Poly(azomethine‐imide)s containing siloxane moities: Optical, thermal, mechanical, and morphological properties

Abstract

ABSTRACTA new series of poly(azomethine‐imide)s having siloxane moities in backbone was prepared using different dianhydrides.Thermal, optical, and morphological properties of these polymers were clarified. Also, bulky CO and CF3 group effects and meta or para‐substituted aldeyhde effects on the mentioned properties were evaluated. The structural characterization of poly(azomethine‐imide)s was carried out using a FT‐IR spectroscopy. The optical properties of the polymers were performed via an UV–Vis spectrophotometer. Optical band gap of the poly(imide)s containing azomethine was calculated between 2.20 and 2.33 eV. Thermal behavior of poly(azomethine‐imide)s was also studied using TG‐DTA, DSC, and DMA techniques. The onset degradation temperature and percentage char values of the polyimides were found in the range from 429 to 545 °C and 22 to 35%, respectively. Thermal stability results demonstrated that benzophenone bearing poly(azomethine‐imide)s have higher onset temperature, percentage char, and the glass transition temperature than poly(azomethine‐imide)s derived from hexafluoroisopropylidene. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2020, 137, 48364.