ELECTROMAGNETIC INTERFERENCE SHIELDING EFFICIENCY OF CARBON NANOTUBE/ POLYMER COMPOSITE

Authors:

Bautista, Monico Anton P.

Feria, Denice N.

Mendoza, Sean Gilbert

Paras, Marion John

Adviser:

Dr. Fortunato Sevilla III

INTRODUCTION

EMI (definition, effects, significance) A problem of rapid growth in the electronic era. Mainly associated with the effect of current

induced by the electric and magnetic fields produced by the electrical circuit.

Affects the body health and one of the cause of machine malfunction.

A waste of time, source and money. Convenient Solutions

Metals Conductive polymer composites

- through EMI shielding material, interference will be solved.

CONDUCTIVE POLYMER COMPOSITES

Carbon Nanotubes CNTs are thin rolled sheets that is suitable for

EMI shielding. Highly conductive, high mechanical strength in

terms of density, permittivity, dielectric constant and aspect ratio, long life.

Respond to variations of reflection, absorption and multiple reflections.

Percolation property. To improve, need a COATING.

- The study is limited in using a certain polymer and to study the factors to be considered for producing EMI shielding material.

OBJECTIVES

Develop the EMI shielding efficiency of a carbon nanotube (CNT)/ polymer composite. It is to study an EMI shielding material and prepare

the CNT/ polymer composite that prevent the radiation and interference of devices in the industry.

It is to study the efficiency of the polymer composite when act as EMI prevention.

It is to study the shielding mechanisms for EMI together with the polymer to be hybridized with CNTs, and

It is to relate the shielding efficiency with respect to the resistance of the material.

REVIEW OF RELATED LITERATURE

Electromagnetic Interference (EMI) and EMI Shielding Efficiency Effects on commercial, military, and scientific

electronic devices (Eswaraiah, 2010). Pollution to electronic era (Saini, 2009). Conducting plastics and nanomaterials as a

convenient solution to EMI problems (Ping Li, 2010,2012).

Mechanisms to consider for EMI shielding (Saleh, 2009).

Carbon Nanotube (CNT) Highly conductive and flexible for mixing to improve

performance.

Polymer Composites Polyvinyl chloride (PVC) Silicone Sealant Polyaniline (PANI) Polycyanoacrylate (PCA)

In finding the Surface morphology SEM (Scanning Electron Microscope) AFM (Atomic Force Microscopy)

Smooth distribution of particles in the composite

IMAGES

CNT (SWCNT and MWCNT)

Polycyanoacrylate

PVC

Silicone Sealant

Polyaniline

Conducting Polymer with Coatings References

Carbon nanotubes in a polypropylene

matrix

Thomassin, J., Huynen, I., Jerome R.,

Detrembleur C. (2010).

Multi-walled carbon nanotube/

poly(trimethylene terephthalate)

Gupta, A., Choudhary, V.(2011).

Polyvinyl chloride reinforced graphite/

copper nanoparticles

] Al-Ghamdi, A., El-Tantawy, F. (2010).

Carbon nanotubes in polycarbonate

composites

Arjmand, M., Mahmoodi, M., Gelves, G.,

Park, S., Sundararaj, U. (2011).

Carbon nanotube/ poly methyl

methacrylate (PMMA) composites

Yuan-Li, H., Siu-Meng, Y., Chen-Chi,M.,

Chia-Yi, C. et. al.(2009)

Carbon nanotubes/ cement composites Singh, A., Gupta, B., Mishra, M. Chandra,

G., et. Al. (2013).

Carbon nanotube/ polyurethane

composites

Liu, Z., Bai, G., Yi, H., Ma, Y., et.al. (2007).

Carbon nanotube/ polystyrene composites Arjmand, M., Apperley, T., Okoniewski,

M.,Sundaraj, U. (2012).

Carbon nanotube filled with polyacrylate

composite films

Yong, L., Chen, C., Zhang, S., Yuwei, N.,

Huang, J. (2008).

 

METHODOLOGY Materials

Carbon NanotubesFor the PVC, Polycyanoacrylate, Silicon Sealant:

- Tetrahydrofuran (THF)- PVC, Polycyanoacrylate, Silicon Sealant

For the Polyaniline- Polyaniline- Aqueous solution like Potassium persulfate/

HCl Instruments

Van der Pauw measurement setup Microwave Optics System Faraday Cage

PANI SYNTHESIS (PREPARATION OF COMPOSITES)

Aniline

CNTPotassium

persulfate/ HCl

Polyaniline (PANI) with CNT

Mixed with solvent Add polymer

Polymer with PANI, CNT, THF

composite

Evaporate solvent

Ratios of the composite and CNT will be measured for accurate EMI SE

PREPARATION OF COMPOSITES

PVC/ Polycyanoacrylate/

Silicon Sealant

Tetrahydrofuran (THF)

Mixed polymer and THF

CNT

CNT with composite

composite

Evaporate THF

Ratios of the composite and CNT will be measured for accurate EMI SE

PREPARATION OF COMPOSITES

Polycyanoacrylate/ Silicon Sealant

Solvent

Mixed polymer and solvent

CNT

CNT with composite

composite

Evaporate solvent

Ratios of the composite and CNT will be measured for accurate EMI SE

ELECTRICAL RESISTIVITY

composite Van der Pauw measurement

setup

EMI SE TEST (ENCLOSED IN A FARADAY’S CAGE)AFTER, CALCULATIONS WILL BE MADE

Test Sample

Microwave generator

Microwave receiver

REFERENCES [1] Saini, P., Choudhary V. Singh, B.P. ,et.al. (2009). Polyaniline- MWCNT

nanocomposites for microwave absorption and EMI shielding.National Physics Laboratory. New Delhi, India.

[2] Thomassin, J., Huynen, I., Jerome R., Detrembleur C. (2010). Functionalized polypropylenes as efficient dispersing agents for carbon nanotubes in polypropylene matrix; application to electromagnetic interference (EMI) absorber materials. Belgium.

[3] Gupta, A., Choudhary, V.(2011). Electromagnetic interference shielding behavior of poly(trimethylene terephthalate)/ multiwalled carbon nanotube composites. New Delhi, India.

[4] Al- Saleh, M., Sundararaj, U. (2009).Electromagnetic interference shielding mechanisms of CNT/ polymer composites. University of Alberta, Canada.

[5] Liu, Z., Bai, G., Yi, H., Ma, Y., et.al. (2007). Reflection and absorption contributions to the electromagnetic interference shielding of single-walled carbon nanotube/polyurethane composites.National University, Tianjin, China.

[6] Singh, A., Gupta, B., Mishra, M. Chandra, G., et. Al. (2013).Multiwalled carbon nanotube/ cement composites with exceptional electromagnetic interference shielding properties. New Delhi, India.

REFERENCES [7] Arjmand, M., Apperley, T., Okoniewski, M.,Sundaraj, U. (2012). Comparative

study of electromagnetic interference shielding properties of injection molded versus compression molded multi-walled carbon nanotube/ polystyrene composites. University of Calgary, Canada.

[8] Wern- Shiarng, J., Huy-Zu, C., Chih- Feng, H. (2007).The electromagnetic shielding effectiveness of carbon nanotubes polymer composites. Taiwan.

[9] Yuan-Li, H., Siu-Meng, Y., Chen-Chi,M., Chia-Yi, C. et. al.(2009). Morphological, electrical, electromagnetic interference (EMI) shielding, and tribological properties of functionalized multi-walled carbon nanotube/ poly methyl methacrylate (PMMA) composites. Taiwan.

[10] Arjmand, M., Mahmoodi, M., Gelves, G., Park, S., Sundararaj, U. (2011). Electrical and electromagnetic interference shielding properties of flow-induced oriented carbon nanotubes in polycarbonate. University of Calgary, Canada.

[11] Bingqing, Y., Liming, Y., Leimei, S., Kang, A., Xinluo, Z. (2012). Comparison of electromagnetic interference shielding properties between single-wall carbon nanotube and grapheme sheet/ polyaniline composites. China.

[12] Al-Ghamdi, A., El-Tantawy, F. (2010). New electromagnetic wave shielding effectiveness at microwave frequency of polyvinyl chloride reinforced graphite/ copper nanoparticles.

[13] Thomassin, J. et.al.(2007) Multiwalled carbon nanotube of poly( E-caprolactone) nancomposites with exceptional EMI shielding properties.