Star-Shaped Poly(2-ethyl-2-oxazoline) and Poly(2-isopropyl-2-oxazoline) with Central Thiacalix[4]Arene Fragments: Reduction and Stabilization of Silver Nanoparticles.

Alexey Lezov,Marina Dudkina,Vladimir Kalganov,Igor Perevyazko,Stephanie Höppener,Alexander Gubarev,Andrey Ten’Kovtsev,Alexandra Lezova,Nikolay Tsvetkov,Tatyana Nekrasova,Larisa Andreeva,Nina Mikusheva,Maria Mikhailova,Yulia Gorshkova,Natalia Saprykina,Dmitriy Romanov,Ruslan Smyslov

doi:10.3390/polym11122006

Abstract

The interaction of silver nitrate with star-shaped poly(2-ethyl-2-oxazoline) and poly(2-isopropyl-2-oxazoline) containing central thiacalix[4]arene cores, which proceeds under visible light in aqueous solutions at ambient temperature, was studied. It was found that this process led to the formation of stable colloidal solutions of silver nanoparticles. The kinetics of the formation of the nanoparticles was investigated by the observation of a time-dependent increase in the intensity of the plasmon resonance peak that is related to the nanoparticles and appears in the range of 400 to 700 nm. According to the data of electron and X-ray spectroscopy, scanning and transmission electron microscopy, X-ray diffraction analysis, and dynamic light scattering, the radius of the obtained silver nanoparticles is equal to 30 nm. In addition, the flow birefringence experiments showed that solutions of nanoparticles have high optical shear coefficients.

Highlights

Biocompatible polymeric materials are actively investigated and applied in medicine and pharmaceutics
The SEM studies involved the star-PETOX and star-PIPOX-based samples obtained at nAg /nS = 0.1
Star-PIPOX-based samples obtained at nAg/ndeposited. In both The cases, considerable amounts of sphericaland nanoparticles were observed in the samples both cases, considerable amounts of spherical were observed in the samples on 0.1

Summary

Introduction

Biocompatible polymeric materials are actively investigated and applied in medicine and pharmaceutics. One important application of temperature-responsive polymers is the development of drug delivery systems that can release drugs in a controlled manner under the action of temperatures close to the physiological temperature of the human body. Poly(2-oxazoline)s are temperature-responsive and biocompatible polymers, which can be used as a versatile tool for designing polymer objects with complex architecture and adjustable physico-chemical properties [1,2,3,4]. Poly(2-oxazoline)s can be considered as substitutes for poly(ethylene glycol) (PEG) in medicine [5,6]. They have already found applications in the synthesis of hydrogels [7]; these systems may be used as implants

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Conclusion