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

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rdf:type	skos:Concept http://linked.opendata.cz/ontology/domain/vavai/Vysledek
rdfs:seeAlso	http://dx.doi.org/10.1016/j.polymdegradstab.2013.05.020
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. (en)
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 (en)
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 (en)
skos:notation	RIV/00216208:11310/13:10134319!RIV14-GA0-11310___
http://linked.open...avai/predkladatel	Přírodovědecká fakulta
http://linked.open...avai/riv/aktivita	I P Z
http://linked.open...avai/riv/aktivity	I, P(GAP108/11/1661), Z(MSM0021620857)
http://linked.open...iv/cisloPeriodika	9
http://linked.open...vai/riv/dodaniDat	2014
http://linked.open...aciTvurceVysledku	Matějíček, Pavel Zedník, Jiří Sedláček, Jan Trhlíková, Olga
http://linked.open.../riv/druhVysledku	J - Článek v odborném periodiku
http://linked.open...iv/duvernostUdaju	S - Úplné a pravdivé údaje nepodléhající ochraně podle zvláštních právních předpisů
http://linked.open...titaPredkladatele	Univerzita Karlova v Praze / Přírodovědecká fakulta
http://linked.open...dnocenehoVysledku	68208
http://linked.open...ai/riv/idVysledku	RIV/00216208:11310/13:10134319
http://linked.open...riv/jazykVysledku	eng - angličtina
http://linked.open.../riv/klicovaSlova	Degradation; Conjugated polymers; 1,3,5-Tris(2,4-difluorophenyl)benzene (en)
http://linked.open.../riv/klicoveSlovo	4-difluorophenyl)benzene 5-Tris(2 1 Conjugated polymers Degradation 3
http://linked.open...odStatuVydavatele	NL - Nizozemsko
http://linked.open...ontrolniKodProRIV	[2ECBE88C4318]
http://linked.open...i/riv/nazevZdroje	Polymer Degradation and Stability
http://linked.open...in/vavai/riv/obor	CF
http://linked.open...ichTvurcuVysledku	4 (xsd:int)
http://linked.open...cetTvurcuVysledku	5 (xsd:int)
http://linked.open...vavai/riv/projekt	Organic nanoporous polymers derived from arylacetylenes as materials for hydrogen storage
http://linked.open...UplatneniVysledku	2013
http://linked.open...v/svazekPeriodika	98
http://linked.open...iv/tvurceVysledku	Matějíček, Pavel Sedláček, Jan Horáček, Michal Trhlíková, Olga Zedník, Jiří
http://linked.open...ain/vavai/riv/wos	000323464200035
http://linked.open...n/vavai/riv/zamer	Nové molekulární systémy pro pokročilé aplikace prospěšné pro zdraví a šetrné k životnímu prostředí
issn	0141-3910
number of pages	13 (xsd:int)
http://bibframe.org/vocab/doi	10.1016/j.polymdegradstab.2013.05.020
http://localhost/t...ganizacniJednotka	11310

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