期刊
CURRENT OPINION IN COLLOID & INTERFACE SCIENCE
卷 19, 期 2, 页码 84-94出版社
ELSEVIER SCIENCE LONDON
DOI: 10.1016/j.cocis.2014.03.011
关键词
Microgels; Poly-N-isopropyl acryl amide; Cononsolvency; Methanol; Computer simulation
资金
- Deutsche Forschungsgemeinschaft [Sonderforschungsbereich SFB 985]
- Excellence Initiative by the German federal government
- Excellence Initiative by the German state government
Poly-N-isopropyl acryl amide (PNIPAM) is swollen in both pure water and pure methanol but collapses in mixtures of these solvents. In this review, this cononsolvency of PNIPAM in water/methanol mixtures is discussed. Experimental studies of linear PNIPAM chains and macrogels are compared to microgels. Theoretical studies are presented based on molecular dynamics simulation and quantum mechanical calculations as well as semi-empirical models. The different explanations for the cononsolvency available in the literature are introduced. Experiments show that all PNIPAM species collapse and re-swell at comparable methanol fraction in the mixture. Cross-linker density of macrogels and microgels has only slight influence on cononsolvency, whereas chain length of linear chains has a significant influence. Microgels provide advantages to study cononsolvency by en'abling a broader experimental approach. Furthermore, multi-sensitive microgels can be prepared, which contain compartments sensitive to different stimuli. (C) 2014 Elsevier Ltd. All rights reserved.
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