Abstract
Steady-state fluorescence (SSF) technique was employed for studying swelling and drying of poly(acrylamide-co-acrylic acid) (P(AAm-co-AAc)) composite gels for low and high pH. Disc shaped composite gels were prepared by free-radical crosslinking copolymerization of P(AAm-co-AAc). N, N'-methylenebis (acrylamide) (BIS) and ammonium persulfate (APS) were used as crosslinker and initiator, respectively. Pyranine 4 (4sPy) was introduced as a fluorescence probe. P(AAm-co-AAc) composite gels dried before using for swelling experiments. Fluorescence intensity of 4sPy was monitored during in situ swelling and drying processes of composite gels. It was observed that fluorescence intensity values decreased as swelling is proceeded. Li-Tanaka equation was used to determine the swelling time constants, τ and cooperative diffusion coefficients, D from intensity variations during the swelling processes. It was also observed that fluorescence intensity values increased as drying is proceeded. Gravimetrical and volumetrical experiments were also performed. It was shown that swelling time constants, τ decreased, diffusion coefficients for swelling process, DF increased and diffusion coefficients for drying process DG decreased as the pH values are increased.
Original language | English |
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Title of host publication | Proceedings of PPS 2016 |
Subtitle of host publication | The 32nd International Conference of the Polymer Processing Society - Conference Papers |
Editors | Abderrahim Maazouz |
Publisher | American Institute of Physics Inc. |
ISBN (Electronic) | 9780735416062 |
DOIs | |
Publication status | Published - 14 Dec 2017 |
Event | 32nd International Conference of the Polymer Processing Society, PPS 2016 - Lyon, France Duration: 25 Jul 2016 → 29 Jul 2016 |
Publication series
Name | AIP Conference Proceedings |
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Volume | 1914 |
ISSN (Print) | 0094-243X |
ISSN (Electronic) | 1551-7616 |
Conference
Conference | 32nd International Conference of the Polymer Processing Society, PPS 2016 |
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Country/Territory | France |
City | Lyon |
Period | 25/07/16 → 29/07/16 |
Bibliographical note
Publisher Copyright:© 2017 Author(s).
Keywords
- Hydrogels
- drying
- fluorescence
- swelling