Mathematical modeling of the chemical modification process of polyethylene by grafting of maleic anhydride. / Modelagem matemática do processo de modificação química de polietileno por enxerto de anidrido maleico.

AUTOR(ES)
DATA DE PUBLICAÇÃO

2009

RESUMO

The scope of this work is the development of a mathematical model that can represent the process of grafting of maleic anhydride in polyethylene. The objective of this model is to preview the main modifications in polymer structure, as degree of grafting and degree of gel. In this process, an initiator, generally a peroxide) is used to generate free radicals that can abstract hydrogen from the polymer molecules, producing polymeric radicals. Maleic anhydride can react with these polymeric radicals, resulting in grafted polymer chains, or with the initiator radicals. This mechanism includes termination reactions between the different types of radicals present. Gel content was calculated from the crosslinking degree using the approximation of Charlesby-Pinner. Kinetic constants of the model were estimated through non-linear regression, by fitting the model to experimental data taken from literature. The model obtained was further tested using other data sets obtained from literature. The developed model was able to represent adequately the experimental data under different conditions.

ASSUNTO(S)

simulação modelos matemáticos grafting polyethylene simulation maleic anhydride polímeros (materiais)

ACESSO AO ARTIGO

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