Nano carbon／poly(methyl methacrylate)sols were prepared by a method of pulsed laser ablation at the interface of target submerged in flowing liquid(PLA—IT／SFL)

and the corresponding composite films were prepared by solution-casting．Spectrum studies indicated that there existed interaction between nano carbon particles and the PMMA matrix．which was consistent with the decrease in glass transition temperature of the composites with carbon content．TEM images revealed that a carbon encapsulated core／shell structure was formed in the composites

which could ensure good dispersion of carbon nanopartieles within PMMA matrix．The heat decomposition of the composites was less infiuenced by the introduction of nano carbon．