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Statements

Subject Item
n2:RIV%2F00216208%3A11310%2F13%3A10134319%21RIV14-GA0-11310___
rdf:type
skos:Concept n16:Vysledek
rdfs:seeAlso
http://dx.doi.org/10.1016/j.polymdegradstab.2013.05.020
dcterms: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 MWof 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 enriched in 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 if PdFPhA is allowed to age in the solid state. The suppression of the cis-to-trans isomerization reflects the suppression of motion of the polymer chains segments in the solid state. 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 MWof 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 enriched in 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 if PdFPhA is allowed to age in the solid state. The suppression of the cis-to-trans isomerization reflects the suppression of motion of the polymer chains segments in the solid state.
dcterms:title
Degradation and cis-to-trans isomerization of Poly[(2,4-difluorophenyl)acetylene]s of various initial molecular weight: SEC, NMR, DLS and EPR study Degradation and cis-to-trans isomerization of Poly[(2,4-difluorophenyl)acetylene]s of various initial molecular weight: SEC, NMR, DLS and EPR study
skos:prefLabel
Degradation and cis-to-trans isomerization of Poly[(2,4-difluorophenyl)acetylene]s of various initial molecular weight: SEC, NMR, DLS and EPR study Degradation and cis-to-trans isomerization of Poly[(2,4-difluorophenyl)acetylene]s of various initial molecular weight: SEC, NMR, DLS and EPR study
skos:notation
RIV/00216208:11310/13:10134319!RIV14-GA0-11310___
n16:predkladatel
n17:orjk%3A11310
n3:aktivita
n9:I n9:P n9:Z
n3:aktivity
I, P(GAP108/11/1661), Z(MSM0021620857)
n3:cisloPeriodika
9
n3:dodaniDat
n4:2014
n3:domaciTvurceVysledku
n7:5303583 n7:5069173 n7:8960488 n7:4102274
n3:druhVysledku
n22:J
n3:duvernostUdaju
n19:S
n3:entitaPredkladatele
n8:predkladatel
n3:idSjednocenehoVysledku
68208
n3:idVysledku
RIV/00216208:11310/13:10134319
n3:jazykVysledku
n13:eng
n3:klicovaSlova
Degradation; Conjugated polymers; 1,3,5-Tris(2,4-difluorophenyl)benzene
n3:klicoveSlovo
n5:Conjugated%20polymers n5:4-difluorophenyl%29benzene n5:5-Tris%282 n5:1 n5:Degradation n5:3
n3:kodStatuVydavatele
NL - Nizozemsko
n3:kontrolniKodProRIV
[2ECBE88C4318]
n3:nazevZdroje
Polymer Degradation and Stability
n3:obor
n20:CF
n3:pocetDomacichTvurcuVysledku
4
n3:pocetTvurcuVysledku
5
n3:projekt
n21:GAP108%2F11%2F1661
n3:rokUplatneniVysledku
n4:2013
n3:svazekPeriodika
98
n3:tvurceVysledku
Sedláček, Jan Matějíček, Pavel Zedník, Jiří Horáček, Michal Trhlíková, Olga
n3:wos
000323464200035
n3:zamer
n11:MSM0021620857
s:issn
0141-3910
s:numberOfPages
13
n14:doi
10.1016/j.polymdegradstab.2013.05.020
n18:organizacniJednotka
11310