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- Title
Hyper-Crosslinkers Lead to Temperature- and pH-Responsive Polymeric Nanogels with Unusual Volume Change.
- Authors
Zhou, Ning; Cao, Xiaoyan; Du, Xuewen; Wang, Huaimin; Wang, Ming; Liu, Shuang; Nguyen, Khang; Schmidt‐Rohr, Klaus; Xu, Qiaobing; Liang, Gaolin; Xu, Bing
- Abstract
Hydrogels consisting of carboxylic acid groups and N-isopropylacrylamide as pendants on their polymeric network usually exhibit volume expansion upon deprotonation or volume contraction when being heated. Demonstrated here is an anti-intuitive case of a hydrogel containing multiple carboxylic acid groups at each crosslinking point in the polymeric network, which shrinks upon increasing pH from 1 to 7 at 37 °C or expands upon heating from 25 to 37 °C at pH 1. The unexpected volume change originates from the high percentage of the crosslinker in the polymers, as detected by solid-state 13C NMR spectroscopy. In addition, the volume changes are thermally reversible. As the first example of the use of functional hyper-crosslinkers to control the pH and thermal responses of nanogels, this work illustrates a new way to design soft materials with unusual behaviors.
- Subjects
CROSSLINKING (Polymerization); CROSSLINKED polymers; NANOGELS; PROTON transfer reactions; THERMAL expansion; ACRYLAMIDE
- Publication
Angewandte Chemie, 2017, Vol 129, Issue 10, p2667
- ISSN
0044-8249
- Publication type
Article
- DOI
10.1002/ange.201611479