Synthesis and Characterization of New Adhesion Promoter for Grafting Conducting Polymer on Oxide Substrate

Abstract

For grafting polypyrrole layers on oxidic substrates, the synthesis and characterization of a new adhesion promoter 11-(pyrrol-3-yl) undecyl trimethoxysilane (PyTMS) were described in this article. The oxidation potential of PyTMS was determined by cyclic voltammetry. The grafting behavior of such an adhesion promoter on oxidized surface and chemical deposition of polypyrrole over the modified oxidized surface were studied. The adsorbed layer on the oxidized substrates thus formed was determined by both contact angle measurements and X-ray photoelectron spectroscopy. Chemical polymerization of terminal pyrrole moieties on such substrates yielded adhesive polypyrrole films, and SEM image showed that the morphology of the polypyrrole films was influenced by the experimental conditions.

Application of chemically synthesized conducting polymer-polypyrrole as a carbon dioxide gas sensor

“…The electrons in -bonds form the backbone of the chain, dominating the mechanical properties of the polymer. Due to the -orbital overlap of neighboring molecules of the conjugated structure, the -electrons delocalize along the entire chain, which provide their semiconducting and conducting properties [29]. In doped PPy, a positive charge and an unpaired electron associated with a quoinoid structure are formed as a result of removal of an electron from a polymer chain [30], since CO 2 has two lone pair of electrons with -type C O bindings [31].…”

A new solventless process to hydrophobize silica powders in fluidized beds

“…It was established theoretically and experimentally that some molecules are not perpendicularly grafted on the surface but are dimly tilted40 (Figure 8). The tilt angle ( β ) is dependent on reagent grafting density, grafted layer thickness, alkyl chain length, and leaving groups numbers 41. Considering that ODTCS grafting density is not presumably identical on each point, by tilting its alkyl chain ODTCS molecule can reach the neighboring groups and react with through lateral SiOSi bonds (self‐assembling).…”

“… Schematic pattern of well‐ordered ODTCS SAM (a) and well‐ordered ODTCS SAM with β tilt angle (b) grafted on flat silica surface (Adapted from Cai41). [Color figure can be viewed in the online issue, which is available at www.interscience.wiley.com.…”

Improvement of adhesion and continuity of polypyrrole thin films through surface modification of hydrophobic substrates

“…These adhesion promoter molecules are appropriately functionalized organic molecules which allow anchoring of the polymer molecules on the substrate surface. For example, the adhesion promoter molecules like 3‐((pyrrol‐1yl) propyl trimethoxysilane, 6‐(pyrrol‐1‐yl)‐ n ‐hexyl trichlorosilane, and other pyrrole substituted organosilane monolayers consist of an adhesive group to the substrate, an alkyl spacer, and a terminal pyrrole group, the last acting as nucleation sites of PPy films with good adhesion. Many authors have also proposed plasma treatment of the substrates as an alternative to increase the adhesion between the substrate and conducting polymer .…”