Determination of cellulose degree of polymerization in historical papers with high lignin content

Malešič, Jasna (avtor), Kraševec, Ida (avtor), Kralj Cigić, Irena (avtor)

Determination of cellulose degree of polymerization (DP) is one of the most commonly used methods in paper degradation studies, performed either by a standardized method using viscometry (as average degree of polymerization (DP$_v$)) or size-exclusion chromatography (SEC) (as weight average molecular mass (M$_w$)). Due to the insolubility of papers with high lignin content in cupriethylenediamine (CED), such as groundwood papers, viscometric determination is not possible; therefore, pretreatment is required to allow subsequent dissolution of the papers. In this study, the pretreatment of historical papers containing groundwood with sodium chlorite in acetic acid was investigated, which enables dissolution of the paper samples in CED and determination of the cellulose average degree of polymerization by viscometry (DP$_v$). Kappa number was determined to estimate the lignin content in the papers. The suitability of SEC UV-VIS analysis for determination of M$_w$ in papers with high lignin content had been verified before it was used as a comparative method for viscometry. Using SEC, changes in the weight average molecular mass (M$_w$) of cellulose tricarbanilate (CTC) derivative during delignification were evaluated. The results indicate that no significant depolymerization occurred in the selected samples under the studied delignification conditions, which was additionally confirmed with determination of monosaccharides by ion chromatography. The results of the M$_w$ determinations by SEC and DP$_v$ by viscometry are in good correlation, justifying the use of viscometry after chlorite/acetic acid pretreatment to determine the cellulose average degree of polymerization in historical papers with high lignin content.

• Jezik: Angleški jezik
• Ključne besede: weight average molecular mass, average degree of polymerization, cellulose, size-exclusion chromatography, lignin, viscometry, historical papers, chlorite/acetic acid
• Vrsta gradiva: Članek v reviji
• Tipologija: 1.01 - Izvirni znanstveni članek
• Organizacija: FKKT - Fakulteta za kemijo in kemijsko tehnologijo
• Status publikacije: Objavljeno
• Različica publikacije: Objavljena publikacija
• Leto izida: 2021
• Št. strani: 15 str.
• Številčenje: Vol. 13, iss. 12, art. 1990
• PID: 20.500.12556/RUL-135631
• UDK: 676.014.82
• ISSN pri članku: 2073-4360
• DOI: 10.3390/polym13121990
• COBISS.SI-ID: 67777283
• Datum objave v RUL: 22.03.2022

Gradivo je del revije

• Naslov: Polymers
• Skrajšan naslov: Polymers
• Založnik: MDPI
• ISSN: 2073-4360
• COBISS.SI-ID: 517951257

Licence

• Licenca: CC BY 4.0, Creative Commons Priznanje avtorstva 4.0 Mednarodna
• Povezava: http://creativecommons.org/licenses/by/4.0/deed.sl
• Opis: To je standardna licenca Creative Commons, ki daje uporabnikom največ možnosti za nadaljnjo uporabo dela, pri čemer morajo navesti avtorja.
• Začetek licenciranja: 17.06.2021

Sekundarni jezik

• Jezik: Slovenski jezik
• Ključne besede: masno povprečje molekulske mase, povprečna stopnja polimerizacije, celuloza, velikostna izključitvena kromatografija, lignin, viskozimetrija, klorit/ocetna kislina, historični papirji

Projekti

• Financer: ARRS - Agencija za raziskovalno dejavnost Republike Slovenije
• Številka projekta: P1-0153
• Naslov: Raziskave in razvoj analiznih metod in postopkov