4.7 Article

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

期刊

GELS
卷 7, 期 2, 页码 -

出版社

MDPI
DOI: 10.3390/gels7020069

关键词

polyelectrolyte gels; osmotic bulk modulus; elasticity; salt; neutralization

资金

  1. JSPS KAKENHI [JP19K15628]
  2. Eno Scientific Foundation

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The effects of neutralization and salt on the structure and mechanical properties of polyacrylic acid (PAA) gels under equivolume conditions were studied using small-angle X-ray scattering (SAXS) measurements and tensile tests. The results showed that neutralization decreased scattering intensity and Young's modulus, while the addition of salt increased scattering intensity with little effect on Young's modulus. The newly developed equivolume post-ion-tuning technique may provide a new standard scheme for studying polyelectrolyte gels.
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.

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