The solution properties of cis-polyisoprene (PIP) polymerized by lanthanide complex catalyst were studied with viscosity

osmotic pressure

light scattering and GPC methods. The re suits indicated that the molecular chain of PIP is linear. The constants of the Mark-Houwink equation of PIP

Kw and α

have been determined in toluene

chloroform

tetrahydrofuran and hexane

respectively. The experimental GPC curves of PIP fractions were consistent with the theoretical curves from the logarithmic-normal distribution function. The monodispersed [n]-M equations were established from te polydispersed correction factors

qw. The mean-square end-to-end distances obtained from lightscattering are consistent with the calculated values of Flory's method. The unperturbed mean-square end-to-end distances obtained from Stock ma-yer and Fixman's method are basically consistent with the published data.