Direct measurement of crosslinked surface layer in superabsorbent poly(acrylic acid)

Jisoo Ha; Minsu Kim; Wooseop Lee; Hoyeon Lee; Changsun Han; Won Gun Koh; Du Yeol Ryu

doi:10.1016/j.matlet.2018.05.079

Direct measurement of crosslinked surface layer in superabsorbent poly(acrylic acid)

Jisoo Ha, Minsu Kim, Wooseop Lee, Hoyeon Lee, Changsun Han, Won Gun Koh, Du Yeol Ryu

Department of Chemical and Biomolecular Engineering

Research output: Contribution to journal › Article

5 Citations (Scopus)

Abstract

We propose a simple and quantitative method to evaluate thickness of crosslinked surface layer (t_x) for superabsorbent poly(acrylic acid) (PAA) materials using a fluorescent dye of rhodamine B (RhB). The electrostatic attraction between the cationic amine group of dye and the anionic carboxylate group of PAA allows us to measure the fluorescent contrast since the surface-crosslinking causes a significant decrease in concentration of carboxylate group compared to that of inner region. Our method utilizing the distinct adsorption difference of RhB visualizes the crosslinked surface (or shell) layer and successfully demonstrates a direct characterization of t_x in a dry state of superabsorbent materials, regardless of irregular particle shape.

Original language	English
Pages (from-to)	33-36
Number of pages	4
Journal	Materials Letters
Volume	228
DOIs	https://doi.org/10.1016/j.matlet.2018.05.079
Publication status	Published - 2018 Oct 1

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All Science Journal Classification (ASJC) codes

Materials Science(all)
Condensed Matter Physics
Mechanics of Materials
Mechanical Engineering

Cite this

Ha, J., Kim, M., Lee, W., Lee, H., Han, C., Koh, W. G., & Ryu, D. Y. (2018). Direct measurement of crosslinked surface layer in superabsorbent poly(acrylic acid). Materials Letters, 228, 33-36. https://doi.org/10.1016/j.matlet.2018.05.079

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AU - Kim, Minsu

AU - Lee, Wooseop

AU - Lee, Hoyeon

AU - Han, Changsun

AU - Koh, Won Gun

AU - Ryu, Du Yeol

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AB - We propose a simple and quantitative method to evaluate thickness of crosslinked surface layer (tx) for superabsorbent poly(acrylic acid) (PAA) materials using a fluorescent dye of rhodamine B (RhB). The electrostatic attraction between the cationic amine group of dye and the anionic carboxylate group of PAA allows us to measure the fluorescent contrast since the surface-crosslinking causes a significant decrease in concentration of carboxylate group compared to that of inner region. Our method utilizing the distinct adsorption difference of RhB visualizes the crosslinked surface (or shell) layer and successfully demonstrates a direct characterization of tx in a dry state of superabsorbent materials, regardless of irregular particle shape.

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10.1016/j.matlet.2018.05.079