Modelling and parameter estimation of trans‐β‐farnesene coordination polymerization

Abstract

Abstracttrans‐β‐Farnesene is a bio‐derived terpene monomer that can polymerize, generating polymers with properties that can be similar to the properties of conventional petroleum‐derived polymers. For this reason, in the present study, several coordination polymerizations of trans‐β‐farnesene are carried out using the Ziegler–Natta catalyst system composed by neodymium versatate (), diisobutylaluminum hidride (DIBAH), and dimethyldichlorosilane (DMDCS) in order to evaluate the influence of key operation variables on the control of average molar masses and monomer conversion. A phenomenological model is proposed to describe the coordination polymerization of trans‐β‐farnesene, and the kinetic parameters required to simulate the reactions are estimated. The initial concentration of DIBAH used as a chain transfer agent (CTA) is calculated by a data reconciliation procedure since this very active compound can participate in undesired side reactions. It is shown that the initial monomer, DIBAH, and concentrations exert strong influences on the monomer conversion and average molar masses of (poly)farnese while the temperature effect is not so pronounced. The proposed kinetic mechanism was able to predict well the experimental data collected during the reactions, with the successful reconciliation of CTA concentrations and estimation of model parameters.