A series of gamma-(2,3-dihydroxypropoxy)propyl-terminated poly(dimethylsiloxane) (DHT-PDMS) samples with different molecular weights were prepared through the acid-catalyzed equilibrium copolymerization of octamethylcyclotetrasiloxane and 1,3-bis[gamma-(2,3-dihydroxypropoxy)-propyl]tetramethyldisiloxane. The intrinsic viscosity in toluene ([eta](toluene)) and the number-average molecular weight (M-n) were determined with an Ubbelohde viscometer and H-1-NMR spectra, respectively. In this way, the relationship between [eta](toluene) and M-n was established. For 2.0 x 10(4) < M-n < 4.0 x 10(4), [eta](toluene,25degreesC) was 1.874M(n) (0.323). The solution behavior of DHT-PDMS was also investigated. (C) 2004 Wiley Periodicals, Inc.