The polymerizations of 2-methylpropene (MP) via "all monomer in" (AMI) and "incremental monomer addition" (IMA) techniques initiated by the system 1,4-bis(1-azido-1-methylethyl)benzene (DAMEB)/AlEt(2)Cl/CH2Cl2 behave like a functionalizing "living" system in the range of (M) over bar(n) < 50 000 without the assistance of an electron donor. This is demonstrated by the azide F-N3, and aromatic ring F-Phi functionalities close to the theoretical values of 2 and of 1, respectively, for a specific functionalization; by the linearity of the (M) over bar(n) versus weight of polymers (W-p) plot without intercept, and by the constant chain number N close to the theoretical N-0. It is also shown that a poly(2-methylpropene) alpha,omega-diazide (PMP) used in combination with AlEt(2)Cl is able to reinitiate the polymerization of MP. The final polymer presents the same functionalities F-N3 and F-Phi as the starting polymer used as initiator, and the increase of (M) over bar n corresponds to the amount of MP introduced. The monomodal SEC chromatograms of the starting and of the final PMP show that the whole azide chain ends are efficient in this experiment of reinitiation of polymerization from the functionalized PMP. The Mayo 1/<(DP)over bar> versus 1/<(DP)over bar>(0) plot gives a straight line, the intercept of which corresponds to the ratio k(trM)/k(p) 2 X 10(-5), indicating that a possible transfer reaction to monomer could proceed at a very low rate, only detectable in the range of high (M) over bar(n) > 50 000.