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Erschienen in: Journal of Sol-Gel Science and Technology 3/2020

01.04.2020 | Review Paper: Sol-gel, hybrids and solution chemistries

Di-urea cross-linked siloxane hybrid materials incorporating oligo(oxypropylene) and oligo(oxyethylene) chains

verfasst von: S. C. Nunes, M. Fernandes, H. M. R. Gonçalves, J. L. Serrano, P. Almeida, V. de Zea Bermudez

Erschienen in: Journal of Sol-Gel Science and Technology | Ausgabe 3/2020

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Abstract

Novel bridged silsesquioxanes (BSs) incorporating short oligo(oxypropylene) or oligo(oxyethylene) chains bonded to a siliceous network via urea cross-links were synthesized by the sol–gel process from the organosilane precursors (CH3CH2O)3-Si-(CH2)3-NHC(=O)NH-R-NH(O=C)NH-(CH2)3-Si-(OCH2CH3)3, with R≡-[CH(CH3)CH2O]xCH2CH(CH3)- (x∼2.5 and 6.1) or R≡-(CH2)2O(CH2)2O(CH2)2-, respectively. The new BSs were identified by the notations d-U′(Y′) with Y′ = 400 and 230, and d-U(Y) with Y = 148, where d stands for di, and U/U′ denote the urea group. The hybrid materials were produced as transparent, amorphous, homogeneous, and soft monoliths, although d-U(148) presented some rigidity. In the three samples the siliceous framework is mainly composed of [–(CH2)Si(OSi)3] and [–(CH2)Si(OSi)2(OH)] substructures. The highest polycondensation degree of the siloxane network was found in the case of d-U′(400), pointing out the formation of a three dimensional framework. In the three materials the urea groups are extensively involved in the formation of strong ordered urea-urea hydrogen-bonded aggregates of different degree of order. The d-U′(230) BS is a promising candidate as mold material for micropatterning applications aiming the fabrication of smart coatings. The prospects for these materials in flexible electrochromic devices for smart windows, where they can act as outermost substrates, are also excellent.

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Metadaten
Titel
Di-urea cross-linked siloxane hybrid materials incorporating oligo(oxypropylene) and oligo(oxyethylene) chains
verfasst von
S. C. Nunes
M. Fernandes
H. M. R. Gonçalves
J. L. Serrano
P. Almeida
V. de Zea Bermudez
Publikationsdatum
01.04.2020
Verlag
Springer US
Erschienen in
Journal of Sol-Gel Science and Technology / Ausgabe 3/2020
Print ISSN: 0928-0707
Elektronische ISSN: 1573-4846
DOI
https://doi.org/10.1007/s10971-020-05272-5

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