For the first time individual propagation rate coefficients, k(p), for the homopolymerization of vinylidene fluoride (VDF) have been determined in homogeneous phase reactions with supercritical carbon dioxide. Experiments combining pulsed laser initiation and polymer analysis by size-exclusion chromatography were carried out for temperatures up to 90 degrees C and pressures up to 1100 bar. Absolute polymer molar masses required for the determination of k(p) were calculated on the basis of experimentally derived Mark-Houwink constants. A general equation k(p)(VDF) = f(p,T) was derived by applying multiple regression analysis of k(p) data. All data may be expressed by ln[k(p)/(L.mol(-1).s(-1))] = 19.96 - 3633 K/T + 0.27 p/bar x T-1/K-1. Due to the fluorine atoms in the monomer the kinetic data is significantly different from the nonfluorinated structural analogue ethene. For example, at 60 degrees C and 1000 bar VDF k(p) is 19400 L.mol(-1).s(-1) while k(p) for ethene is by a factor of 200 lower.