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Statements

Subject Item
n2:RIV%2F61388955%3A_____%2F08%3A00309686%21RIV09-AV0-61388955
rdf:type
n14:Vysledek skos:Concept
dcterms:description
Conjugated polymers attract a particular attention as functional materials for electronics, photonics, and related applications as well as for gas separation and pervaporation membranes.[1-5] These polymers are usually prepared by coordination polymerization of corresponding alkynes induced with homogeneous catalysts. The increased requirements for a high purity of these polymers, especially for a low level of catalyst residues, initiated the investigation of heterogeneous catalysts, the application of which enables easy and complete separation of produced polymers from catalysts.[6] Rh complexes immobilized on polymeric supports[7][8] and/or mesoporous molecular sieves[9][10] have been successfully used for polymerization of phenylacetylene and its derivatives into polymers of high purity. These catalysts failed, however, in polymerization of aliphatic alkynes. Conjugated polymers attract a particular attention as functional materials for electronics, photonics, and related applications as well as for gas separation and pervaporation membranes.[1-5] These polymers are usually prepared by coordination polymerization of corresponding alkynes induced with homogeneous catalysts. The increased requirements for a high purity of these polymers, especially for a low level of catalyst residues, initiated the investigation of heterogeneous catalysts, the application of which enables easy and complete separation of produced polymers from catalysts.[6] Rh complexes immobilized on polymeric supports[7][8] and/or mesoporous molecular sieves[9][10] have been successfully used for polymerization of phenylacetylene and its derivatives into polymers of high purity. These catalysts failed, however, in polymerization of aliphatic alkynes. 3-Ethynylthiofene (3ETh) byl polymerizován s Rh(I)komplexy: [Rh(cod)acac], [Rh(nbd)acac], [Rh(cod)Cl]2 a [Rh(nbd)Cl]2 (cod je .eta.2:.eta.2-cycloocta-1,5-diene a nbd je .eta.2:.eta.2-norborna-2,5-diene) použitými jako homogenní katalyzátory a s kompexy [Rh(cod)Cl]2 a [Rh(nbd)Cl]2 imobilizovanými na mezoporézním polybenzimidazolu použitými jako heterogenní katalyzátory. Všechny testované katalyzátory poskytly poly(3ETh) s vysokým obsahem cis dvojných vazeb. In situ NMR studium homogenních polymerizací iniciovaných [Rh(cod)acac] a [Rh(nbd)acac] komplexy ukázalo: (i) že transformace acac ligandů na volný acetylaceton (Hacac) nastává již v počátečním stadiu polymerizace, což naznačuje, že tato reakce je součástí iniciace, (ii) že iniciace je pomalá v obou polymerizačních systémech a (iii) že v průběhu polymerizace dochází k uvolnění cod ligandu z [Rh(cod)acac] ale nikoli nbd ligandu z [Rh(nbd)acac].
dcterms:title
Polymerization of aliphatic alkynes with heterogeneous Mo catalysts supported on mesoporous molecular sieves Polymerization of aliphatic alkynes with heterogeneous Mo catalysts supported on mesoporous molecular sieves Polymerizace alifatických alkinů s heterogenními Mo katalyzátory nanesenými na mezoporézních molekulových sítech
skos:prefLabel
Polymerization of aliphatic alkynes with heterogeneous Mo catalysts supported on mesoporous molecular sieves Polymerization of aliphatic alkynes with heterogeneous Mo catalysts supported on mesoporous molecular sieves Polymerizace alifatických alkinů s heterogenními Mo katalyzátory nanesenými na mezoporézních molekulových sítech
skos:notation
RIV/61388955:_____/08:00309686!RIV09-AV0-61388955
n3:aktivita
n13:Z n13:P
n3:aktivity
P(GA203/05/2194), P(IAA4040411), P(KAN100400701), Z(AV0Z40400503), Z(MSM0021620857)
n3:cisloPeriodika
7
n3:dodaniDat
n11:2009
n3:domaciTvurceVysledku
n4:7016662 n4:3040291 n4:4766350
n3:druhVysledku
n16:J
n3:duvernostUdaju
n6:S
n3:entitaPredkladatele
n12:predkladatel
n3:idSjednocenehoVysledku
387411
n3:idVysledku
RIV/61388955:_____/08:00309686
n3:jazykVysledku
n17:eng
n3:klicovaSlova
alkyne polymerization; conjugated polymers; metathesis; Mo heterogeneous catalysts
n3:klicoveSlovo
n5:metathesis n5:conjugated%20polymers n5:alkyne%20polymerization n5:Mo%20heterogeneous%20catalysts
n3:kodStatuVydavatele
US - Spojené státy americké
n3:kontrolniKodProRIV
[986EA2F0A38E]
n3:nazevZdroje
Journal of Polymer Science. Part A - Polymer Chemistry
n3:obor
n18:CF
n3:pocetDomacichTvurcuVysledku
3
n3:pocetTvurcuVysledku
5
n3:projekt
n7:GA203%2F05%2F2194 n7:IAA4040411 n7:KAN100400701
n3:rokUplatneniVysledku
n11:2008
n3:svazekPeriodika
46
n3:tvurceVysledku
Čejka, Jiří Topka, Pavel Sedláček, J. Balcar, Hynek Zedník, J.
n3:wos
000254587500028
n3:zamer
n8:AV0Z40400503 n8:MSM0021620857
s:issn
0887-624X
s:numberOfPages
7