An exponential chemorheological model for viscosity dependence on degree-of-cure of a polyfurfuryl alcohol resin during the post-gel curing stage

37th Risø International Symposium on Materials Science

Domínguez, J.C.^1 ; Oliet, M.^1 ; Alonso, M.V.^1 ; Rodriguez, F.^1 ; Madsen, B.^2

Department of Chemical Engineering, Complutense University of Madrid, Avda. Complutense s/n, Madrid

28040, Spain^1

Department of Wind Energy, Section of Composites and Materials Mechanics, Technical University of Denmark, Risø Campus, Frederiksborgvej 399, Roskilde

DK-4000, Denmark^2

关键词: Arrhenius models;    Chemorheological behavior;    Complex viscosity;    Curing temperature;    Exponential models;    Exponential type;    Isothermal tests;    Polyfurfuryl alcohols;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/139/1/012018/pdf
DOI  :  10.1088/1757-899X/139/1/012018

来源: IOP

【 摘 要 】

In the present study, the chemorheological behavior of a bio-based polyfurfuryl alcohol (PFA) resin has been determined by rheological isothermal tests at different curing temperatures for the post-gel curing stage of the resin, using three different amounts of catalyst (2, 4 and 6 wt %). Instead of modeling the evolution of the complex viscosity using a widely used chemorheological model such as the Arrhenius model for each tested temperature, the change of the complex viscosity as a function of the degree-of-cure was predicted using a new exponential type model. In this model, the logarithm of the normalized degree-of-cure is used to predict the behavior of the logarithm of the normalized complex viscosity. The model shows good quality of fitting with the experimental data for 4 and 6 wt % amounts of catalyst. For the 2 wt % amount of catalyst, scattered data leads to a slightly lower quality of fitting. Altogether, it is demonstrated that the new exponential model is a good alternative to conventional chemorheological models due to its simplicity and suitability.