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Statements

Subject Item
n2:RIV%2F00216224%3A14740%2F13%3A00069407%21RIV14-MSM-14740___
rdf:type
n8:Vysledek skos:Concept
dcterms:description
New non-hydrolytic sol-gel reactions providing hybrid organosilicate materials containing various polyphenolic structural motifs were developed. Mesoporous gels are formed in polycondensation reactions of multifunctional phenols, such as hydroquinone, 4,4-dihydroxybiphenyl, bisphenol A, and phloroglucinol with silicon(IV) acetate in polar ether solvent. Acetic acid was identified as a byproduct in elimination reactions. Xerogels were obtained by drying under vacuum. The produced materials contain residual acetoxy and phenolic hydroxyl groups allowing for subsequent grafting and surface modification. An impact of the employed spacer molecules and reaction conditions on the degree of condensation and xerogel porosity was studied. The condensation degree was established by gravimetric techniques and appears to be independent of reaction temperature but strongly depends on the nature of the spacer molecules. Hydroquinone provided gels with the highest value of 91%. New non-hydrolytic sol-gel reactions providing hybrid organosilicate materials containing various polyphenolic structural motifs were developed. Mesoporous gels are formed in polycondensation reactions of multifunctional phenols, such as hydroquinone, 4,4-dihydroxybiphenyl, bisphenol A, and phloroglucinol with silicon(IV) acetate in polar ether solvent. Acetic acid was identified as a byproduct in elimination reactions. Xerogels were obtained by drying under vacuum. The produced materials contain residual acetoxy and phenolic hydroxyl groups allowing for subsequent grafting and surface modification. An impact of the employed spacer molecules and reaction conditions on the degree of condensation and xerogel porosity was studied. The condensation degree was established by gravimetric techniques and appears to be independent of reaction temperature but strongly depends on the nature of the spacer molecules. Hydroquinone provided gels with the highest value of 91%.
dcterms:title
Porous organosilicates by non-hydrolytic sol-gel routes Porous organosilicates by non-hydrolytic sol-gel routes
skos:prefLabel
Porous organosilicates by non-hydrolytic sol-gel routes Porous organosilicates by non-hydrolytic sol-gel routes
skos:notation
RIV/00216224:14740/13:00069407!RIV14-MSM-14740___
n8:predkladatel
n14:orjk%3A14740
n5:aktivita
n18:P
n5:aktivity
P(ED1.1.00/02.0068), P(LH11028)
n5:dodaniDat
n13:2014
n5:domaciTvurceVysledku
n9:6417108 n9:2274329 n9:2451077
n5:druhVysledku
n16:O
n5:duvernostUdaju
n12:S
n5:entitaPredkladatele
n17:predkladatel
n5:idSjednocenehoVysledku
97241
n5:idVysledku
RIV/00216224:14740/13:00069407
n5:jazykVysledku
n10:eng
n5:klicovaSlova
non-hydrolytic; inorganic-organic; organosilicates
n5:klicoveSlovo
n6:organosilicates n6:inorganic-organic n6:non-hydrolytic
n5:kontrolniKodProRIV
[CDFC6D02419C]
n5:obor
n11:CA
n5:pocetDomacichTvurcuVysledku
3
n5:pocetTvurcuVysledku
4
n5:projekt
n7:ED1.1.00%2F02.0068 n7:LH11028
n5:rokUplatneniVysledku
n13:2013
n5:tvurceVysledku
Pinkas, Jiří Kejík, Martin Barnes, Craig Moravec, Zdeněk
n15:organizacniJednotka
14740