Volume 20, Issue 2, 2011

LETTER: ELECTRIC AND MAGNETIC PROPERTIES OF RECYCLED
NDFEB-NATURAL RUBBER COMPOSITES

P Jantarattana1, C Sirisathitkul2*, A Hunyek2, S Maensiri3

1Department of Physics, Faculty of Science, Kasersart University, Thailand.
2Magnet Laboratory, School of Science, Walailak University, Nakon Si Thammarat, Thailand.
3School of Physics, Institute of Science, Suranaree University of Technology, Nakon Ratchasima, Thailand.

*Author to whom correspondence should be addressed: E-mail: schitnar@wu.ac.th

Received 4 December 2010; accepted 1 February 2011

ABSTRACT
Electromagnetic properties of natural rubber (NR) incorporated with recycled neodymium-iron-boron (NdFeB) powder from 0 to 120 phr by the two-roll mill technique were studied. The remanent magnetization, coercive field and logarithmic value of the electrical permittivity were linearly increased with the NdFeB loading according
to the rule of mixture suggesting that interactions between NdFeB clusters were moderate. The addition of 120 phr NdFeB also increased the reflection loss of NR.

Keywords: Neodymium iron boron; natural rubber; hysteresis loop; electrical permittivity; reflection loss.