Modification of cellulose fibres with organosilanes: Under what conditions does coupling occur?

Castellano, Maila; Gandini, Alessandro; Fabbri, Paola; Belgacem, Mohamed Naceur

doi:10.1016/j.jcis.2003.09.044

Cited by 149 publications

(94 citation statements)

References 15 publications

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“…It was found [21] that, contrary to previous shaky claims about their reactivity, the Si-OR function does not react with the cellulose hydroxy groups. On the other hand, partially hydrolysed and oligomerised siloxanes, bearing therefore some Si-OH groups, do condense with the cellulose OH counterparts, but even then, high temperatures are necessary to promote this reaction.…”

Section: Grafting With Polymerisable Moleculescontrasting

confidence: 74%

Surface Modification of Cellulose Fibres

Belgacem¹,

Gandini²

2008

Monomers, Polymers and Composites From Renewable Resources

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Section: Grafting With Polymerisable Moleculescontrasting

confidence: 74%

Surface Modification of Cellulose Fibres

Belgacem¹,

Gandini²

2008

Monomers, Polymers and Composites From Renewable Resources

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“…The formation of covalent bonds between lignin metal alkoxide is associated with a relative decrease of the lignin OH stretch band around 3400 cm -1 (Castellano et al 2004) and changes of the characteristic aromatic lignin bands around 1600 cm -1 (Rasmussen et al 2013). The changes for ZA-treated lignin (ZA+L) in Figure 3A and B are small.…”

Section: Spectra Of Coupling Agents and Ligninmentioning

confidence: 92%

Assessment of covalent bond formation between coupling agents and wood by FTIR spectroscopy and pull strength tests

et al. 2014

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Assessment of covalent bond formation between coupling agents and wood by FTIR spectroscopy and pull strength tests Abstract: In the focus was the question whether metal alkoxide coupling agents -titanium, silane, and zirconium -form covalent bonds to wood and how they improve coating adhesion. In a previous work, a downshift of the lignin infrared (IR) band ∼1600 cm -1 was shown to be consistent with the formation of ether linkages between lignin and titanium coupling agent. In the present work, changes were found in the attenuated total reflectance-Fourier transform IR (ATR-FTIR) spectra of lignin and wood mixed with silane, and titanium coupling agents, and to a lesser extent for a zirconium coupling agent. This was seen as evidence for covalent bonds between lignin phenolics and the coupling agents. No spectral changes were observed when the coupling agents were mixed with the wood constituents cellulose and hemicellulose. For verification of the results, a modified EN 311 wet adhesion pull strength test was performed with softwood panels painted with a solvent-borne alkyd/acrylic coating. The results revealed an improved adhesion for all tested coupling agents compared to the untreated reference. The spectroscopic and pull test results underline that the presence of the lignin moiety in wood is of central importance for improved wood coating adhesion.

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“…e drying step ensures removal of the solvent and induces the formation of the xerogel lm, which upon curing polymerises on the bre surface via a series of condensation reactions between the silanol groups, leading to the formation of the open hybrid polymeric network. ermal activation facilitates the evaporation of solvent molecules entrapped in the porous structure of the polymeric network and promotes polycondensation reactions between the silanol groups, enabling the fabrication of a highly crosslinked silsesquioxane polymeric system [22,25,26].…”

Section: Property Of R'mentioning

confidence: 99%