Mechanical Characteristics of PVA/STMP Hydrogel in Tensile and Unconfined Compression

Wei Zhu; Jin Gao; Xiao Gang Li; Jun Li Lin; Han Hui Cao; Bai Tian Sun

doi:10.4028/www.scientific.net/AMM.157-158.1372

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HomeApplied Mechanics and MaterialsApplied Mechanics and Materials Vols. 157-158Mechanical Characteristics of PVA/STMP Hydrogel in...

Mechanical Characteristics of PVA/STMP Hydrogel in Tensile and Unconfined Compression

Abstract:

Hydrogels based on Poly(vinyl alcohol) (PVA) were synthesized using the combining method of chemical agent and freezing-thawing cycle. Sodium Trimetaphosphate (STMP) is a kind of crosslinking agent in this reaction. The resulting hydrogels were characterized in terms of tensile properties and compression stress-strain testing. The influences of STMP and water content on mechanical properties of hydrogels were investigated. It is suggested that PVA hydrogel has excellent tensile strength, higher elongation at break and viscoelastic materials’ stress-strain curve. Tensile strength of specimens without STMP increases from 4 to 6.8 MPa, as well as elongation increase from 300% to 458%, respectively. When the strain changes from 10% to 50%, tangent compressive modulus dramatically increases from 0.58 to 9.9 MPa for hydrogels with 80wt % water and 0.41 to 5.4 MPa for 85wt % water. Meanwhile, the addition of STMP can further improve the mechanical properties of PVA hydrogel.

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Periodical:

Applied Mechanics and Materials (Volumes 157-158)

Pages:

1372-1375

DOI:

https://doi.org/10.4028/www.scientific.net/AMM.157-158.1372

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Online since:

February 2012

Authors:

Wei Zhu, Jin Gao, Xiao Gang Li, Jun Li Lin, Han Hui Cao, Bai Tian Sun

Keywords:

Elongation at Break, PVA Hydrogel, STMP, Tangent Compressive Modulus, Tensile Strength

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