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Calcium alginate microspheres coated by bio-based UV-cured resin with high water retention performance

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Abstract

In this work, a bio-based resin of acrylated epoxidized soybean oil (AESO) mixed with three types of active diluents (Isoborneol methacrylates [IBOMA], tripropylene glycol diacrylate [TPGDA], and Ethoxylated trimethylolpropane triacrylate [ETPTA]) is used to form a protective UV-curable coating film on calcium alginate water-carrying microspheres (CA-WCMs). Calcium alginate microspheres (CAMs) have previously been used to encapsulate only ester soluble or oil-in-water core materials, thus limiting their application. After UV-curing with an increased active diluent dose, the pencil hardness, pendulum hardness, and mechanical strength of the CAMs increased. A photopolymerization kinetics study reveals that the maximum double bond (C=C) conversion rates of AESO-IBOMA, AESO-TPGDA, and AESO-ETPTA are 95, 92, and 86%, respectively, and the maximum conversion rate of C=C bond is 87% in their mixed system. Additionally, the water retention rate of the water-carrying microspheres (WCMs) increased with an increasing number of coating layers, plateauing after the number of layers exceeded four. The water retention is favorable, with more than 75% of the water stored for a duration of 50 days. Overall, the cost-effective and environmentally friendly method has shown encouraging results in the acquisition of water-absorbing CAMs, with the potential to overcome existing implementation constraints.

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Acknowledgements

The authors gratefully acknowledge the Key Standard Laboratory of Cigarette Materials, China Tobacco Industrial Cooperation. Partial financial support was received from fundamental research fund from Material Research Institute, Research and Development Centre of China Tobacco Yunnan Industrial Co., Ltd.

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TY wrote the main manuscript and prepared figures 1, 2, and 6. XW is responsible for data curation and editing, and prepared figure 4. YH and CZ were responsible for partial analysis. LC was responsible for conceptualization and methodology. LK conducted statistical analysis and experimental design, as well as preparing tables 1 and 2 and figures 3, 5, 7-8. HZ and BY were responsible for materials preparation. JZ conceptualized and developed the methodology, while ZY conducted the validation. HW and YZ are responsible for the formal analysis. All authors reviewed the manuscript.

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Correspondence to Liang Cheng or Linghan Kong.

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Yu, T., Wang, X., Hu, Y. et al. Calcium alginate microspheres coated by bio-based UV-cured resin with high water retention performance. Polym. Bull. (2024). https://doi.org/10.1007/s00289-024-05421-8

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