title: Unexpected Temperature Behavior of Polyethylene Glycol Spacers in Copolymer Dendrimers in Chloroform
metadata.name: dc.contributor.author
metadata.value: Markelov, Denis A
metadata.lang: -
metadata.name: dc.contributor.author
metadata.value: Matveev, Vladimir V
metadata.lang: -
metadata.name: dc.contributor.author
metadata.value: Ingman, Petri
metadata.lang: -
metadata.name: dc.contributor.author
metadata.value: Nikolaeva, Marianna N
metadata.lang: -
metadata.name: dc.contributor.author
metadata.value: Penkova, Anastasia V
metadata.lang: -
metadata.name: dc.contributor.author
metadata.value: Lahderanta, Erkki
metadata.lang: -
metadata.name: dc.contributor.author
metadata.value: Boiko, Natalia I
metadata.lang: -
metadata.name: dc.contributor.author
metadata.value: Chizhik, Vladimir I
metadata.lang: -
metadata.name: dc.date.accessioned
metadata.value: 2016-09-27T14:49:06Z
metadata.lang: -
metadata.name: dc.date.available
metadata.value: 2016-09-27T14:49:06Z
metadata.lang: -
metadata.name: dc.date.issued
metadata.value: 2016
metadata.lang: -
metadata.name: dc.identifier
metadata.value: 10.1038/srep24270
metadata.lang: -
metadata.name: dc.identifier.issn
metadata.value: 10.1038/srep24270
metadata.lang: -
metadata.name: dc.identifier.issn
metadata.value: 10.1038/srep24270
metadata.lang: -
metadata.name: dc.identifier.uri
metadata.value: http://hdl.handle.net/11701/3884
metadata.lang: -
metadata.name: dc.description.abstract
metadata.value: We have studied copolymer dendrimer structure: carbosilane dendrimers with terminal phenylbenzoate mesogenic groups attached by poly(ethylene) glycol (PEG) spacers. In this system PEG spacers are additional tuning to usual copolymer structure: dendrimer with terminal mesogenic groups. The dendrimer macromolecules were investigated in a dilute chloroform solution by (1)H NMR methods (spectra and relaxations). It was found that the PEG layer in G = 5 generations dendrimer is "frozen" at high temperatures (above 260 K), but it unexpectedly becomes "unfrozen" at temperatures below 250 K (i.e., melting when cooling). The transition between these two states occurs within a small temperature range (~10 K). Such a behavior is not observed for smaller dendrimer generations (G = 1 and 3). This effect is likely related to the low critical solution temperature (LCST) of PEG and is caused by dendrimer conformations, in which the PEG group concentration in the layer increases with growing G. We suppose that the unusual behavior of PEG fragments in dendrimers will be interesting for practical applications such as nanocontainers or nanoreactors.
metadata.lang: en_GB
metadata.name: dc.language.iso
metadata.value: en
metadata.lang: en_GB
metadata.name: dc.publisher
metadata.value: Scientific Reports
metadata.lang: en_GB
metadata.name: dc.relation.ispartofseries
metadata.value: 6:24270;
metadata.lang: -
metadata.name: dc.title
metadata.value: Unexpected Temperature Behavior of Polyethylene Glycol Spacers in Copolymer Dendrimers in Chloroform
metadata.lang: en_GB
metadata.name: dc.type
metadata.value: Article
metadata.lang: en_GB
resources.filename: Markelov_SciRep_2016.pdf
resources.url: https://dspace.spbu.ru/bitstream/11701/3884/1/Markelov_SciRep_2016.pdf
resources.format: Adobe PDF
resources.size: 1,95 MB