Characterization of Electroconductive Blends of Poly(HEMA-co-PEGMA-co-HMMA-co-SPMA) and Poly(Py-co-PyBA)

Abstract

Electroconductive hydrogels (ECH) prepared as blends of UV-cross-linked poly(hydroxyethylmethacrylate) [p(HEMA)]-based hydrogels and electropolymerized polypyrrole (PPy) were synthesized as coatings on microlithographically fabricated interdigitated microsensor electrodes (IMEs) and microdisc electrode arrays (MDEAs). Hydrogels were synthesized from tetraethyleneglycol diacrylate (TEGDA), hydroxyethylmethacrylate (HEMA), polyethyleneglycol monomethacrylate (PEGMA), N-[tris(hydroxymethyl)methyl]-acrylamide (HMMA), and 3-sulfopropyl methacrylate potassium salt (SPMA) to produce p(HEMA-co-PEGMA-co-HMMA-co-SPMA) hydrogels. The conductive polymer was synthesized from pyrrole and 4-(3'-pyrrolyl)butyric acid by electropolymerization within the electrode-supported hydrogel. ECH films produced with different electropolymerization charge densities were investigated using cyclic voltammetry, electrical impedance spectroscopy, differential scanning calorimetry (DSC), and thermal gravimetric analysis (TGA). Polymer morphology was studied by SEM. The ECH demonstrated the desired characteristics of high electrical conductivity (low impedance), as well as high thermal stability compared to pure hydrogel. Signal enhancement was achieved by modifying the surface of an MDEA biotransducer with the ECH, with a 10-fold increase in the voltammetric current response associated with the ferrocene monocarboxylic acid (FcCO(2)H) redox reaction.

Dynamics of glass-forming liquids. XVI. Observation of ultrastable glass transformation via dielectric spectroscopy

“…Ultrastable IMC glass films were prepared by means of PVD. Details on the deposition procedure onto the interdigitated electrode (IDE) cells (ABTECH Scientific, Inc.) 40,41 have been reported previously. 42 The base pressure inside the PVD chamber was 5 × 10 −8 torr.…”

Bioactive Electroconductive Hydrogels: The Effects of Electropolymerization Charge Density on the Storage Stability of an Enzyme-Based Biosensor

“…It has previously been established that electropolymerization of Py within electrode-supported hydrogels is initiated at the electrode-hydrogel interface and progresses outwards, being more dense at the electrode-hydrogel interface and progressively less towards the hydrogelsolution interface [23]. The bioactivity of PPy/GOx/poly(HEMA)-based hydrogel was investigated at two charge densities, 1.0 and 10.0 mC/cm 2 .…”

Influence of Dopant Ions on the Properties of Conducting Polyacrylamide/Polyaniline Hydrogels

“…Conducting polymer hydrogels have emerged as an important area of research interest because of the special and significant advantages it offers [1][2][3] , making their prospect for technological applications [4,5] . Hydrogels are three dimensionally cross-linked hydrophilic network systems which can absorb large amount of water [6] .…”