Poly(4‐methoxyaniline) composites: Investigating structure–property relationship towards semiconducting applications

ABSTRACT Conjugated polymers are essential materials for the organic optoelectronic industry, serving a pivotal role in cutting‐edge technologies. In this study, we conducted an integrated characterization approach, including spectroscopic techniques coupled with X‐ray diffraction analysis to explore the structure–property relationship of poly(4‐methoxyaniline), commonly referred to as poly(p‐anisidine) or PPA, along with two distinct ceramic composites: PPA/α‐Al2O3 and PPA/Eu2O3. From powder X‐ray diffraction analysis, a triclinic unit cell in space group P1 is proposed, after the whole powder pattern decomposition (WPPD) refinement is employed for the semicrystalline regions of the polymeric phases. Fractal‐like structures are observed, following analysis of small‐angle X‐ray scattering (SAXS) data and scanning electron microscopy (SEM) from which we could infer the approximate sizes of the fractal clusters. Pure PPA displays a glass transition temperature (Tg) of approximately 80°C and an electrical conductivity slightly above 10−5 S/cm. In contrast, the composite materials do not exhibit a glass transition temperature but perform better in terms of crystallinity and thermal stability. PPA/Eu2O3 present conductivity enhancement exceeding tenfold, surpassing 10−4 S/cm. These findings provide the baseline for further explorations on the development of organic electronic devices and sensors. Organic semiconductors.