Abstract
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.
Original language | English |
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Pages (from-to) | 33-36 |
Number of pages | 4 |
Journal | Materials Letters |
Volume | 228 |
DOIs | |
Publication status | Published - 2018 Oct 1 |
Bibliographical note
Funding Information:This research was supported by LG Chem. Ltd, Korea. DYR acknowledges the NRF grants (2017R1A2A2A05001048, 2017R1A4A1014569) funded by the Ministry of Science, ICT & Future Planning (MSIP), Korea.
Funding Information:
This research was supported by LG Chem. Ltd, Korea. DYR acknowledges the NRF grants ( 2017R1A2A2A05001048 , 2017R1A4A1014569 ) funded by the Ministry of Science, ICT & Future Planning (MSIP), Korea .
All Science Journal Classification (ASJC) codes
- Materials Science(all)
- Condensed Matter Physics
- Mechanics of Materials
- Mechanical Engineering