This paper describes an easy method for preparing functional polyolefin copolymers of ethylene and 10-undecen-1-ol with a soluble metallocene/methylaluminoxane catalyst. The GPC profiles of the samples showed a reduction in the molar mass and a marked broadening in the molar mass distributions of the polymers with the addition of the polar compound. The bimodal molar mass distribution curve obtained indicated the presence of two or more active sites in the catalyst. The same results were obtained in DSC analysis. Two transition temperatures can be taken as evidence of the presence of a macroscopic phase separation of the polymer and the nonuniformity of the catalyst. The melt flow indices of the polymers were dramatically increased with the addition of functionalities to the polyethylene backbone, providing marked improvement in the processability of the polymers.