Investigating the Effect of Structural Changes of Alkali Lignins Caused by Reduction and Methylation Reaction on the Optical Characteristics of Lignin-Containing Papers

In this study, changes in optical behavior of poplar Kraft lignin and bagasse Soda lignin, before and after reducing with sodium borohydride and sodium hydrosulfite (dithionite) and also after methylation using dimethyl sulfate, was monitored by measuring optical indices (brightness, k/s, whiteness...

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Autor principal:	Ahmad Mirshokraei
Formato:	article
Lenguaje:	FA
Publicado:	Regional Information Center for Science and Technology (RICeST) 2010
Materias:	poplar Kraft lignin bagasse Soda lignin lignin-containing papers sodium borohydride sodium hydrosulfite methylation reactions optical indices Forestry SD1-669.5
Acceso en línea:	https://doaj.org/article/aa689a96bda94cf19a8f28de04081246
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spelling	oai:doaj.org-article:aa689a96bda94cf19a8f28de040812462021-12-02T05:07:41ZInvestigating the Effect of Structural Changes of Alkali Lignins Caused by Reduction and Methylation Reaction on the Optical Characteristics of Lignin-Containing Papers1735-09132383-112X10.22092/ijwpr.2010.117260https://doaj.org/article/aa689a96bda94cf19a8f28de040812462010-03-01T00:00:00Zhttp://ijwpr.areeo.ac.ir/article_117260_26fc52175dd7a1563d0e3c4e6dc22c5a.pdfhttps://doaj.org/toc/1735-0913https://doaj.org/toc/2383-112XIn this study, changes in optical behavior of poplar Kraft lignin and bagasse Soda lignin, before and after reducing with sodium borohydride and sodium hydrosulfite (dithionite) and also after methylation using dimethyl sulfate, was monitored by measuring optical indices (brightness, k/s, whiteness and Post-Color numbers) of impregnated papers following accelerated thermal aging. The structural changes in lignins caused by reductive reactions, were mostly verified by using absorbance changes (UV-Vis spectrometry) and FI-IR spectroscopy. It was observed that, regarding elimination of chromophoric carbonyl and quinone groups, sodium borohydride showed better and more sustainable performance than sodium hydrosulfite. Therefore, it could be inferred that to improve the brightness of lignin-containing papers and persistance of this brightness, sodium borohydride could exhibit more efficiency and higher applicability.Ahmad MirshokraeiRegional Information Center for Science and Technology (RICeST)articlepoplar Kraft ligninbagasse Soda ligninlignin-containing paperssodium borohydridesodium hydrosulfitemethylation reactionsoptical indicesForestrySD1-669.5FAتحقیقات علوم چوب و کاغذ ایران, Vol 26, Iss 1, Pp 10-25 (2010)
institution	DOAJ
collection	DOAJ
language	FA
topic	poplar Kraft lignin bagasse Soda lignin lignin-containing papers sodium borohydride sodium hydrosulfite methylation reactions optical indices Forestry SD1-669.5
spellingShingle	poplar Kraft lignin bagasse Soda lignin lignin-containing papers sodium borohydride sodium hydrosulfite methylation reactions optical indices Forestry SD1-669.5 Ahmad Mirshokraei Investigating the Effect of Structural Changes of Alkali Lignins Caused by Reduction and Methylation Reaction on the Optical Characteristics of Lignin-Containing Papers
description	In this study, changes in optical behavior of poplar Kraft lignin and bagasse Soda lignin, before and after reducing with sodium borohydride and sodium hydrosulfite (dithionite) and also after methylation using dimethyl sulfate, was monitored by measuring optical indices (brightness, k/s, whiteness and Post-Color numbers) of impregnated papers following accelerated thermal aging. The structural changes in lignins caused by reductive reactions, were mostly verified by using absorbance changes (UV-Vis spectrometry) and FI-IR spectroscopy. It was observed that, regarding elimination of chromophoric carbonyl and quinone groups, sodium borohydride showed better and more sustainable performance than sodium hydrosulfite. Therefore, it could be inferred that to improve the brightness of lignin-containing papers and persistance of this brightness, sodium borohydride could exhibit more efficiency and higher applicability.
format	article
author	Ahmad Mirshokraei
author_facet	Ahmad Mirshokraei
author_sort	Ahmad Mirshokraei
title	Investigating the Effect of Structural Changes of Alkali Lignins Caused by Reduction and Methylation Reaction on the Optical Characteristics of Lignin-Containing Papers
title_short	Investigating the Effect of Structural Changes of Alkali Lignins Caused by Reduction and Methylation Reaction on the Optical Characteristics of Lignin-Containing Papers
title_full	Investigating the Effect of Structural Changes of Alkali Lignins Caused by Reduction and Methylation Reaction on the Optical Characteristics of Lignin-Containing Papers
title_fullStr	Investigating the Effect of Structural Changes of Alkali Lignins Caused by Reduction and Methylation Reaction on the Optical Characteristics of Lignin-Containing Papers
title_full_unstemmed	Investigating the Effect of Structural Changes of Alkali Lignins Caused by Reduction and Methylation Reaction on the Optical Characteristics of Lignin-Containing Papers
title_sort	investigating the effect of structural changes of alkali lignins caused by reduction and methylation reaction on the optical characteristics of lignin-containing papers
publisher	Regional Information Center for Science and Technology (RICeST)
publishDate	2010
url	https://doaj.org/article/aa689a96bda94cf19a8f28de04081246
work_keys_str_mv	AT ahmadmirshokraei investigatingtheeffectofstructuralchangesofalkaliligninscausedbyreductionandmethylationreactionontheopticalcharacteristicsoflignincontainingpapers
_version_	1718400613992103936

Investigating the Effect of Structural Changes of Alkali Lignins Caused by Reduction and Methylation Reaction on the Optical Characteristics of Lignin-Containing Papers

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