Skip to main content
U.S. flag

An official website of the United States government

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS
A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

Dielectric Spectroscopy During Extrusion Processing of Polymer Nanocomposites: a High Throughput Processing/Characterization Method to Measure Layered Silicate Content and Exfoliation

Published

Author(s)

Rick D. Davis, Anthony J. Bur, M M. McBrearty, Y E. Lee, Jeffrey W. Gilman, P R. Start

Abstract

Dielectric spectroscopy was conducted during extrusion processing of polyamide-6 (PA6) and layered silicate/polyamide-6 nanocomposites. Dielectric dispersion parameters were identified that appear sensitive to layered silicate concentration and degree of exfoliation. Specific to measuring layered silicate concentration is that the Maxwell-Wagner strength of dispersion, Δepsilon(mw) increases linearly with the % mass fraction layered silicate content. This relationship is independent of exfoliation resulting in nanomorphology-averaged Aepsilon(mw) values that reflect layered silicate concentration; i.e. 12,800 +/- 519 indicates 1.29% mass fraction of a layered silicate in PA6. The nanomorphology is primarily reflected in the Maxwell-Wagner characteristic relaxation frequency value, f(mw), where, for example, 80.4 +/- 5 Hz indicates a mixed intercalated/exfoliated nanomorphology. However, following the nanomorphology with thefts value can in some cases be complicated because different nanomorphologies can yield the same f(mw) value. In these cases we have found that there is a significant difference in the conductive resistance and segmental mobility of these polymers, as indicated by the sigma(DC) and f(alpha) values. For example, the intercalated and exfoliated nanocomposites have a f(mw) value of about 5.1 Hz, but the exfoliated nanocomposites have sigma(Dc) and f(alpha) values that are much larger than determined for the intercalated nanocomposites.
Citation
Plasma Processes and Polymers
Volume
45 No. 19

Keywords

&, (3-octylthiophene), (NEXAFS), (SANS), (SiOC), (multivariant), (stars, ultra-thin, viscosity, ., 12, 157, 2-D, 2-hydroxyethyl, 2888, 3-point, 4-roll, ?-hydroxymethylacrylate, AFM, AFM, Absorption, Absorption, Acid, Adhesion, Adhesive, Adhesives, Adhesives, Advanced, Amplified, Analysis, Angle, Apatite, Apparatus, Applications, Approach, Au, BARC, BaTiO3, BaTiO3, Backscattering, Barium, Beta-Relaxation, Biological, Biomaterials, Biomaterials, Biopolymers, Biopolymers, Bis-GMA, Blend, Blends, Blends, Boltzmann, Bonding, Brillouin, Building-Blocks, C, C.C., CTE, CVD, Calculus, Capacitance, Carbon, Cascade, CdS, Cement, Cements, Chemically, Chemistry, Cluster, Clustering, Coefficient, Combinatorial, Combinatorial, Comparison, Composites, Composites, Concentration, Condensed, Confocal, Constrained, Convergent-Growth, Cooperative, Copolymers, Coupling, Critical, Crystalline, Crystallization, Crystallization, DET, DETA, DMTA, DSC, DSC, Damage, Debye-Waller, Decomposition, Deformation, Demineralization, Dendrimer, Dendrimers, Dendrimers, Dental, Dentin, Determination, Diagram, Dielectric, Dielectric-Relaxation, Dielectrics, Diffusion, Diffusion, Dilute, Dilute-Solution, Directed, Distribution, Domain, Droplet, Durability, Durability, Dynamic, Dynamics, ESI, Effects, Electron, Electronic, Epoxy-Resins, Equations, Equilibrium, Extension, FIlms, FIlms, FT-IR, FTIR, Fatigue, Fiber, Fibers, Filled, Filler, Films, Films, First, Flory-Huggins, Fluorescence, Fomulations, Forces, Formation, Formulations, Fractional, Fragility, Functional, Functionality, G., Gelation, Gels, Glass, Glass-Ionomer, Glass-Transition, Gradient, Grinding, Growth, Gyration, H., HEMA, HFSS, Han, Havriliak-, Heterogeneities, Heterogeneity, Highly, Hydrogen, IPN, Index, Inducing, Induction, Informatics, Informatics, Infrared, Infrastructure, Initial-Stages, Inner, Integral, Inter, Interactions, Interdiffusion, Interface, Interlaboratory, Interphase, Iosipescu, Isotactic, JKR, JKR, K., Kinetics, Kinetics, Kohlrausch-Williams-Watts, Kratky-Porod, LCM, LCST, LPG, Langmuir-Blodgett, Laplace, Laponite, Laser, Lattice, Lattice-Boltzmann, Length, Lennard-Jones, Lesions, Li

Citation

Davis, R. , Bur, A. , McBrearty, M. , Lee, Y. , Gilman, J. and Start, P. (2004), Dielectric Spectroscopy During Extrusion Processing of Polymer Nanocomposites: a High Throughput Processing/Characterization Method to Measure Layered Silicate Content and Exfoliation, Plasma Processes and Polymers, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=852536 (Accessed May 30, 2024)

Issues

If you have any questions about this publication or are having problems accessing it, please contact reflib@nist.gov.

Created August 31, 2004, Updated October 12, 2021