Preparation of Telechelic Polyester Oligodiols by Chain-Transfer Polymerization of Epsilon-Caprolactone

α,ω-Dihydroxypoly(e-caprolactone)s were prepared by polymerization of e-caprolactone (eCL)initieted with Al[(OCH(CH 3 ) 2 ] 3 (I) and conducted in the presence of HO(CH 2 ) 5 OH (PD) as a transfer agent. Resulting HO-poly(eCL)-OH had M n = 400-1500, M w /M n = 1.25-1.06, and functionalities f= 1.99-1.93, respectively. GPC traces indicated the complete consumption of the transfer agent. The molecular weight were controlled, at the sufficiently low concentration of the initiator ([I] 0 j10 -3 mol.L -1 vs [PD] 0 >10 -1 mol.L -1 ), by the [eCL] 0 /[PD] 0 ratio