國立虎尾科技大學 |

Cellulose in Quaternary Ammonium Hydroxide Solutions : = Properties and Functionalisation.

Record Type:	Language materials, manuscript : Monograph/item
Title/Author:	Cellulose in Quaternary Ammonium Hydroxide Solutions :/
Reminder of title:	Properties and Functionalisation.
Author:	Naserifar, Shirin.
Description:	1 online resource (66 pages)
Notes:	Source: Masters Abstracts International, Volume: 83-07.
Contained By:	Masters Abstracts International83-07.
Subject:	Textile fibers. -
Online resource:	click for full text (PQDT)
ISBN:	9798802726310

Cellulose in Quaternary Ammonium Hydroxide Solutions : = Properties and Functionalisation.
Naserifar, Shirin.

Cellulose in Quaternary Ammonium Hydroxide Solutions :Properties and Functionalisation. - 1 online resource (66 pages)

Source: Masters Abstracts International, Volume: 83-07.

Thesis (Licentiate)--Chalmers Tekniska Hogskola (Sweden), 2022.

Includes bibliographical references

An ever-increasing demand to shift away from fossil-based feedstock towards renewable resources has led to more use of bio-based materials. Cellulose being the most abundant biopolymer on Earth has received a considerable attention with a wide range of applications (in textile fibers, films, membranes, etc.), many of which requiring processing through dissolution and/or chemical functionalisation. Cellulose cannot melt when heated or dissolve in the most common aqueous and organic solvents. Thus, a lot of efforts have been made to develop new and effective solvents aiming to address some common limitations associated with the existing solvents including solution instability, low dissolution capacity, specific temperature requirement, side reactions of the solvent itself and narrow concentration range required for the dissolution. Water solution of quaternary ammonium hydroxides (QAHs), classified as relatively green and economical chemicals, show promising potential in cellulose dissolution. In this thesis, to gain deeper insight on QAHs(aq) as derivatisation and dissolution media for cellulose, cellulose etherification in benzyltrimethylammonium hydroxide (Triton B) and tetramethylammonium hydroxide (TMAH), along with NaOH(aq) as well as different mixtures of these bases was investigated. In this study the emphasis was set on in-situ monitoring of the etherification reaction combined with the spectroscopic analysis of the products. The results highlighted the impact of hydroxide base composition on cellulose etherification where QAHs either alone or in combination enhanced the reagent solubility and cellulose solution stability during the reaction compared to NaOH which resulted in a lower solution stability promoting likely side reactions of the introduced substituents. Considering the importance of the dissolution system on functionalisation, a new solvent for cellulose was developed in the next study inspired by the well-known industrially used solvent N-methylmorpholine N-oxide (NMMO). In this study, N,N--dimethyl morpholinium and hydroxide ions were coupled to synthesize N,N-dimethylomorpholinium hydroxide(aq), and the dissolution properties of cellulose in the new solvent were investigated showing mostly molecularly dissolved cellulose chains with good chemical stability upon refrigeration.

Electronic reproduction.
Ann Arbor, Mich. :
ProQuest,
2024

Mode of access: World Wide Web

ISBN: 9798802726310Subjects--Topical Terms:

1022258
Textile fibers.
Index Terms--Genre/Form:

554714
Electronic books.

Cellulose in Quaternary Ammonium Hydroxide Solutions : = Properties and Functionalisation.
LDR:03532ntm a22003257 4500 001 1149468
005 20241022112104.5
006 m o d
007 cr bn ---uuuuu
008 250605s2022 xx obm 000 0 eng d
020 $a 9798802726310
035 $a (MiAaPQ)AAI29005687
035 $a (MiAaPQ)Chalmers_SE527542
035 $a AAI29005687
040 $a MiAaPQ $b eng $c MiAaPQ $d NTU
100 1 $a Naserifar, Shirin. $3 1475722
245 1 0 $a Cellulose in Quaternary Ammonium Hydroxide Solutions : $b Properties and Functionalisation.
264 0 $c 2022
300 $a 1 online resource (66 pages)
336 $a text $b txt $2 rdacontent
337 $a computer $b c $2 rdamedia
338 $a online resource $b cr $2 rdacarrier
500 $a Source: Masters Abstracts International, Volume: 83-07.
502 $a Thesis (Licentiate)--Chalmers Tekniska Hogskola (Sweden), 2022.
504 $a Includes bibliographical references
520 $a An ever-increasing demand to shift away from fossil-based feedstock towards renewable resources has led to more use of bio-based materials. Cellulose being the most abundant biopolymer on Earth has received a considerable attention with a wide range of applications (in textile fibers, films, membranes, etc.), many of which requiring processing through dissolution and/or chemical functionalisation. Cellulose cannot melt when heated or dissolve in the most common aqueous and organic solvents. Thus, a lot of efforts have been made to develop new and effective solvents aiming to address some common limitations associated with the existing solvents including solution instability, low dissolution capacity, specific temperature requirement, side reactions of the solvent itself and narrow concentration range required for the dissolution. Water solution of quaternary ammonium hydroxides (QAHs), classified as relatively green and economical chemicals, show promising potential in cellulose dissolution. In this thesis, to gain deeper insight on QAHs(aq) as derivatisation and dissolution media for cellulose, cellulose etherification in benzyltrimethylammonium hydroxide (Triton B) and tetramethylammonium hydroxide (TMAH), along with NaOH(aq) as well as different mixtures of these bases was investigated. In this study the emphasis was set on in-situ monitoring of the etherification reaction combined with the spectroscopic analysis of the products. The results highlighted the impact of hydroxide base composition on cellulose etherification where QAHs either alone or in combination enhanced the reagent solubility and cellulose solution stability during the reaction compared to NaOH which resulted in a lower solution stability promoting likely side reactions of the introduced substituents. Considering the importance of the dissolution system on functionalisation, a new solvent for cellulose was developed in the next study inspired by the well-known industrially used solvent N-methylmorpholine N-oxide (NMMO). In this study, N,N--dimethyl morpholinium and hydroxide ions were coupled to synthesize N,N-dimethylomorpholinium hydroxide(aq), and the dissolution properties of cellulose in the new solvent were investigated showing mostly molecularly dissolved cellulose chains with good chemical stability upon refrigeration.
533 $a Electronic reproduction. $b Ann Arbor, Mich. : $c ProQuest, $d 2024
538 $a Mode of access: World Wide Web
650 4 $a Textile fibers. $3 1022258
650 4 $a Cellulose. $3 678568
650 4 $a Solvents. $3 891167
650 4 $a Alternative energy. $3 1241221
650 4 $a Chemical engineering. $3 555952
655 7 $a Electronic books. $2 local $3 554714
690 $a 0542
690 $a 0363
710 2 $a ProQuest Information and Learning Co. $3 1178819
710 2 $a Chalmers Tekniska Hogskola (Sweden). $3 1372792
773 0 $t Masters Abstracts International $g 83-07.
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=29005687 $z click for full text (PQDT)