Graphene Oxide (GO) as Stabilizer for Preparing Chirally Helical Polyacetylene/GO Hybrid Microspheres via Suspension Polymerization

Abstract

Hybrid materials consisting of polymers and graphene are gathering ever-growing interest. This article reports a novel methodology for preparing chirally helical polyacetylene/graphene hybrid microspheres (MPs) via suspension polymerization in which graphene oxide (GO) or alkynylated GO (MGO) serves as a sole stabilizer. Such polymerizations show remarkable advantages in circumventing the difficulties in usual suspension polymerizations and especially in directly providing clean hybrid MPs. Scanning electron microscopy (SEM), Raman spectra, and electron dispersive spectroscopy indicate that graphene sheets cover the MPs through physical interaction (GO) or covalent bonds (MGO). The hybrid MPs are also characterized by Fourier-transform infrared spectroscopy (FT-IR), X-ray photoelectron spectroscopy, and thermogravimetric analysis. Circular dichroism spectra demonstrate that the polymer chains constituting the MPs adopt predominantly one-handed helices, endowing the MPs with intriguing optical activity. The established strategy opens a new approach for preparing hybrid MPs constructed by acetylenic polymers and GO.

Chiral Graphene Hybrid Materials: Structures, Properties, and Chiral Applications

“…To solve the limitation, the same group prepared a series of chiral hybrids starting from helical polyacetylenes and graphene, in which the ingredients were connected via covalent bonding. The prepared chiral materials include 1) chiral hybrid particles prepared by suspension polymerization using GO as stabilizer; [ 178 ] 2) chiral monolithic adsorbent prepared by solution polymerization; [ 176 ] 3) chiral helical polymer chains grafted on GO in which the polymer can reversibly undergo conformational transformation between extended free chains and particles, bio‐imitating jellyfish. [ 179 ] These investigations remarkably expand the types of the chiral materials from irregular, bulky morphology formed via solution polymerization to the ones possessing regular and hierarchical structures formed from suspension polymerization and co‐precipitation processes.…”

“…In addition, nano‐ and microscaled chiral particles have been prepared using graphene nano‐ and microsheets. [ 178,180,182 ] The chiral hybrid materials show enantioselectivity in chiral separation processes, e.g., in inducing enantioselective crystallization. Considering the advantages of nano‐ and microscaled architectures, graphene based chiral nano‐ and micromaterials are interesting both in nanofibrous and in particulate morphology. 3)Theoretical simulation.…”

Graphene Oxide–Crospolyvinylpyrrolidone Hybrid Microspheres for the Efficient Adsorption of 2,4,6-Trichlorophenol

“…,model 2 (16) where q i,exp and q i,model are the adsorption capacity measured and modeled, respectively. q ̅ i,exp is the average of q i,exp values, n is the number of experimental data, and p is the number of parameters of the fitting model.…”

“…Graphene oxide (GO) has attractive properties, such as high surface area, abundant surface functional groups, and good dispersibility in solvents, which provide ample possibilities to interact with metal ions, polymers, and bio-macromolecules. − For example, GO can be used to stabilize polymerization, , improve the mechanical and chemical stability of polymers, , and attain excellent shape memory properties . GO has been demonstrated as an excellent adsorbent for dyes, , heavy metal ions, and other hazardous chemicals. − However, many challenges still need to be overcome to achieve full use of the adsorption properties of GO.…”

Facile Synthesis of Helical Rod–Coil Block Polymers by the Combination of ATRP and Pd(II)‐Initiated Isocyanides Polymerizations

“…In living system, DNA, proteins, and other biological macromolecules support the biodiversity based on their splendid helical structures . Recently, helical structure has been widely investigated aiming at exploring the miraculous architectures and functions . Inspired by nature materials, the goal to build artificial macromolecular structure with stable helix is still a prominent challenge to scientists intending for further development and applications .…”