Remarkable distinctions in the heat-induced phase transition processes of two poly(2-isopropyl-2-oxazoline)-based mixed aqueous solutions

Soft Matter
Tianjiao LiPeiyi Wu

Abstract

Detailed phase transition processes of poly(2-isopropyl-2-oxazoline) (PIPOZ)/poly(N-isopropylacrylamide) (PNIPAM) and PIPOZ/poly(N-vinylcaprolactam) (PVCL) mixtures in aqueous solution were investigated by DSC, temperature-variable (1)H-NMR, optical microscopy and FT-IR spectroscopy measurements accompanied with two-dimensional correlation spectroscopy (2Dcos) and perturbation correlation moving window (PCMW) analytical methods. Through the comparison of these two systems, it is revealed that PVCL chains can interact with PIPOZ chains directly through the polymer-water-polymer cross-linking hydrogen bonds (C[double bond, length as m-dash]OD-O-DO[double bond, length as m-dash]C), which induce their transition process as one. However, in the PIPOZ/PNIPAM mixture, the phase transition of the given component (PNIPAM or PIPOZ) is indirectly affected by the presence of the second component, because the strong hydrogen bonds C[double bond, length as m-dash]OD-N in PNIPAM components forbid the direct connection with PIPOZ, which induces two phase transition processes separately with no liquid-liquid phase separation (LLPS). Additionally, the formation of polymer-water-polymer hydrogen bonds (C[double bond, length as m-dash]OD-O-DO[doub...Continue Reading

References

Jan 1, 1997·Journal of Biomaterials Science. Polymer Edition·V ChytrýK Ulbrich
Apr 15, 2006·Applied Spectroscopy·Shigeaki MoritaYukihiro Ozaki
Oct 2, 2007·Angewandte Chemie·A Levent DemirelHelmut Schlaad
Sep 22, 2009·Angewandte Chemie·Richard Hoogenboom
Sep 9, 2011·The Journal of Physical Chemistry. B·Shengtong Sun, Peiyi Wu
Mar 2, 2013·Chemical Society Reviews·Debashish RoyBrent S Sumerlin

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Citations

Nov 19, 2015·Physical Chemistry Chemical Physics : PCCP·Shengtong Sun, Peiyi Wu
Nov 5, 2015·Physical Chemistry Chemical Physics : PCCP·Shengtong Sun, Peiyi Wu
Jun 15, 2016·Langmuir : the ACS Journal of Surfaces and Colloids·Zhangxin YePeiyi Wu
Jun 30, 2019·Journal of Colloid and Interface Science·Payal NarangPannuru Venkatesu

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