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Statements

Subject Item
n2:RIV%2F70883521%3A28110%2F05%3A63503764%21RIV06-MSM-28110___
rdf:type
skos:Concept n13:Vysledek
dcterms:description
The susceptibility of aryl-substituted polysilylenes to photodegradation by UV radiation at two different degradation wavelength ? = 355 and 266 nm is examined on poly[methyl(phenyl)silylene] (PMPSi), poly[(biphenyl-4-yl)methylsilylene] (PBMSi) and copolymer poly-[methyl(phenyl)silylene{3(4)-[(2,4-dinitrophenylhydrazono)methyl]phenyl}methylsilylene] (PMPSi-DNPH). The photodegradation of PMPSi by UV radiation decreases the intensity of the exciton photoluminescence (PL) band. The temporal dependence is in accord with the idea of the scission of longer Si-Si segments at points of #weak bonds#. Both degradation wavelengths cause the creation of unsaturated bonds of different origin both forming metastable states, susceptible to anneal. In PBMSi and PMPSi-DNPH, the visible photoluminescence first decreased during the degradation by UV radiation, similarly to that as in PMPSi caused by the absorption decrease, but then the rise and saturation of PL was observed. The model for the observed temporal dependen Příspěvek studuje odolnost aryl substituovaných polysilanů vůči fotodegradaci UV zářením. Je dokumentována úloha slabých vazeb v metastabilitě i degradačních procesech. The susceptibility of aryl-substituted polysilylenes to photodegradation by UV radiation at two different degradation wavelength ? = 355 and 266 nm is examined on poly[methyl(phenyl)silylene] (PMPSi), poly[(biphenyl-4-yl)methylsilylene] (PBMSi) and copolymer poly-[methyl(phenyl)silylene{3(4)-[(2,4-dinitrophenylhydrazono)methyl]phenyl}methylsilylene] (PMPSi-DNPH). The photodegradation of PMPSi by UV radiation decreases the intensity of the exciton photoluminescence (PL) band. The temporal dependence is in accord with the idea of the scission of longer Si-Si segments at points of #weak bonds#. Both degradation wavelengths cause the creation of unsaturated bonds of different origin both forming metastable states, susceptible to anneal. In PBMSi and PMPSi-DNPH, the visible photoluminescence first decreased during the degradation by UV radiation, similarly to that as in PMPSi caused by the absorption decrease, but then the rise and saturation of PL was observed. The model for the observed temporal dependen
dcterms:title
UV degradability of aryl-substituted polysilylenes UV degradability of aryl-substituted polysilylenes UV degradabilita aryl-substituovaných polysilylenů
skos:prefLabel
UV degradabilita aryl-substituovaných polysilylenů UV degradability of aryl-substituted polysilylenes UV degradability of aryl-substituted polysilylenes
skos:notation
RIV/70883521:28110/05:63503764!RIV06-MSM-28110___
n3:strany
297-308
n3:aktivita
n15:Z n15:P
n3:aktivity
P(1P05ME729), Z(MSM7088352101)
n3:dodaniDat
n16:2006
n3:domaciTvurceVysledku
n14:5474353 n14:9902066 n14:8125562
n3:druhVysledku
n5:D
n3:duvernostUdaju
n17:S
n3:entitaPredkladatele
n11:predkladatel
n3:idSjednocenehoVysledku
548306
n3:idVysledku
RIV/70883521:28110/05:63503764
n3:jazykVysledku
n4:eng
n3:klicovaSlova
UV degradation; polysilanes; photoluminescence; metastability
n3:klicoveSlovo
n9:polysilanes n9:metastability n9:UV%20degradation n9:photoluminescence
n3:kontrolniKodProRIV
[10CD24E775D9]
n3:mistoKonaniAkce
Gothenburg, Sweden
n3:mistoVydani
Karlsruhe
n3:nazevZdroje
Natural and Arteficial Ageing of Polymers
n3:obor
n10:CD
n3:pocetDomacichTvurcuVysledku
3
n3:pocetTvurcuVysledku
4
n3:projekt
n20:1P05ME729
n3:rokUplatneniVysledku
n16:2005
n3:tvurceVysledku
Kuřitka, Ivo Nešpůrek, Stanislav Schauer, František Sáha, Petr
n3:typAkce
n21:WRD
n3:zahajeniAkce
2005-06-16+02:00
n3:zamer
n12:MSM7088352101
s:numberOfPages
12
n19:hasPublisher
Gesellschaft fuer Umweltsimulation e.V. GUS
n22:isbn
3-9808382-9-3
n8:organizacniJednotka
28110