The dispersion state of in dividual MWCNT in the polymer matrix influences the mechanical, thermal, and electrical properties of\nthe resulting composite. One method of obtaining a good dispersion state of MWCNT in a polymer matrix is to functionalize the\nsurface of MWCNT using various treatments to enhance the surface energy and increase the dispersibility ofMWCNT. In this study,\nwett ability and surface energy of UV/O3 and acid-treated multi wall carbon nano tubes(MWCNTs) and its poly methyl me tha cry late\n(PMMA) polymer nano composites were measured using contact angle analysis in various solvent media. Contact angle analysis\nwas based on ethylene glycol-water-glycerol probe liquid set and data was further fitted into geometric mean (Fowkes), van Oss-\nChaudhury-Good (GvOC), and Chang-Qing-Chen (CQC) models to determine both non polar and acid base surface energy\ncomponents. Analysis was conducted on MWCNT thin films subjected to different levels of UV/O3 and acid treatments as well as\ntheir resulting MWCNT/PMMA nano composites. Contact angle analysis of thin films and nano composites revealed that the total\nsurface energy of all samples was well fitted with each other. In addition, CQC model was able to determine the surface nature and\npolarity of MWCNT and its nano composites. Results indicated that the wett ability changes in the thin film and its nano composites\nare due to the change in surface chemistry. Finally, electrical properties of nano composites were measured to investigate the effect\nof surface functionality (acid or basic) on the MWCNT surfaces.
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