Dielectric properties of sawdust reinforced epoxy composites post-cured in microwaves

• Published in: Journal of reinforced plastics and composites 2013-05, Vol.32 (10), p.765-774
• Main Authors: Ku, H, Trada, M, Tai, P
• Format: Article
• Language: English
• Subjects: Dielectric constant; Dielectric properties; Glass transition temperature; Microwaves; Ovens; Polymer matrix composites; Sawdust; Storage modulus
• ISSN: 0731-6844; 1530-7964
• DOI: 10.1177/0731684412475250

This study focuses on the measurement and evaluation of dielectric properties of composite materials with a view to benefiting these relevant industries. Previously published have been the mechanical and thermal properties of sawdust reinforced epoxy composites. The properties of a dielectric material can be controlled through the introduction of various fillers. This study was primarily undertaken to determine the effect of sawdust on the dielectric properties of the composites. The original contribution of this paper states that samples post-cured in microwaves have higher dielectric constant values but lower loss tangent values than their counterparts post-cured in an oven. For all percentages by weight of sawdust, the glass transition temperature for the microwave-cured samples was lower and the composite was softer; the opposite was true for the oven-cured sample. In addition, the storage modulus of all samples post-cured in microwaves is also lower than their counterparts. This is in line with the fact that it is a softer material and has lower storage modulus and lower glass transition temperature.