New hybrid silsesquioxane materials with sterically hindered carbosilane side groups

Kowalewska, Anna; Fortuniak, Witold; Handke, B.

doi:10.1016/j.jorganchem.2008.12.027

Cited by 25 publications

(14 citation statements)

References 75 publications

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“…Octahedral POSS-amide-Py exhibited not only melting at around T m = 104 °C but also a glass transition (T g = 3 °C) ( Figure S5 ). It may be explained by adjustment of more flexible segments in the crystal structure, analogously to that observed in macromolecular systems [ 52 , 53 , 54 ].…”

Section: Resultsmentioning

confidence: 94%

Hybrid Fluorescent Poly(silsesquioxanes) with Amide- and Triazole-Containing Side Groups for Light Harvesting and Cation Sensing

2020

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Hybrid polymers containing pyrene (Py) units bound to linear poly(silsesquioxane) (LPSQ) chains through flexible linkers containing heteroatoms (S, N, O) (LPSQ-triazole-Py and LPSQ-amide-Py) exhibit intense fluorescence emission, both in very diluted solutions (c = 10-8 mol/L) and in the solid state. The materials are thermally stable and exhibit good thin film forming abilities. Their optical and physicochemical properties were found to be strongly dependent on the structure of the side chains. Comparative studies with octahedral silsesquioxane (POSS) analogues (POSS-triazole-Py and POSS-amide-Py) emphasized the role of the specific double-strand architecture of the LPSQ backbone and distribution of side Py groups for their photo-luminescent properties. The new hybrid materials were tested as fluorescence energy donors to red-emitting dyes (Nile Red and Coumarine 6). All the silsesquioxanes studied were found to be able to transfer FL emission energy to Coumarin 6, irrespectively of their spatial structure. However, due to the differences in the wavelength range of FL emission, only LPSQ-triazole-Py were able to act as energy donors to Nile Red. The Py-grafted LPSQ may be also applied for development of soluble and highly emissive chemosensors. Their fluorescent nature was explored for the detection of Cu(II), Fe(III), Co(II), Ag(I), Hg(II), Mg(II), Ca(II), Pb(II) and Zn(II). The morphology of the side chains and hydrogen-bonding interactions influenced the sensing capacity of all the studied materials.

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Section: Resultsmentioning

confidence: 94%

Hybrid Fluorescent Poly(silsesquioxanes) with Amide- and Triazole-Containing Side Groups for Light Harvesting and Cation Sensing

2020

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“…Hydride terminated dimethylsiloxane hexadecamer was obtained by trifluoromethanesulfonic acid catalysed ring opening polymerization of octamethylcyclotetrasiloxane with 1,1,3,3-tetramethyldisiloxane used as a chain stopper. 6-[tris(trimethylsilyl)]-hex-1-ene [4] and tris(trimethylsilyl)(vinyldimethylsilyl)methane [8] were prepared according to the respective literature procedures. Toluene [analytic grade, POCh (Polish Chemical Reagents)], which was used as a solvent in the hydrosilylation reaction, was carefully dried according to the literature procedures [30] and distilled prior to use.…”

Section: Methodsmentioning

confidence: 99%

“…Carbosilane derivatives of the tris(trimethylsilyl)methyl (Tsi) moiety, due to their exceptional steric hindrance, have been extensively used both in organometallic [1,2] and polymer chemistry [3][4][5][6][7][8][9][10][11][12]. Tsi-modified polymeric materials exhibit quite unique properties.…”

Section: Introductionmentioning

confidence: 99%

“…Tsi-modified polymeric materials exhibit quite unique properties. For example, a specific change in mobility of Me 3 Si groups results in a distinct γ-type relaxation transition in ladder Tsi-silsesquioxanes, discernible by the differential calorimetry method [8]. The properties, that can be brought in by Tsi functions are of special interest regarding siloxane polymers.…”

Section: Introductionmentioning

confidence: 99%

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Polymer Chain Relaxation Mechanisms in Siloxane-Carbosilane Systems

Kowalewska

Kaźmierski

Delczyk-Olejniczak

2011

Silicon

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The effect of sterically hindered carbosilane moieties, situated as end groups in telechelic oligodimethylsiloxanes, was investigated with respect to the mobility of silicon atoms in the main chain. The relaxation phenomena in such crowded systems were studied by DSC and NMR methods. Spin-lattice relaxation times T 1 ( 29 Si NMR) of silicon atoms in the oligomer chain were estimated and related to the distance between a given siloxane unit and the carbosilane moiety. It was found that the mobility of terminal siloxane units has been substantially affected. However, in the long range, the effect does not to seem to outweigh the intrinsic flexibility of the siloxane bonds.

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“…There have been many publications in recent years on the subject of hybrid polymer composites [1,2,3,4,5,6,7,8,9]. The main reason for the interest in this area is the possibility of developing materials with higher rigidity and impact resistance.…”

Section: Introductionmentioning

confidence: 99%

Epoxy Resin Composite Based on Functional Hybrid Fillers

et al. 2014

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A study was carried out involving the filling of epoxy resin (EP) with bentonites and silica modified with polyhedral oligomeric silsesquioxane (POSS). The method of homogenization and the type of filler affect the functional and canceling properties of the composites was determined. The filler content ranged from 1.5% to 4.5% by mass. The basic mechanical properties of the hybrid composites were found to improve, and, in particular, there was an increase in tensile strength by 44%, and in Charpy impact strength by 93%. The developed hybrid composites had characteristics typical of polymer nanocomposites modified by clays, with a fine plate morphology of brittle fractures observed by SEM, absence of a plate separation peak in Wide Angles X-ray Scattering (WAXS) curves, and an exfoliated structure observed by TEM.

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New hybrid silsesquioxane materials with sterically hindered carbosilane side groups

Cited by 25 publications

References 75 publications

Hybrid Fluorescent Poly(silsesquioxanes) with Amide- and Triazole-Containing Side Groups for Light Harvesting and Cation Sensing

Hybrid Fluorescent Poly(silsesquioxanes) with Amide- and Triazole-Containing Side Groups for Light Harvesting and Cation Sensing

Polymer Chain Relaxation Mechanisms in Siloxane-Carbosilane Systems

Epoxy Resin Composite Based on Functional Hybrid Fillers

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