Abstract: MATH/CHEM/COMP 2002, Dubrovnik, June 24-29, 2002

Pearson-type I Distribution Function

for Polydisperse Polymer Systems.

Molecular Mass Distribution

Grozdana BogdaniC¹ and Lajos Jakab²

¹INA - Industrija nafte, d.d., Strategic Development, Research and Investment Sector, Lovinciceva b.b., 10002 Zagreb, POB 555, Croatia

²Formerly KFKI, Atomic Energy Research Institute, H 1525 Budapest, Hungary

An attractive feature of the distribution function, which uses relatively simple expression for approximating probability density, is presented. The Pearson-type I distribution function is used to represent the molecular mass distribution (MMD) function for polymers for which the number average, , weight average, , z-average, , and z+1 average, , values are available. Consequently, estimations of the different molecular mass average values (i.e. , ,  and , respectively), are performed from experimentally determined MMD, proposing the Pearson-type I function as a model MMD function, fitting the model parameters and using nonlinear regression.