Thermoresponsive shape-memory polymer
aerogels have been produced
from thiol–ene networks of 1,6-hexanedithiol, pentaerythritol
tetrakis(3-mercaptopropionate), and triallyl-1,3,5-triazine-2,4,6-trione.
The thiol–ene networks form organogels with either acetonitrile
or acetone as the solvent, which can be subsequently removed using
supercritical CO2 extraction. The resulting aerogels have
nearly quantitative shape fixing and shape recovery with a glass transition
temperature ranging from 42 to 64 °C, which serves as the thermal
transition trigger for the shape-memory effect. The aerogels have
a porosity of 72% to 81% but surface areas of only 5–10 m2/g.
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