NDLI: Novel thermosensitive telechelic PEGs with antioxidant activity: synthesis, molecular properties and conformational behaviour

Content Provider	Royal Society of Chemistry (RSC)
Author	Domnina, Nina S. Stepanek, Petr Walterova, Zuzana Bogomolova, Anna Konarev, Petr V. Svergun, Dmitri I. Sergeeva, Olga Filippov, Sergey K. Vlasov, Petr S. Horsky, Jiri
Copyright Year	2014
Abstract	We report on the synthesis and solution properties of novel tailor-made polymer conjugates, which are highly compelling for biomedical applications due to their antioxidant activity and the potential to fine-tune their thermosensitive properties. These conjugates consist of polyethylene glycol (PEG) polymers containing antioxidant moieties, namely 3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate or 2-benzamido-3-(3,5-di-tert-butyl-4-hydroxyphenyl)acrylate, as end groups that differ in activity and hydrophobicity. It was shown that all of the synthesized conjugates have low critical solution temperatures (LCSTs) characteristic of type II polymers on a phase diagram. By simply varying the PEG molecular weight, the solution properties, including the LCST value, could be easily tuned across a broad temperature range of 20–90 °C, providing an ideal method for the creation of thermosensitive polymers. It was also established that the LCST value and the polymer conjugate conformation depend on the antioxidant structure. From dynamic light scattering and small-angle X-ray scattering data, we were able to construct a complete sequence diagram of the conformational phase behaviour of the polymers with increasing temperature. It was observed that the conjugate conformation changes are the result of water shifting from a thermodynamically favourable solvent to an unfavourable one. This process then leads to compaction of the conjugate, followed by its aggregation.
Starting Page	41763
Ending Page	41771
Page Count	9
File Format	HTM / HTML PDF
ISSN	20462069
Volume Number	4
Issue Number	79
Journal	RSC Advances
DOI	10.1039/c4ra06978a
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Dynamic light scattering Polyethylene glycol Phase diagram Propionic acid Acrylate Chemical structure Polymer Sequence diagram Hydrophobe Antioxidant Solvent Small-angle X-ray scattering
Content Type	Text
Resource Type	Article
Subject	Chemistry Chemical Engineering

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