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- Title
Improving the mechanical performance of P(N‐hydroxymethyl acrylamide/acrylic acid/2‐acrylamido‐2‐methylpropanesulfonic acid) hydrogel via hydrophobic modified nanosilica.
- Authors
Xu, Pan; Zong, Yi; Shang, Zhijie; Yao, Meiling; Liu, Pingde; Li, Xinxue
- Abstract
Hydrogels with high mechanical strength are essential for its most industrial applications. In this work, the hydrophobic SiO2 nanoparticles (M‐SiO2 NPs) modified with octadecyltrimethoxysilane were used as physical crosslinker to toughen the mechanical properties of hydrogels. The solution of monomers containing M‐SiO2 NPs, N‐hydroxymethyl acrylamide (NHAM), acrylic acid (AA), 2‐acrylamido‐2‐methylpropanesulfonic acid (AMPS), was polymerized to prepare a P(NHAM/AA/AMPS)‐based composite hydrogel without any chemical cross‐linker. The composition and microstructure of the hydrogel were carefully studied with Fourier transform infrared spectroscopy and scanning electron microscopy. The mechanical properties of the hydrogel were investigated through compressive and tensile tests. Dynamic swelling tests were carried out at different pH values (1.0–12.0) and salinity (2000–20,000 mg/L) to study the acid resistance, alkali resistance, and salt resistance of the hydrogel. The obtained results showed that the hydrogel exhibited excellent mechanical performance, which was attributed to the unique 3D network formed by the hydrogen bond between M‐SiO2 NPs and polymer as well as the hydrophobic association effect between the hydrophobic chains of M‐SiO2 NPs. Furthermore, the hydrophobic association effect was enhanced when contacting with salt, acid, and alkali solutions, thus endowing the hydrogel with intensified salt resistance and wider acid–base adaptability range.
- Subjects
ACRYLAMIDE; HYDROGELS; ACRYLIC acid; FOURIER transform infrared spectroscopy; POLYMER networks; HYDROPHOBIC interactions
- Publication
Journal of Applied Polymer Science, 2022, Vol 139, Issue 16, p1
- ISSN
0021-8995
- Publication type
Article
- DOI
10.1002/app.51987