence spectroscopy, respectively. The synthesized PAMEs were characterized to be thermally stable up to ~400 °C under nitrogen or air atmosphere and to have high char residues of above 55 % at 800 °C under nitrogen condition. The DMA data revealed that the glass transition temperatures of PMAEs are in the range of 150–200 °C, depending on the relative contents of meta- and para-phenylene linkages. The maximum absorption wavelength of transparent yellowish PAME films was detected at 410±10 nm. In addition, all PAME films exhibited a broad visible emission band at 500–800 nm and two infrared emission bands at 800–1400 nm. The synthesized PAMEs with high thermal stability and thermo-mechanical performance can be thus used as functional polymeric materials for technical fibers, optoelectronic films, and carbon fiber precursors.