Über neue heterocyclische Farbstoffe

Fuchs, Karl; Grauaug, Egon

doi:10.1002/cber.19280610108

Cited by 15 publications

(2 citation statements)

References 7 publications

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“…Hence, to improve the intrinsic properties of wood in terms of dimensional instability, scientists started to investigate the possibilities to chemically modify the wood cell wall components already in the 1920s. 41 Most of the modifications, developed since the pioneering work by Fuchs, 42 are based on the same idea: if the cell wall environment is made more hydrophobic, the material will be less prone to water sorption. To reduce moisture fluctuations in the cell wall, there exist three main modes of action: cell wall bulking, cell wall modification, and lumen filling.…”

Section: Softwood and Hardwood Micro-and Nanostructurementioning

confidence: 99%

Bio-inspired functional wood-based materials – hybrids and replicates

Burgert

Cabane

Zollfrank

et al. 2015

International Materials Reviews

107

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Wood is a CO 2 storing material from renewable resoures with excellent mechanical properties and a sophisticated hierarchical structure from the nanoscale of cel l wall polymers up to the macroscale of tree size. In recent years, one can observe an increasing research interest in modifying and functionalising wood cell and cell wall assemblies as well as cell wall components. In this context, three fundamental approaches aiming at developing novel and advanced bioinspired and bio-based functional materials can be identified. At the level of bulk wood, this review will cover two research directions of wood functionalisation which have in common the utilisation of the hierarchical structure at different length scales, but differ in terms of the preservation of the organic scaffold of the w ood cel l wall. In those protocols that modify and functionalise wood cell walls with the emphasis on retaining their structural integrity, hybrid materials leading to polymer-or mineral-related wood products are developed. In the second wood functionalisation approach , the hierarchical structure of wood is used as a template to engineer wood-derived inorganic non-metallic materials. The third approach is at the level of cell wall components, where bio-based materials from wood cellulose nanofibres (CNF) are discussed. The use of CNF allows for designing structures with different porosities and new combinations of anisotropic properties beyond the predetermined hierarchical structure of wood. The review will cover fundamental aspects and various protocols for the three to date surprisingly separately treated approaches with a focus on synthesis procedures and characterisation of the modified materials with respect to the targeted functionalisation as

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Section: Softwood and Hardwood Micro-and Nanostructurementioning

confidence: 99%

Bio-inspired functional wood-based materials – hybrids and replicates

Burgert

Cabane

Zollfrank

et al. 2015

International Materials Reviews

107

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“…The higher the WPG, the higher the resistance to moisture, fungi, and termites. Acetylation has been the topic of research since 1928 [7,8].…”

Section: Introductionmentioning

confidence: 99%

Chemical Composition and FTIR Analysis of Acetylated Turkey Oak and Pannonia Poplar Wood

Fodor,

Hofmann

2024

Forests

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In this research, acetylation was applied under industrial conditions to improve the properties of Turkey oak and Pannonia poplar wood. Both species are potential “climate winners” in Hungary, yet they are currently underused due their low durability and poor dimensional stability. The acetylation modification process may be a suitable method to improve their properties. In order to verify the effectiveness of the process, comparative chemical analyses (cellulose, hemicelluloses, lignin, extractives, ash, buffering capacity, and pH) of the untreated and acetylated heartwood and sapwood were carried out for both species for the first time. Diffuse reflectance infrared Fourier transform (DRIFT) spectroscopy was also used to support the evaluation of the chemical analyses. The weight percent gain was 11.54% for poplar and 0.94% for Turkey oak, indicating poor treatment efficiency for the latter. The cellulose, hemicelluloses, and lignin contents changed significantly in poplar, with the highest change (+81%) induced by acetylating the hemicelluloses. Only the alpha-cellulose content decreased significantly in Turkey oak, presumably due to the degradation of the non-crystalline part of the cellulose. Acetylation may improve the resistance of Pannonia poplar against moisture, weather, decay, and wood-boring insects, but the process parameters need to be optimized in order to prevent degradation and discoloration in poplar. Turkey oak was found to be less suitable for acetylation due to its low permeability and tendency to crack.

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Heterocyclische Azofarbstoffe durch oxydative Kupplung

et al. 1958

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Analog zu p‐Phenylendiaminen kuppeln heterocyclische Hydrazone, soweit sie als (vinyloge) Amidrazone aufzufassen sind, oxydativ mit aromatischen Aminen, Phenolen und reaktiven Methylen‐Verbindungen zu Azofarbstoffen besonderen Typs. Mit Aldehyd‐hydrazonen entstehen Tetra‐aza‐pentamethin‐cyanine bzw. Dehydro‐formazane. Sowohl der Verlauf dieser sehr allgemeinen Reaktion als auch die Eigenschaften dieser durch direkte Azokupplung nicht zugänglichen Farbstoffe werden näher besprochen.

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Über neue heterocyclische Farbstoffe

Cited by 15 publications

References 7 publications

Bio-inspired functional wood-based materials – hybrids and replicates

Bio-inspired functional wood-based materials – hybrids and replicates

Chemical Composition and FTIR Analysis of Acetylated Turkey Oak and Pannonia Poplar Wood

Heterocyclische Azofarbstoffe durch oxydative Kupplung

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