Modelagem e simulação da etapa de estabilização termo-oxidativa de fibras de poliacrilonitrila (PAN) percursoras na fabricação de fibras de carbono

AUTOR(ES)
DATA DE PUBLICAÇÃO

1999

RESUMO

Studies related to the rnanufacture of carbon fibers indicate that the thermo-oxidative stabilization of precursor fibers is the slowest step, due to the complex reactions and changes in the physical structure of fibers. In order to know the stabilization step and eliminate expenses in experimental tests, modeling and simulation have been efficiently used to optimize this step. This work reports a mathematical modeling for the process of stabilization. The undle of polyacrylonitrile fibers (PAN) is modeled as a homogeneous solid, with the following chemical reactions: cyclization of the nitrile groups, dehydrogenation of carbon-carbon bonds and oxidation. The equations that describe the model are based on the chemical reactions rates, reacting species mass balances, radial mass and heat transfer rate within the bundle. The resulting system of equations was solved by the Orthogonal Collocation Method, and the Semi-implicit Runge-Kutta Method. The obtained results of concentrations and temperatures presented a coherent behavior with the literature experimental results. Finally, the model has been utilized to find which parameters influence the stabilization, and determine obtaining the best operation conditions.

ASSUNTO(S)

modelos matematicos simulação (computadores) fibras acrilicas

ACESSO AO ARTIGO

Documentos Relacionados