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Article

Neutralization and Salt Effect on the Structure and Mechanical Properties of Polyacrylic Acid Gels under Equivolume Conditions

1
Institute for Solid State Physics, The University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8581, Japan
2
Comprehensive Research Organization for Science and Society, 162-1 Shirakata, Tokai, Ibaraki 319-1106, Japan
*
Authors to whom correspondence should be addressed.
Submission received: 12 May 2021 / Revised: 4 June 2021 / Accepted: 7 June 2021 / Published: 9 June 2021
(This article belongs to the Special Issue Polyelectrolyte Gels: Volume II)

Abstract

The effects of neutralization and salt on the structure and mechanical properties of polyacrylic acid (PAA) gels under equivolume conditions were investigated by small-angle X-ray scattering (SAXS) measurements and tensile tests. We attained the equivolume condition by immersing a piece of PAA gel sample in an ion reservoir containing linear PAA, NaOH, and NaCl at prescribed concentrations (post-ion-tuning). The volume fraction of the linear polymer was set to be the same as that of the gel so as to satisfy the iso-osmotic pressure at the reference state. Various types of reservoirs were prepared by adding NaOH and/or NaCl with different concentrations to the reference reservoir, followed by immersing a PAA gel piece. In the SAXS measurements, a scattering peak appeared, and the scattering intensity at q = 0 decreased by neutralization, while the addition of salt increased the scattering intensity. On the other hand, Young’s modulus measured with the tensile test decreased with neutralization; however, it scarcely changed with the addition of salt. The newly developed equivolume post-ion-tuning technique may serve as a new standard scheme to study polyelectrolyte gels.
Keywords: polyelectrolyte gels; osmotic bulk modulus; elasticity; salt; neutralization polyelectrolyte gels; osmotic bulk modulus; elasticity; salt; neutralization
Graphical Abstract

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MDPI and ACS Style

Tsuji, Y.; Shibayama, M.; Li, X. Neutralization and Salt Effect on the Structure and Mechanical Properties of Polyacrylic Acid Gels under Equivolume Conditions. Gels 2021, 7, 69. https://doi.org/10.3390/gels7020069

AMA Style

Tsuji Y, Shibayama M, Li X. Neutralization and Salt Effect on the Structure and Mechanical Properties of Polyacrylic Acid Gels under Equivolume Conditions. Gels. 2021; 7(2):69. https://doi.org/10.3390/gels7020069

Chicago/Turabian Style

Tsuji, Yui, Mitsuhiro Shibayama, and Xiang Li. 2021. "Neutralization and Salt Effect on the Structure and Mechanical Properties of Polyacrylic Acid Gels under Equivolume Conditions" Gels 7, no. 2: 69. https://doi.org/10.3390/gels7020069

APA Style

Tsuji, Y., Shibayama, M., & Li, X. (2021). Neutralization and Salt Effect on the Structure and Mechanical Properties of Polyacrylic Acid Gels under Equivolume Conditions. Gels, 7(2), 69. https://doi.org/10.3390/gels7020069

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