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- W1992277342 abstract "The compressive engineering stress (σE)–strain (εE) relationship up to rupture of several mannuronic and guluronic alginate gels was studied by varying the alginate effective concentration (ceff) from 0.8 to 1.7% w/w and was correlated by using the power model (σE=kεnE) with coefficients of determination (r2) greater than 0.95. Whereas the degree of concavity (n) was about constant (2.17 ± 0.07) for all the gels examined, the rigidity constant (k) was found to increase with alginate intrinsic viscosity [η], guluronic residues fraction (xG), and ceff, this constant being generally greater for the G-rich alginate gels at ceff=const. The rigidity constant, as well the rupture stress (σER) and deformation work (LER), allowed the new indicators [k/(ceff)1.4, σER/(ceff)1.4, and LER/(ceff)1.4] to be calculated and used to discriminate efficiently the gelling ability of M-rich alginates from that of G-rich ones. Stress relaxation testing yielded a constant relaxation time spectrum with dimensionless viscoelastic coefficients practically independent of ceff, the latter showing clearly that high-M alginate gels were more elastic than the high-G ones" @default.
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- W1992277342 date "1999-03-01" @default.
- W1992277342 modified "2023-10-12" @default.
- W1992277342 title "Mechanical properties of alginate gels: empirical characterisation" @default.
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- W1992277342 doi "https://doi.org/10.1016/s0260-8774(99)00022-9" @default.
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