Core-shell microgels synthesized in continuous flow: Deep insight into shell growth using temperature-dependent FTIR

Fandrich P, Annegarn M, Wiehemeier L, Ehring I, Kottke T, Hellweg T (2022)
Soft Matter.

Zeitschriftenaufsatz | E-Veröff. vor dem Druck | Englisch
 
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Abstract / Bemerkung
While core–shell microgels have been intensively studied in their fully synthesized state, the formation mechanism of the shell has not been completely understood. Such insight is decisive for a customization of microgel properties for applications. In this work, microgels based on a N-isopropylmethacrylamide (NiPMAM) core and a N-n-propylacrylamide (NnPAM) shell are synthesized in a continuous flow reactor. The shell growth is studied depending on the solution's time of residence inside the reactor. PCS experiments reveal a significant decrease of the volume phase transition temperatures of the core and the shell, with increasing residence time. At early stages, a decreased swelling capacity is found before a discrete NnPAM shell is formed. Temperature-dependent FTIR spectroscopy shows that the decreased swelling capacity originates from a pronounced interpenetrated network (IPN) between NnPAM and NiPMAM. AFM images resolve heterogeneously distributed shell material after 3 min, pointing to an aggregation of NnPAM domains before the distinct shell forms. The combination of diffusional properties, AFM images and vibrational information confirms a deeply interpenetrated network already at early stages of the precipitation polymerization, in which the shell material heavily influences the swelling properties.
Erscheinungsjahr
2022
Zeitschriftentitel
Soft Matter
ISSN
1744-683X
eISSN
1744-6848
Page URI
https://pub.uni-bielefeld.de/record/2964496

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Fandrich P, Annegarn M, Wiehemeier L, Ehring I, Kottke T, Hellweg T. Core-shell microgels synthesized in continuous flow: Deep insight into shell growth using temperature-dependent FTIR. Soft Matter. 2022.
Fandrich, P., Annegarn, M., Wiehemeier, L., Ehring, I., Kottke, T., & Hellweg, T. (2022). Core-shell microgels synthesized in continuous flow: Deep insight into shell growth using temperature-dependent FTIR. Soft Matter. https://doi.org/10.1039/D2SM00598K
Fandrich, P., Annegarn, M., Wiehemeier, L., Ehring, I., Kottke, T., and Hellweg, T. (2022). Core-shell microgels synthesized in continuous flow: Deep insight into shell growth using temperature-dependent FTIR. Soft Matter.
Fandrich, P., et al., 2022. Core-shell microgels synthesized in continuous flow: Deep insight into shell growth using temperature-dependent FTIR. Soft Matter.
P. Fandrich, et al., “Core-shell microgels synthesized in continuous flow: Deep insight into shell growth using temperature-dependent FTIR”, Soft Matter, 2022.
Fandrich, P., Annegarn, M., Wiehemeier, L., Ehring, I., Kottke, T., Hellweg, T.: Core-shell microgels synthesized in continuous flow: Deep insight into shell growth using temperature-dependent FTIR. Soft Matter. (2022).
Fandrich, Pascal, Annegarn, Marco, Wiehemeier, Lars, Ehring, Ina, Kottke, Tilman, and Hellweg, Thomas. “Core-shell microgels synthesized in continuous flow: Deep insight into shell growth using temperature-dependent FTIR”. Soft Matter (2022).
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PMID: 35843118
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