Synthesis and characterization of semi-IPN hydrogels composed of sodium 2-acrylamido-2-methylpropanesulfonate and poly(ε-caprolactone) diol for controlled drug delivery

Amlika Rungrod, Apichaya Kapanya, Winita Punyodom, Robert Molloy, Anisa Mahomed, Runglawan Somsunan*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


Semi-interpenetrating polymer network (semi-IPN) hydrogel of sodium 2-acrylamido-2-methylpropane sulfonate (Na-AMPS) and poly(ε-caprolactone) (PCL) diol for drug delivery applications was synthesized via free radical UV-photopolymerization technique using 2-hydroxy-4′-(2-hydroxyethoxy)-2-methylpropiophenone as an initiator and poly(ethylene glycol) diacrylate (PEGDA) as a crosslinker. The hydrogels' chemical structure and internal morphology have been explored using Fourier-transform infrared spectroscopy and scanning electron microscopy. The influence of PCL diol and PEGDA concentrations on the synthesized semi-IPN hydrogel properties was investigated. The semi-IPN hydrogel can increase the elasticity of the hydrogel while simultaneously providing enough water uptake and water retention. Furthermore, the semi-IPN hydrogel was non-cytotoxic to mouse fibroblasts L929 cells. Finally, ciprofloxacin (CIP) was used as a model drug and was efficiently encapsulated into the semi-IPN hydrogels. Drug loading capacity was enhanced with increasing PCL diol and CIP content. It was also observed that the PCL diol and CIP contents had a marked influence on the release profiles. Thus, the rate of release could be designed by changing the Na-AMPS to PCL diol ratio and CIP content. Drug release was found to be both diffusion and swelling-controlled in accordance with the Fickian and non-Fickian transport mechanisms. In the light of the results obtained, their easy formability, their appropriate mechanical and physical properties make P(Na-AMPS)/PCL diol semi-IPN hydrogels are the potential candidates for use as drug carrier and controlled drug release materials in the biomedical field.

Original languageEnglish
Article number110978
JournalEuropean Polymer Journal
Early online date29 Dec 2021
Publication statusPublished - 5 Feb 2022

Bibliographical note

© 2021, Elsevier. Licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International

Funding Information:
This research project was supported by Fundamental Fund 2022, Chiang Mai University and has received partial funding from the European Union's Horizon 2020 research and innovation programme under the Marie Sklodowska-Curie grant agreement No 871650 (MEDIPOL). The authors would also like to thank Chiang Mai University and the Science Achievement Scholarship of Thailand (SAST). The raw/processed data required to reproduce these findings cannot be shared at this time as the data also forms part of an ongoing study.


  • Drug release
  • Poly(ε-caprolactone)
  • Semi-interpenetrating polymer network (semi-IPN) hydrogel
  • Sodium 2-acrylamido-2-methylpropane sulfonate


Dive into the research topics of 'Synthesis and characterization of semi-IPN hydrogels composed of sodium 2-acrylamido-2-methylpropanesulfonate and poly(ε-caprolactone) diol for controlled drug delivery'. Together they form a unique fingerprint.

Cite this