Construction and Characterization of Molecular Nonwoven Fabrics Consisting of Cross-Linked Poly(γ-methyl-l-glutamate)

Abstract

Molecular nonwoven fabrics in the form of ultrathin layer-by-layer (LbL) helical polymer films with covalent cross-linking were assembled on substrates by an alternate ester-amide exchange reaction between poly(γ-methyl L-glutamate) (PMLG) and cross-linking agent ethylene diamine or 4,4'-diamino azobenzene. The regular growth of helical monolayers without excessive adsorption and the formation of amide bonds were confirmed by ultraviolet-visible (UV-vis) spectrophotometry, quartz crystal microbalance (QCM), ellipsometry, and infrared reflection-absorption spectroscopy (IR-RAS) measurements. Nanostructures with high uniformity and ultrathin films with few defects formed by helical rod segments of PMLG were characterized by atomic force microscopy (AFM) and Kelvin probe force microscopy (KFM).

Self-assembled π-conjugated macromolecular architectures — A soft solution process based on Schiff base coupling

“…The diversity and controllability of a structure and correlations between function and structure are of interest at the nano-and mesoscale. Among the various methods, the Langmuir-Blodgett method [3,4] and the layer-by-layer method, [5,6] in which molecules are deposited onto substrates, are used as preparation methods for laminated ultrathin films, and these have received much attention because of the layered structures produced with relatively high precision at the molecular level. [7,8] Sophisticated crystalline nanomaterials that consist of highly regularized pores, metal-organic frameworks (MOFs), porous coordination polymers, [9] and covalent organic frameworks [10,11] have been aggressively researched for application in gas storage, separations, sensors, and catalysis etc.…”

Simultaneous Electrochemical Analysis of Hydrophilic and Lipophilic Antioxidants in Bicontinuous Microemulsion

“…An indium tin oxide (ITO) electrode − and a fluorinated nanocarbon film (F-ECR) electrode , were used as hydrophilic and lipophilic working electrodes, respectively. As pretreatment prior to use, the ITO electrodes were flushed with methanol and pure water, and the F-ECR electrodes were flushed with toluene.…”

Macromolecular and supramolecular chirality: a twist in the polymer tales

“…One method is layer‐by‐layer (LBL) deposition reported by Higuchi et al using helical polymers in the formation of a novel molecular non‐woven fabric. Poly( γ ‐methyl‐ l ‐glutamate) (PMLG) thin films were deposited on gold and indium tin oxide substrates, functionalized with amine groups with an LBL dip‐coating method (Fig.…”

“…Schematic showing generation of a chiral surface via LBL deposition . The dip‐coating procedure involved immersing the activated substrates alternately into PMLG in 1,1,1,3,3,3‐hexafluoroisopropanol solution (3.6 mg/25 mL ) and a crosslinker (ethylene diamine ( EDA ) or 4,4′‐diaminoazobenzene ( DAZB )) in methanol with rinsing and drying under nitrogen between each step.…”

“…The dip‐coating procedure involved immersing the activated substrates alternately into PMLG in 1,1,1,3,3,3‐hexafluoroisopropanol solution (3.6 mg/25 mL ) and a crosslinker (ethylene diamine ( EDA ) or 4,4′‐diaminoazobenzene ( DAZB )) in methanol with rinsing and drying under nitrogen between each step. (Reprinted with permission from Higuchi et al . Copyright 2013 American Chemical Society.…”