| Title: |
Core–shell microgels synthesized in continuous flow: deep insight into shell growth using temperature-dependent FTIR |
| Authors: |
Fandrich, Pascal; Annegarn, Marco; Wiehemeier, Lars; Ehring, Ina; Kottke, Tilman; Hellweg, Thomas |
| Publisher Information: |
Royal Society of Chemistry (RSC) |
| Publication Year: |
2022 |
| Collection: |
PUB - Publications at Bielefeld University |
| Description: |
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;18(29):5492-5501. ; 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. |
| Document Type: |
article in journal/newspaper |
| Language: |
English |
| ISSN: |
1744-683X; 1744-6848 |
| Relation: |
info:eu-repo/semantics/altIdentifier/issn/1744-683X; info:eu-repo/semantics/altIdentifier/issn/1744-6848; info:eu-repo/semantics/altIdentifier/wos/000826186600001; info:eu-repo/semantics/altIdentifier/pmid/35843118 |
| Availability: |
https://pub.uni-bielefeld.de/record/2967123 |
| Rights: |
info:eu-repo/semantics/closedAccess |
| Accession Number: |
edsbas.F828ECC8 |
| Database: |
BASE |