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International Journal of Polymer Science
Volume 2019, Article ID 3765614, 7 pages
https://doi.org/10.1155/2019/3765614
Research Article

Temperature Driven Transformation in Dextran-Graft-PNIPAM/Embedded Silver Nanoparticle Hybrid System

1Faculty of Chemistry, Taras Shevchenko National University of Kyiv, 01601 64/13 Volodymyrska St., Kyiv, Ukraine
2Faculty of Physics, Taras Shevchenko National University of Kyiv, 01601 64/13 Volodymyrska St., Kyiv, Ukraine
3Problem Research Laboratory, National University of Food Technology, Volodymyrska Str. 68, 01601 Kyiv, Ukraine

Correspondence should be addressed to A. Naumenko; au.veik.vinu@oknemuan_a

Received 7 February 2019; Revised 17 April 2019; Accepted 21 May 2019; Published 12 June 2019

Guest Editor: Marco Caniato

Copyright © 2019 V. Chumachenko et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

During the last decade, stimuli-responsible polymers based on poly(N-isopropylacrylamide) having conformational transition in the range of physiological temperature have been discussed as novel drug delivery nanosystems. A star-like copolymer with a dextran core and grafted poly(N-isopropylacrylamide) arms (D-g-PNIPAM) was synthesized, characterized, and used as a matrix for silver sol preparation. The comparative study of the behavior of individual D-g-PNIPAM and the nanohybrid system D-g-PNIPAM/silver nanoparticles has been done in the temperature range near the lower critical solution temperature (LCST). The methods of Dynamic Light Scattering, small angle X-ray scattering, and UV-VIS absorption spectroscopy have been used. The existence of single nanoparticles and aggregated nanoparticles located in a limited polymer macromolecular volume was established. The increase of the temperature leads to slight aggregation of the silver nanoparticles at the LCST transition. Single nanoparticles do not aggregate with the temperature increase. The thermally induced collapse of end-grafted poly(N-isopropylacrylamide) chains above the LCST do not affect significantly the size characteristics of silver nanoparticles incorporated into the polymer matrix.