Polyamidfasern

Vogler, Herbert

doi:10.1002/ciuz.201090056

Cited by 5 publications

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“…Amino acids are among the most versatile ingredients in functional materials, in natural peptides and proteins as well as in artificial synthetic materials, such as Nylon-6, Kevlar or switchable amide based foldamers to name a few. [1][2][3][4][5][6] Most of the functionality arises from the secondary (helices and sheets) and tertiary structures and the side chain functional groups. In our approach we incorporate functionalities like specialised redox, photo, magnetic or mechanical properties into the backbone of an oligoamide.…”

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confidence: 99%

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Porphyrin amino acids–amide coupling, redox and photophysical properties of bis(porphyrin) amides

et al. 2013

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New trans-AB2C meso-substituted porphyrin amino acid esters with meso-substituents of tunable electron withdrawing power (B = mesityl, 4-C6H4F, 4-C6H4CF3, C6F5) were prepared as free amines 3a-3d, as N-acetylated derivatives Ac-3a-Ac-3d and corresponding zinc(II) complexes Zn-Ac-3a-Zn-Ac-3d. Several amide-linked bis(porphyrins) with a tunable electron density at each porphyrin site were obtained from the amino porphyrin precursors by condensation reactions (4a-4d) and mono- and bis(zinc(II)) complexes Zn(2)-4d and Zn(1)Zn(2)-4d were prepared. The electronic interaction between individual porphyrin units in bis(porphyrins) 4 is probed by electrochemical experiments (CV, EPR), electronic absorption spectroscopy, steady-state and time-resolved fluorescence spectroscopy in combination with DFT/PCM calculations on diamagnetic neutral bis(porphyrins) 4 and on respective charged mixed-valent radicals 4(+/-). The interaction via the -C6H4-NHCO-C6H4- bridge, the site of oxidation and reduction and the lowest excited singlet state S1, is tuned by the substituents on the individual porphyrins and the metalation state.

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Section: Introductionmentioning

confidence: 99%

“…M Ar1 C 6 H 4 -R′ Q(0,0)/nm Q(0,1)/nm Φ τ /ns a a All decays are monoexponential; excitation wavelength λ exc = 400 and 550 nm. b n.d. = not determined.…”

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Porphyrin amino acids–amide coupling, redox and photophysical properties of bis(porphyrin) amides

et al. 2013

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Wettstreit um die Polyamidfasern

Vogler¹

2013

Chemie in nserer Zeit

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Besser aromatisch als aliphatisch

Vogler¹

2016

Chemie in nserer Zeit

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In den Labors der britischen Textilfirma Calico Printers Association stellten John Rex Whinfield und James Tennant Dickson vor 75 Jahren erstmals Fasern aus Polyethylenterephthalat her. Sie schufen damit die ersten wirtschaftlich erfolgreichen Polyesterfasern. Vorausgegangen waren Arbeiten des berühmten Faserchemikers Wallace Hume Carothers, der aber keine Fasern mit brauchbaren textilen Eigenschaften auffinden konnte. Carothes arbeitete mit aliphatischen Säuren, der Austausch dieser Säuren durch die aromatische Terephthalsäure führte zum Erfolg von Whinfield und Dickson. Die Entwicklung von großtechnisch einsetzbaren Verfahren zur Herstellung von Polyesterfasern erfolgte bei dem britischen Chemiekonzern ICI sowie bei der amerikanischen Firma Du Pont, die in den frühen 1950er Jahren die ersten Polyesterfasern auf den Markt brachten. Heute sind die Polyesterfasern die Synthesefasern mit den größten Produktionsmengen. Wichtigstes Herstellerland ist die Volksrepublik China.

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Polyamidfasern

Cited by 5 publications

References 1 publication

Porphyrin amino acids–amide coupling, redox and photophysical properties of bis(porphyrin) amides

Porphyrin amino acids–amide coupling, redox and photophysical properties of bis(porphyrin) amides

Wettstreit um die Polyamidfasern

Besser aromatisch als aliphatisch

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