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Unexpected Temperature Behavior of Polyethylene Glycol Spacers in Copolymer Dendrimers in Chloroform. / Markelov, Denis A.; Matveev, Vladimir V.; Ingman, Petri; Nikolaeva, Marianna N.; Penkova, Anastasia V.; Lahderanta, Erkki; Boiko, Natalia I.; Chizhik, Vladimir I.

In: Scientific Reports, Vol. 6, No. 24270, 24270, 2016.

Research output: Contribution to journal › Article › peer-review

Harvard

Markelov, DA, Matveev, VV, Ingman, P, Nikolaeva, MN, Penkova, AV, Lahderanta, E, Boiko, NI & Chizhik, VI 2016, 'Unexpected Temperature Behavior of Polyethylene Glycol Spacers in Copolymer Dendrimers in Chloroform', Scientific Reports, vol. 6, no. 24270, 24270. https://doi.org/10.1038/srep24270

APA

Markelov, D. A., Matveev, V. V., Ingman, P., Nikolaeva, M. N., Penkova, A. V., Lahderanta, E., Boiko, N. I., & Chizhik, V. I. (2016). Unexpected Temperature Behavior of Polyethylene Glycol Spacers in Copolymer Dendrimers in Chloroform. Scientific Reports, 6(24270), [24270]. https://doi.org/10.1038/srep24270

Vancouver

Markelov DA, Matveev VV, Ingman P, Nikolaeva MN, Penkova AV, Lahderanta E et al. Unexpected Temperature Behavior of Polyethylene Glycol Spacers in Copolymer Dendrimers in Chloroform. Scientific Reports. 2016;6(24270). 24270. https://doi.org/10.1038/srep24270

Author

Markelov, Denis A. ; Matveev, Vladimir V. ; Ingman, Petri ; Nikolaeva, Marianna N. ; Penkova, Anastasia V. ; Lahderanta, Erkki ; Boiko, Natalia I. ; Chizhik, Vladimir I. / Unexpected Temperature Behavior of Polyethylene Glycol Spacers in Copolymer Dendrimers in Chloroform. In: Scientific Reports. 2016 ; Vol. 6, No. 24270.

BibTeX

@article{3637b305aee04cb7893ae52751e92379,
title = "Unexpected Temperature Behavior of Polyethylene Glycol Spacers in Copolymer Dendrimers in Chloroform",
abstract = "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 1H 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 behav",
author = "Markelov, {Denis A.} and Matveev, {Vladimir V.} and Petri Ingman and Nikolaeva, {Marianna N.} and Penkova, {Anastasia V.} and Erkki Lahderanta and Boiko, {Natalia I.} and Chizhik, {Vladimir I.}",
year = "2016",
doi = "10.1038/srep24270",
language = "English",
volume = "6",
journal = "Scientific Reports",
issn = "2045-2322",
publisher = "Nature Publishing Group",
number = "24270",

}

RIS

TY - JOUR

T1 - Unexpected Temperature Behavior of Polyethylene Glycol Spacers in Copolymer Dendrimers in Chloroform

AU - Markelov, Denis A.

AU - Matveev, Vladimir V.

AU - Ingman, Petri

AU - Nikolaeva, Marianna N.

AU - Penkova, Anastasia V.

AU - Lahderanta, Erkki

AU - Boiko, Natalia I.

AU - Chizhik, Vladimir I.

PY - 2016

Y1 - 2016

N2 - 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 1H 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 behav

AB - 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 1H 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 behav

U2 - 10.1038/srep24270

DO - 10.1038/srep24270

M3 - Article

VL - 6

JO - Scientific Reports

JF - Scientific Reports

SN - 2045-2322

IS - 24270

M1 - 24270

ER -

ID: 7559972