R Taherian - Ph.D student
M.J .Hadianfard - Professor,
A Nozad Golikand - Header of Materials research institute, Tehran, Iran
M Moradzaman - Bachlor student in department of material engineering

This paper is focusing on evaluation of ball milling as a mixing method for manufacturing MWCNT/P composite and considering effect of milling time on properties of functionalized and pristine CNT/P composites, in two CNT concentrations. The ball milling times were 1, 2, 4 and 6 hours. The CNT loading were 1 and 5%wt. Also the effect of functionalizing with acid nitric refluxing has been considered. The material properties have been characterized by The DSC analysis (for thermal analysis), Raman (for surface analyzing of CNTs), bending test (for mechanical test), electrical conductivity, and also SEM & TEM (in order to microscopic analysis). The results of electrical conductivity and bending tests have been shown the best time for ball milling is about 2 hours. The results of analyzes have been indicated upper than 2 hours the surface bonds of CNTs have been considerably damaged and their lengths are decreased and lower than this time also reduces suitable dispersion. The results show functionalization decreases conductivity however increases mechanical strength that this is in agreement with other reports. DSC curve showed the composites and neat polymer have an exothermic reaction in about 220°C that is ascribed to completing of curing and condensation in hot compression

Ball milling, MWCNT, polymer, Composite, Functionalization