Chemical polymerization and Langmuir‐Blodgett techniques, 1. The polymerization of a monolayer of 2‐pentadecylaniline

Langmuir Film Polymerization of 1,22-Bis(2-aminophenyl)docosane: A Two-Dimensional Cross-linked Polyalkylaniline

“…The plot indicates that the polymerization rate increased with time early in the reaction, suggesting that autoacceleration occurred. This effect has been observed in the solution polymerization of aniline and in the Langmuir film polymerization of PDA. , The π− A isotherm of poly(BAD) had a pressure onset area of ca. 70 Å 2 molecule -1 or 35 Å 2 repeat unit -1 , while the onset area of poly(PDA) was 35 Å 2 repeat unit -1 (Figure ).…”

“…This communication presents the Langmuir film polymerization of a dipolar monomer, 1,22-bis(2-aminophenyl)docosane (BAD), which forms a 2-dimensional network polymer of polyalkylaniline. The surface behavior of BAD is presented and compared with that of the monopolar surfactant, 2-pentadecylaniline (PDA), which is routinely polymerized in Langmuir films. − …”

“…The surface pressure was held constant while the film area was monitored over time. In the case of aniline-type monomers, the area that a polymer repeat unit occupies at the interface is less than that of the monomer, making this a useful technique to monitor the reaction kinetics.…”

Polymer Nanosheets from Supramolecular Assemblies of Conjugated Linoleic Acid–High Surface Area Adsorbents from Renewable Materials

“…Chemical and mechanical exfoliation from bulk crystals with layered structures is a commonly utilized approach for generating graphene and TMDC 2D materials, in addition to chemical vapor deposition and wet chemical synthesis methods. , The extension of these methods to enable large area fabrication and facile manipulation of materials is a critical goal of current research. Fabrication of polymer nanosheets has been accomplished by polymerization of densely packed monomer − or polymer , monolayers at air–fluid interfaces, often produced using the Langmuir–Blodgett scheme, as well as by polymerization of solid surface-adsorbed monomers such as pyrrole. , While they are useful, particularly for in-place generation of functional polymer nanosheets in devices, as surface-based methods, these approaches are limited in their scalability.…”

Example of an organic reaction in a Langmuir film: Reduction of an amphiphilic ketone by NaBH4

“…Chemically initiated polymerizations of oriented monomers can be performed by just adding a catalyst or reagent in the subphase. Pyrrole monomers [1,2], derivatives of aniline [3][4][5][6][7][8], or vinyl monomers [9] have been polymerized in this way. In most of these studies, the reactions were followed by recording variations in the area per molecule at constant pressure or changes in surface pressure at constant area per molecule.…”