Periodic Functionalization of Graphene‐Layered Alumina Nanofibers with Aromatic Thermosetting Copolyester via Epitaxial Step‐Growth Polymerization

Abstract

In situ epitaxial step‐growth polymerization driven interfacial functionalization of aromatic thermosetting copolyester (ATSP) with multilayered graphene wrapped alumina nanofiber surface is reported. During a thermal condensation polymerization, ATSP dip‐coated fiber strands develop a nanohybrid shish–kebab structure with periodically assembled and off‐surface grown micrometer‐scale lamella ATSP domains. A mechanism combining the Plateau–Rayleigh instability, the Marangoni effect, and the epitaxial growth phenomena is proposed to elucidate controlling parameters in the process. X‐ray diffraction measurements clearly demonstrate the formation of a mesomorphic lamella phase not present within either the neat ATSP or pristine fiber samples. Results of solid‐state nuclear magnetic resonance and thermogravimetric analysis reveal the development of an interfacial coupling between the graphene‐coated ceramic nanofibers and the ATSP matrix.

Interfacial liquid crystalline mesophase domain on carbon nanofillers in aromatic thermosetting copolyester matrix

“…The domain lay within a few microns outside of the GNP agglomeration site while being discerned through a sharp contrast to the brighter surrounding matrix with different electronic properties. Uniquely, the LC phase contour precisely mimicked the tortuous outline of the GNP aggregate region, which emphasizes the presence of a local surface induced orientation mechanism . Additionally, cross‐polarized optical microscopy images revealed birefringence patterns emanating from the GNP site over the interface region [Figure (b)].…”

Biyosentez yöntemi ile üretilen GO:Se nanopartiküllerinin üretimi ve karakterizasyonu ve GO:Se nanopartikülleri kullanılarak geliştirilen Ag / GO: Se / p-Si cihazının akım-gerilim özellikleri

“…For the last days, researchers have begun to study the graphene as a favor material due to its potential technological applications owing to its excellent optical, electrical, structural and mechanical properties [Bakir et al, 2017]. Many researchers have studied on the graphene oxide (GO) named from the oxide form of the graphene and they have investigated this material in detail since it has a tunable band gap, governable conductivity close to insulators, and high transmittance Kang et al, 2013].…”

Glass transition broadening via nanofiller‐contiguous polymer network in aromatic thermosetting copolyester nanocomposites

“…13,15,18 Chemical characterization of ATSP backbone chains exhibited the formation of a robust covalent coupling with the nanoparticles enabled through in situ polymerization reaction wherein precursor oligomers and nanofiller particles were concurrently present. [19][20][21] Supported by further enhancements in thermophysical properties, ATSP chains crosslinked and incorporated with the nanofiller particles forming a nanofiller-conjugated nanocomposite morphology, which extensively modified the backbone configuration of the nanocomposites.…”