Structure/Properties Relationship of Anionically Synthesized Diblock Copolymers “Grafted to” Chemically Modified Graphene

Abstract

A novel approach to obtaining nanocomposite materials using anionic sequential polymerization and post-synthetic esterification reactions with chemically modified graphene sheets (CMGs) is reported. The anionically synthesized diblock copolymer precursors of the PS-b-PI-OH type were grafted to the chemically modified –COOH groups of the CMGs, giving rise to the final composite materials, namely polystyrene-b-poly(isoprene)-g-CMGs, which exhibited enhanced physicochemical properties. The successful synthesis was determined through multiple molecular characterization techniques together with thermogravimetric analysis for the verification of increased thermal stability, and the structure/properties relationship was justified through transmission electron microscopy. Furthermore, the arrangement of CMGs utilizing lamellar and cylindrical morphologies was studied in order to determine the effect of the loaded CMGs in the adopted topologies.

Catalytic Decomposition of Residual Ozone over Cactus-like MnO2 Nanosphere: Synergistic Mechanism and SO2/H2O Interference

“…The centered peaks at ∼3582 cm −1 were assigned to the O−H stretching modes from adsorbed H 2 O, two-coordinated OH species (i.e., a doubly bridging hydroxyl group), etc. 65,66 Accordingly, the associated interlayer water and adsorbed water were converted into highly active hydroxyl groups by ozone and active oxygen species, and then hydroxyl groups could participate in ozone decomposition, verifying the XPS results (section 3.5.2).…”

“…The broad weak band located at ∼3320 cm –1 could be ascribed to the extensional vibration of O–H groups from interlayer bound water, and the band at 1680–1610 cm –1 characterized the bending mode of adsorbed water. , As O 3 was injected, the above bands became weaker slowly, and the small band peaks at ∼3740 cm –1 correspond to the mono-coordinated hydroxyl groups (i.e., surface free hydroxyl). The centered peaks at ∼3582 cm –1 were assigned to the O–H stretching modes from adsorbed H 2 O, two-coordinated OH species (i.e., a doubly bridging hydroxyl group), etc. , Accordingly, the associated interlayer water and adsorbed water were converted into highly active hydroxyl groups by ozone and active oxygen species, and then hydroxyl groups could participate in ozone decomposition, verifying the XPS results (section ).…”

Graphene Oxide–Cytochrome c Multilayered Structures for Biocatalytic Applications: Decrypting the Role of Surfactant in Langmuir–Schaefer Layer Deposition

“…The isolation of graphene is considered as the cornerstone of research on two-dimensional (2D) nanomaterials, owing to its unique properties, such as high surface-to-volume ratio, high electrical and thermal conductivity, and exceptionally high tensile strength . These properties have directed the attention of many researchers toward exploring the applicability of graphene in various technological fields including nanoelectronics, conductive inks, transparent electrodes, gas separation, polymer nanocomposites, energy storage, and sensors . Nevertheless, the absence of hydrophilic functional groups in pristine graphene remains a persistent problem impeding its utilization in biomedical applications, which demand stable aqueous dispersions of hydrophilic biocompatible nanomaterials .…”