Cellulose is the most abundant natural polymer on earth[1-3]. However is an infusible and insoluble polymer in common solvents, which difficult its manipulation[4, 5]. Consequently it is usual to convert cellulose into its derivatives, as cellulose acetate to make it more processable[4, 5]. Cellulose acetate (CA) can be employed as a matrix to develop environmental friendly materials with tailored properties. In this work multiwall carbon nanotubes (MWCNT) were incorporated into CA and processed by melt compounding using two different equipments: an intensive batch mixer Haake (HK) and a Rondol mini-extruder (ME). Aiming to enhance the interface of CA/MWCNT surface, it was necessary to modify the carbon nanotubes with a 1,3-dipolar cycloaddition reaction, reaching a modification of 14 wt.%. Samples prepared in the ME exhibited improved thermal stability, and better dispersion of agglomerates among non-functionalized MWCNT. Rheological analyses showed an increase of the storage modulus at low frequencies for the samples prepared in both equipments with 0.5wt% of MWCNTs, leading to the formation of interconnected structures. This phenomenon was confirmed for the same sample prepared in the ME with non-functionalized MWCNTs, which revealed an electrical resistivity of 2.51E+05Ω.m. Keywords: Cellulose acetate, Multiwall carbon nanotubes, melt compounding, electrical conductivity References 1. Amass W, Amass A, and Tighe B. Polymer International 1998;47:89-144. 2. Rhim JW and Ng PK. Crit Rev Food Sci Nutr 2007;47(4):411-433. 3. Bastioli C. Handbook of Biodegradable Polymers. U.K.: Rapra Technology Limited, 2005. 4. Schiffman JD and Schauer CL. Polymer Reviews 2008;48(2):317-352. 5. Li Y, Wu M, Liu R, and Huang Y. Solar Energy Materials and Solar Cells 2009;93(8):1321-1328.