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Mechanics versus Thermodynamics: Swelling in Multiple‐Temperature‐Sensitive Core–Shell Microgels
Author(s) -
Berndt Ingo,
Popescu Crisan,
Wortmann FranzJosef,
Richtering Walter
Publication year - 2006
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/anie.200502893
Subject(s) - shell (structure) , swelling , core (optical fiber) , materials science , thermodynamics , transition temperature , thermal , glass transition , composite material , polymer , physics , condensed matter physics , superconductivity
The thermal transition of a thermoresponsive microgel of poly‐ N ‐isopropylacrylamide (PNIPAM; transition temperature=34 °C) is shifted to higher temperatures when it is embedded in a shell of temperature‐sensitive poly‐ N ‐isopropylmethacrylamide (PNIPMAM; transition temperature=44 °C). The magnitude of the shift depends on the shell/core mass ratio. A thick shell induces a third transition arising from strong mechanical forces exerted on the core.