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Issue 20, 2014
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LCST transition of PNIPAM-b-PVCL in water: cooperative aggregation of two distinct thermally responsive segments

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Abstract

The self-aggregation behavior of poly(N-isopropylacrylamide)-b-poly(N-vinylcaprolactam) (PNIPAM-b-PVCL) during the thermal-induced phase transition in water was explored by a combination of calorimetric, turbidity, dynamic light scattering (DLS) and FTIR measurements. Only one transition can be observed via all detecting methods, revealing the cooperative aggregation of the two distinct temperature-sensitive segments. What is more, the combination of strong hydrophobic interactions among the entire polymer chains and hydrogen bonds of C[double bond, length as m-dash]O…H–N within PNIPAM segments results in the sharp variations at the LCST and gradual variations above the LCST during the phase transition of PNIPAM-b-PVCL aqueous solution upon heating. Additional analysis by perturbation correlation moving window (PCMW) and two-dimensional correlation spectroscopy (2Dcos) indicates that the hydrophobic C–H groups have an earlier response than the relatively hydrophilic C[double bond, length as m-dash]O groups during the LCST transition.

Graphical abstract: LCST transition of PNIPAM-b-PVCL in water: cooperative aggregation of two distinct thermally responsive segments

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Article information


Submitted
06 feb. 2014
Accepted
20 feb. 2014
First published
20 feb. 2014

Soft Matter, 2014,10, 3578-3586
Article type
Paper

LCST transition of PNIPAM-b-PVCL in water: cooperative aggregation of two distinct thermally responsive segments

L. Hou and P. Wu, Soft Matter, 2014, 10, 3578
DOI: 10.1039/C4SM00282B

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