NDLI: Structural investigation of thermo-responsive poly(2-isopropyl-2-oxazoline) hydrogel across the volume phase transition.

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Structural investigation of thermo-responsive poly(2-isopropyl-2-oxazoline) hydrogel across the volume phase transition.

Content Provider	Semantic Scholar
Author	Li, Tianjiao Tang, Hui Wu, Peiyi
Copyright Year	2015
Abstract	The deswelling and swelling behaviors of poly(2-isopropyl-2-oxazoline)-based hydrogel synthesized by a one-pot microwave-assisted solvent-free reaction were investigated. A distinct hydrophobic collapse of the hydrogel compared with the corresponding aqueous solution was observed by FT-IR spectroscopy combined with two-dimensional correlation spectroscopy (2DCOS) and perturbation-correlation moving-window (PCMW) analyses. The volume phase transition (VPT) temperature of 35 °C during heating and the transition temperature range of 41-30 °C during cooling were determined, indicating different dynamic transition mechanisms during heating and cooling. Water expulsion starting from the benzene ring-centered hydrophobic spots to the surroundings was revealed during deswelling. However, during swelling, although the rebuilding of cross-linking hydrogen bond bridges provided a channel-like microstructure to reswell the hydrogel gradually, a slow, unusual recovery of the amide hydrogen bonds to water molecules was observed.
File Format	PDF HTM / HTML
DOI	10.1039/c4sm02812k
PubMed reference number	25611904
Journal	Medline
Volume Number	11
Issue Number	10
Alternate Webpage(s)	http://www.meplab.fudan.edu.cn/d/file/infonet/assays/2016-11-03/0e78cfcb74b52ed2462a09cbc9cd5c64.pdf
Alternate Webpage(s)	http://www.rsc.org/suppdata/sm/c4/c4sm02812k/c4sm02812k1.pdf
Alternate Webpage(s)	https://doi.org/10.1039/c4sm02812k
Journal	Soft matter
Language	English
Access Restriction	Open
Content Type	Text
Resource Type	Article

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