Stability and aging of solubilized dialdehyde cellulose

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F70883521%3A28610%2F17%3A63516120" target="_blank" >RIV/70883521:28610/17:63516120 - isvavai.cz</a>

Výsledek na webu

<a href="https://link.springer.com/article/10.1007/s10570-017-1314-x" target="_blank" >https://link.springer.com/article/10.1007/s10570-017-1314-x</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1007/s10570-017-1314-x" target="_blank" >10.1007/s10570-017-1314-x</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Stability and aging of solubilized dialdehyde cellulose

Popis výsledku v původním jazyce

Derivatization of alpha cellulose by periodate oxidation is an useful method for production of dialdehyde cellulose (DAC). Conversion of the 2,3-hydroxyl groups to a pair of aldehyde groups along with cleavage of the C2–C3 bond of anhydroglucose unit reduces crystallinity of initial material, leaving DAC soluble in water under mild conditions. Solubilization in hot water is necessary to obtain product in solution. The first part of our work confirmed that solubilization causes severe degradation of the molecular weight of the polymer. However, the chemistry and processes within these solutions are currently poorly understood. In the main part of the study, products of periodate oxidation were identified in acidic DAC solutions by NMR spectroscopy for the first time. Subsequent investigation of the acidic DAC solution&apos;s aging demonstrated that the low pH of the DAC solution considerably slows the degradation processes, namely the decrease of reactive aldehyde group content when compared to previous studies. Large increase in the molecular weight, observed after 14 days of aging, was explained by formation of intermolecular hemiacetals. Our results demonstrate that pH-stabilized aqueous DAC solutions remained active (e.g. applicable for cross-linking reactions) even several weeks after preparation, therefore reducing the need to prepare a fresh solution each time.

Název v anglickém jazyce

Stability and aging of solubilized dialdehyde cellulose

Popis výsledku anglicky

Derivatization of alpha cellulose by periodate oxidation is an useful method for production of dialdehyde cellulose (DAC). Conversion of the 2,3-hydroxyl groups to a pair of aldehyde groups along with cleavage of the C2–C3 bond of anhydroglucose unit reduces crystallinity of initial material, leaving DAC soluble in water under mild conditions. Solubilization in hot water is necessary to obtain product in solution. The first part of our work confirmed that solubilization causes severe degradation of the molecular weight of the polymer. However, the chemistry and processes within these solutions are currently poorly understood. In the main part of the study, products of periodate oxidation were identified in acidic DAC solutions by NMR spectroscopy for the first time. Subsequent investigation of the acidic DAC solution&apos;s aging demonstrated that the low pH of the DAC solution considerably slows the degradation processes, namely the decrease of reactive aldehyde group content when compared to previous studies. Large increase in the molecular weight, observed after 14 days of aging, was explained by formation of intermolecular hemiacetals. Our results demonstrate that pH-stabilized aqueous DAC solutions remained active (e.g. applicable for cross-linking reactions) even several weeks after preparation, therefore reducing the need to prepare a fresh solution each time.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

20903 - Bioproducts (products that are manufactured using biological material as feedstock) biomaterials, bioplastics, biofuels, bioderived bulk and fine chemicals, bio-derived novel materials

Projekt

Výsledek vznikl pri realizaci vícero projektů. Více informací v záložce Projekty.

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2017

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Cellulose

ISSN

0969-0239

e-ISSN

—

Svazek periodika

24

Číslo periodika v rámci svazku

7

Stát vydavatele periodika

NL - Nizozemsko

Počet stran výsledku

14

Strana od-do

2753-2766

Kód UT WoS článku

000402697200007

EID výsledku v databázi Scopus

2-s2.0-85018789721