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Polímeros

versão impressa ISSN 0104-1428versão On-line ISSN 1678-5169

Resumo

NAVARRO, Rômulo F.. Application of Non-Linear Rheological Model to Shear-Tickening Polymeric Systems. Polímeros [online]. 2002, vol.12, n.1, pp.41-47. ISSN 1678-5169.  https://doi.org/10.1590/S0104-14282002000100011.

Shear-thickening (dilatant) behavior is common in several polymeric systems, but not in pure polymers. There are many theories that can be used to describe shear-thickening and some mathematical models that fit experimental data of three of its six types: dilatant, newtonian-dilatant, newtonian-dilatant-pseudoplastic, viscoplastic-dilatant, pseudoplastic-dilatant and newtonian-pseudoplastic-newtonian-dilatant sequences. This work deals with the behavior of newtonian-dilatant-pseudoplastic sequence behavior and proposes a hybrid, non-linear and viscous model to fit the experimental data from systems that present such rheological behavior. The systems under investigation were: a) solution of a,w poly(t-butylstyrene) in a mineral oil (3g/dl) (sample 1) and b) suspension of styrene ¾ methyl acrylate copolymer (S-co-MA) particles (15% vol.) in a poly(acrylic acid) (PAA) (1% wt) and water solution (sample 2). The proposed model agrees with the experimental data analysed.

Palavras-chave : Non-linear rheological model; non-newtonian behavior; shear-thickening; polymeric systems.

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