Degradation and cis-to-trans isomerization of poly[(2,4-difluorophenyl)acetylene]s of various initial molecular weight: SEC, NMR, DLS and EPR study

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61388955%3A_____%2F13%3A00421909" target="_blank" >RIV/61388955:_____/13:00421909 - isvavai.cz</a>
Result on the web
<a href="http://dx.doi.org/10.1016/j.polymdegradstab.2013.05.020" target="_blank" >http://dx.doi.org/10.1016/j.polymdegradstab.2013.05.020</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1016/j.polymdegradstab.2013.05.020" target="_blank" >10.1016/j.polymdegradstab.2013.05.020</a>

Result language
angličtina
Original language name
Degradation and cis-to-trans isomerization of poly[(2,4-difluorophenyl)acetylene]s of various initial molecular weight: SEC, NMR, DLS and EPR study
Original language description
Molecular weight (MW) and configurational stabilities of a series of high-cis poly[(2,4-difluorophenyl)acetylene]s (PdFPhA, Mw from 2.2 104 to 9.7 105) exposed to the atmosphere and diffuse daylight are reported. Polymers dissolved in THF-d8 undergo simultaneous cis-to-trans isomerization and degradation under formation of a bimodal MW distribution. Degradation and isomerization rates are tightly connected and decrease with decreasing MW of the parent PdFPhAs. This finding may be interesting for the functional applications of substituted polyacetylenes. The partly aged PdFPhAs contain two separable fractions: higher-MW high-cis macromolecules containing a low amount of unpaired electrons and lower-MW deeply isomerized cis/trans macromolecules enrichedin the unpaired electrons content. The difference in MW of these fractions reflects the various degradation rates of isomerized and high-cis macromolecules. Only a slow degradation without changes in the configurational structure proceeds
Czech name
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Czech description
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Type
J<sub>x</sub> - Unclassified - Peer-reviewed scientific article (Jimp, Jsc and Jost)
CEP classification
CF - Physical chemistry and theoretical chemistry
OECD FORD branch
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Project
<a href="/en/project/GAP108%2F11%2F1661" target="_blank" >GAP108/11/1661: Organic nanoporous polymers derived from arylacetylenes as materials for hydrogen storage</a><br>
Continuities
I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year
2013
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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