Dielectric Spectroscopy of Reactive Network-Forming Polymers

Mijović, Jovan

doi:10.1007/978-3-642-56120-7_9

Cited by 23 publications

(20 citation statements)

References 103 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Interestingly, in the composites with higher filler loadings (3 and 4 wt%), the decreased T g caused the α relaxation to shift towards lower temperatures and to merge with the β relaxation, forming a broad αβ relaxation. Similar behavior has been observed by dielectric relaxation spectroscopy on the curing kinetics [50, 51]. The β mode was found to weakly depend on the curing degree of the epoxy network, whereas the dynamics of the α relaxation become faster at low curing degrees and merge with the local β relaxation.…”

Section: Resultssupporting

confidence: 78%

Physical properties of epoxy resin/titanium dioxide nanocomposites

Polizos

Tuncer

Sauers

et al. 2010

Polymer Engineering & Sci

View full text Add to dashboard Cite

A polymeric nanocomposite system (nanodielectric) was fabricated, and its mechanical properties were determined. The fabricated nanocomposite was composed of low concentrations of monodispersed titanium dioxide (TiO2) nanoparticles and an epoxy resin specially designed for cryogenic applications. The monodispersed TiO2 nanoparticles were synthesized in an aqueous solution of titanium chloride and polyethylene glycol and subsequently dispersed in a commercial‐grade epoxy resin (Araldite® 5808). Nanocomposite thin sheets were prepared at several weight fractions of TiO2. The morphology of the composites, determined by transmission electron microscopy, showed that the nanoparticles aggregated to form particle clusters. The influence of thermal processing and the effect of filler dispersion on the structure–property relationships were identified by differential scanning calorimetry and dynamic mechanical analysis at a broad range of temperatures. The effect of the aggregates on the electrical insulation properties was determined by dielectric breakdown measurements. The optical properties of the nanocomposites and their potential use as filters in the ultraviolet–visible (UV–vis) range were determined by UV–vis spectroscopy. POLYM. ENG. SCI., 2011. © 2010 Society of Plastics Engineers

show abstract

Section: Resultssupporting

confidence: 78%

Physical properties of epoxy resin/titanium dioxide nanocomposites

Polizos

Tuncer

Sauers

et al. 2010

Polymer Engineering & Sci

View full text Add to dashboard Cite

show abstract

“…Other studies that used DS had applications on monitoring under microgravity,330 electrobeam curing process,331 reactive network‐forming polymers,332 conversion of the batch solution copolymerization of MMA/BA,333 real‐time cure photopolymerization,334 poly(vinyl chloride) (PVC) melt viscosity during extrusion processes,335, 336 nylon‐11 and its exfoliated silicate nanocomposite extrusion compounding using an on‐line dielectric sensor,337, 338 polymerization kinetics of polypyrrole339 and real‐time monitoring of low‐viscosity resins used in the coating industry 340…”

Section: On‐line Sensors For Polymer Property Trajectory Monitoringmentioning

confidence: 99%

A Critical Overview of Sensors for Monitoring Polymerizations

Fonseca

Dubé

Penlidis

2009

Macro Reaction Engineering

View full text Add to dashboard Cite

The available on‐line and in‐line sensor technologies developed for polymerization reactors from 1990 until today are discussed and critically reviewed. About 600 references are included, which evidence the growth in sensor technology in the last two decades. Sensors for operational parameters in polymer reactors (i.e. temperature, pressure, level and flow) as well as sensors for polymer property monitoring (i.e. calorimetry, chromatography and spectroscopy, among others) are included. Complementary topics such as state estimation, multivariate statistical methods, fault diagnosis techniques and optimal sensor selection and location are briefly covered.

show abstract

“…This technique allows the determination of the surface chemical composition of a given sample and other properties related to the structure and chemical environment in which the atom lies within the solid and, in the case of membranes, it is commonly used to study chemical changes in polymer matrix [13,14]. Impedance spectroscopy (IS) measurements were performed for electrical characterization of dry IL-doped membranes by analyzing the impedance plots and using equivalent circuits as models [15][16][17][18]. Moreover, a comparison of a characteristic electrochemical parameter (H + transport number) obtained from membrane potentials measured with HCl-aqueous solutions through wet Nafion/BMIM + doped and original Nafion membranes is also presented.…”

Section: Introductionmentioning

confidence: 99%

Chemical Surface, Thermal and Electrical Characterization of Nafion Membranes Doped with IL-Cations

et al. 2014

View full text Add to dashboard Cite

Surface and bulk changes in a Nafion membrane as a result of IL-cation doping (1-butyl-3-methylimidazolium tetrafluoroborate or BMIM + BF 4 and phenyltrimethylammonium chloride or TMPA + Cl − ) were studied by X-ray photoelectron spectroscopy (XPS), contact angle, differential scanning calorimetry (DSC) and impedance spectroscopy (IS) measurements performed with dry samples after 24 h in contact with the IL-cations BMIM + and TMPA + . IL-cations were selected due to their similar molecular weight and molar volume but different shape, which could facilitate/obstruct the cation incorporation in the Nafion membrane structure by proton/cation exchange mechanism. The surface coverage of the Nafion membrane by the IL-cations was confirmed by XPS analysis and contact angle, while the results obtained by the other two techniques (DSC and IS) seem to indicate differences in thermal and electrical behaviour depending on the doping-cation, being less resistive the Nafion/BMIM + membrane. For that reason, determination of the ion transport number was obtained for this membrane by measuring the membrane or concentration potential with the samples in contact with HCl solutions at different concentrations. The comparison of these results with those obtained for the original Nafion membrane provides information on the effect of IL-cation BMIM + on the transport of H + across wet Nafion/BMIM + doped membranes. OPEN ACCESSAppl. Sci. 2014, 4 196

show abstract

Dielectric Spectroscopy of Reactive Network-Forming Polymers

Cited by 23 publications

References 103 publications

Physical properties of epoxy resin/titanium dioxide nanocomposites

Physical properties of epoxy resin/titanium dioxide nanocomposites

A Critical Overview of Sensors for Monitoring Polymerizations

Chemical Surface, Thermal and Electrical Characterization of Nafion Membranes Doped with IL-Cations

Contact Info

Product

Resources

About