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Química Nova

Print version ISSN 0100-4042On-line version ISSN 1678-7064

Abstract

CAMPESE, Gilsinei Marques et al. Mechanicals resistance of thermosensitive hydrogels consisting of alginate-Ca2+ / PNIPAAm, type Semi-IPN. Quím. Nova [online]. 2007, vol.30, n.7, pp.1649-1652. ISSN 0100-4042.  http://dx.doi.org/10.1590/S0100-40422007000700028.

Thermosensitive hydrogels were synthesized using alginate-Ca2+ in association with a thermosensitive polymer, such as PNIPAAm. The mechanical properties of the hydrogels were determined measuring the maximum tension of deformation. With the increase of the temperature by 25 to 40 ºC above the LCST the chains of PNIPAAm collapsed, dragging the alginate net and diminishing the size of the pores. The decrease in the size of the pores of the hydrogel was followed by an increase in the mechanicals resistance of the material.

Keywords : hydrogels; alginates; PNIPAAm.

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