N-[(tert-Butylperoxy)methyl]acrylamide (tBPMAAm), a new peroxide monomer containing a primary-tertiary peroxide group, was synthesized and employed for radical copolymerization with octyl methacrylate (OMA) to yield a novel functional polyperoxide (FPP). Copolymerization kinetics were analyzed to find tBPMAAm and OMA monomer reactivity ratios (r 1 , r 2 ) and Qe values. Kinetic characteristics provide a way to control FPP composition and its reactivity in radical processes. It is expected that the developed functional polyperoxide containing long alkyl fragments provides an affinity to polymeric surface. At the same time, since the peroxide groups readily decompose at elevated temperatures, the FPP can be used as a macroinitiator of radical polymerization. As a result, we expect that in the future the FPP will be applied as an efficient modifier of the polymeric surface.