Wednesday, April 11, 2007

Feature Abstract in Nanotechnology Research and Development

ELECTRICAL, CHEMICAL AND THERMO-MECHANICAL PROPERTIES OF RECYCLED POLYCARBONATE/ORAGANO-MONTMORILLONITE NANOCOMPOSITES

Blessie A. Basilia1,2, Adrian Ian Y. Casano1 and Jeffrey W. Gan1

http://blessietabasiliaresume.blogspot.com/

http://adriancasanoresume.blogspot.com/

http://jeffreyganresume.blogspot.com/

1School of Earth and Materials Science & Engineering, MAPUA Institute of Technology
Muralla St., Intramuros, Manila, Philippines 1002

2 Industrial Technology Development Institute, Department of Science & Technology
Muralla St., Intramuros, Manila, Philippines 1002
(blessie_basilia@yahoo.com)

ABSTRACT

This study aims to investigate the electrical, chemical and thermo-mechanical properties of recycled polycarbonate/organo-montmorillonite nanocomposites at various clay loadings. Polycarbonate from post-consumer wastes was recovered by mechanical abrasion process and chemical stripping. Nanoclays, such as organo-montmorillonites (organoclays), are layered silicate clays that were modified with quaternary alkylammonium ions to make it hydrophobic and oleophilic. Formulations of 1, 3, 5 and 10% clay loading in the recycled polycarbonate (RPC) matrix were conducted. Imported organoclay (FLUKA) was used in comparison with the local organoclay (o-MMT). The two roll mill was used to mix and anneal the RPC with clay and the nanocomposites were formed into square plates using the compression molding machine. The developed RPC/o-mmt nanocomposite systems were characterized using the Thermo-Mechanical Analyzer (TMA), Dynamic-Mechanical Analyzer (DMA), Fourier Transform Infrared Spectrometer (FTIR), high potential tester, and insulation tester.

The changes in the absorption bands of the FTIR spectra of the nanocomposite systems confirmed the miscibility of the nanofiller in the RPC matrix. Electrical characterization of the local RPC/o-MMT systems showed an increase in electrical resistance with the increase in clay loading. The size of the particles, filler concentration, processing technique, and filler/matrix interactions were significant factors affecting the electrical resistance. The dielectric strength decreases with the increase in clay loading. This indicates that the RPC with dispersed clay in the polymer matrix had terminated the regular long chain of the polymer, and so became random and shorter. The glass transition temperature decreases with the increase in o-MMT loading. This behavior indicates that the o-MMT nanofiller may have acted as a plasticizer to the polycarbonate. Dimensional stability, thermal stability and modulus of elasticity were improved at higher clay loadings. The local o-MMT showed better compability with the RPC matrix than with FLUKA. The development of this type of nanocomposites will help lower formulation cost of engineering thermoplastics and enhance the functional properties of recycled polycarbonate for the growing plastics industry.

Keywords: nanocomposites, polycarbonate, organoclays

1 Comments:

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