AC Electrical and Structural Properties of Polymethylmethacrylate/Aluminum Composites

Different concentrations (i.e., 10, 20, 30, and 40 wt%) of Al metal are dispersed in polymethylmethacrylate (PMMA) matrix and the composite films are prepared by solution casting method. The frequency and temperature dependence of dielectric constant, dielectric loss, and conductivity of pure polyme...

Full description

Saved in:
Bibliographic Details
Published in:Journal of composite materials 2010-12, Vol.44 (26), p.3165-3178
Main Authors: Singh, Dolly, Singh, N.L., Kulriya, P., Tripathi, A., Phase, D.M.
Format: Article
Language:English
Subjects:
Aluminum
Applied sciences
Composites
Dielectric constant
Dielectric loss
Electric power generation
Exact sciences and technology
Fillers
Forms of application and semi-finished materials
Fundamental areas of phenomenology (including applications)
Mathematical models
Physics
Polymer industry, paints, wood
Polymer matrix composites
Polymethyl methacrylates
Resistivity
Sheets and films
Solid mechanics
Structural and continuum mechanics
Technology of polymers
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Different concentrations (i.e., 10, 20, 30, and 40 wt%) of Al metal are dispersed in polymethylmethacrylate (PMMA) matrix and the composite films are prepared by solution casting method. The frequency and temperature dependence of dielectric constant, dielectric loss, and conductivity of pure polymer and polymer composites filled with Al-metal filler are studied in the broad frequency range from 100 Hz to 10 MHz and in the temperature range 25—80°C. It is observed that the dielectric constant, dielectric loss, and electrical conductivity gradually increase with filler concentration and also with temperature and is explained in terms of hopping conduction mechanism. The electrical conductivity of the composites obeys universal power law model (i.e., σ = Af n), where n is power exponent. A comparison of dielectric constant values of PMMA/Al composites is made with predictions of theoretical models and it is observed that an empirical power equation gives a better fit to our results. Structural property of the composites is studied by means of X-ray diffraction. The results show that the crystallinity and crystalline size increase with increasing concentration of aluminum filler. Average surface roughness is observed to change with filler concentration as obtained from atomic force microscopy and scanning electron microscopy analysis.
ISSN:0021-9983
1530-793X
DOI:10.1177/0021998310371534