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Issue 37, 2017
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Revealing the distinct thermal transition behavior between PEGA-based linear polymers and their disulfide cross-linked nanogels

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Abstract

The distinct thermal transition behavior of thermoresponsive block polymers based on poly(ethylene glycol)methyl ether acrylate (PEGA) and their corresponding disulfide-cross-linked nanogels was studied by using FTIR measurements in combination with two-dimensional correlation spectroscopy (2Dcos). Spectral analysis clearly reveals that the sharp thermal transition of the precursor polymer is accompanied by a forced hydration process induced by the formation of hydrogen bonds between the entrapped water molecules and the C[double bond, length as m-dash]O groups, while the nanogel with a relatively continuous thermal transition is related to the existence of various dehydrating states of the C[double bond, length as m-dash]O groups. The C–H groups in the pyridyl disulfide (PDS) units exhibit a distinct change in the thermoresponsive profile of the precursor and the nanogel to show the effect of the polymer architecture on the thermal transition behavior. Additionally, a portion of the poly(N,N-dimethylacrylamide) (PDMA) segments is entrapped in the nanogel core, indicating that the thiol–disulfide exchange reaction occurs rapidly within the nanogels.

Graphical abstract: Revealing the distinct thermal transition behavior between PEGA-based linear polymers and their disulfide cross-linked nanogels

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Publication details

The article was received on 27 Jul 2017, accepted on 31 Aug 2017 and first published on 31 Aug 2017


Article type: Paper
DOI: 10.1039/C7CP05084D
Citation: Phys. Chem. Chem. Phys., 2017,19, 25746-25753
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    Revealing the distinct thermal transition behavior between PEGA-based linear polymers and their disulfide cross-linked nanogels

    W. Sun, Z. An and P. Wu, Phys. Chem. Chem. Phys., 2017, 19, 25746
    DOI: 10.1039/C7CP05084D

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