Preparation of organogel beads for smart valve components: kinetic study of their chemoresponsiveness
Citation Link: https://doi.org/10.15480/882.17661
Publikationstyp
Journal Article
Date Issued
2026-07-20
Sprache
English
TORE-DOI
Journal
Volume
59
Issue
14
Start Page
8403
End Page
8419
Citation
Macromolecules 59 (14): 8403-8419 (2026)
Publisher DOI
Publisher
American Chemical Society (ACS)
Chemoresponsive P(NiPAAm- co -AA) beads (approximately 3 mm radius) were synthesized via UV-light-induced copolymerization of N -isopropylacrylamide (NiPAAm) and acrylic acid (AA) in aqueous droplets suspended in silicone oil. SEM analysis revealed a closed surface for beads with a 3-fold excess of AA; macroporous morphologies appeared for NiPAAm:AA ratios of 1:1 and 3:1. Swelling behavior was mapped across linear alcohols, acids, esters, and their mixtures, revealing a cononsolvency related to ethanol presence. Beads with a 1:1 monomer ratio exhibited the largest swelling difference between ethanol and ethyl acetate or with mixtures of ethyl acetate and ethanol. Their reversible swelling–shrinkage was fitted to two exponential functions. The time constant of the first fast part is on the order of minutes. The extent of shrinkage is negatively correlated with the logarithmic ethanol fraction in ethyl acetate. Beads in a casing were used to halt the flow of ethyl acetate after a switch to ethanol.
Subjects
Polymers
Ethanol
Hydrogels
Organic compounds
Beads
DDC Class
540: Chemistry
Funding(s)
Publication version
publishedVersion