東華大學圖書館 |

Language: English

Help

回圖書館首頁

手機版館藏查詢

Back

Switch To: Labeled | MARC Mode | ISBD

Linked to FindBook

Google Book

Amazon

博客來

Interactions Between Water and Cellulose Esters : = The Effect of the Acyl Side-chain Length.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Interactions Between Water and Cellulose Esters :/
Reminder of title:	The Effect of the Acyl Side-chain Length.
Author:	Nilsson, Robin.
Description:	1 online resource (38 pages)
Notes:	Source: Dissertations Abstracts International, Volume: 84-02, Section: B.
Contained By:	Dissertations Abstracts International84-02B.
Subject:	Cellulose acetate. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=29229199click for full text (PQDT)
ISBN:	9798841531685

Interactions Between Water and Cellulose Esters : = The Effect of the Acyl Side-chain Length.
Nilsson, Robin.

Interactions Between Water and Cellulose Esters :The Effect of the Acyl Side-chain Length. - 1 online resource (38 pages)

Source: Dissertations Abstracts International, Volume: 84-02, Section: B.

Thesis (M.Phil.)--Chalmers Tekniska Hogskola (Sweden), 2022.

Includes bibliographical references

Biopolymers, which are produced from natural sources, are gaining interest as a potential replacement for fossil-based polymers. As such, they are already widely used in several industries, including the food, healthcare, and personal care industries. To harness the full potential of biopolymers as materials in new products designed for specific tasks, an ability to accurately predict their properties and how these properties change in different environments, is desirable. Hansen Solubility Parameters (HSP) combine dispersive, polar, and hydrogen bonding energies to understand interactions between molecules. This thesis explores the potential use of HSP as predictors of glass transition temperatures (Tg) and water interactions. It also focuses on elucidating the effect of an increased side-chain length of cellulose esters on their thermal properties, structural properties, and water interactions, together with how these properties are affected by the absorption of water. The cellulose esters studied here were cellulose acetate, cellulose acetate propionate, and cellulose acetate butyrate.The HSP showed that the dispersive energy dominates the total cohesive energy, followed by the hydrogen bonding and then the polar energy. Counter-intuitively, the Tg decreased with an increased total cohesive energy. The HSP explained this phenomenon, namely, that the increased length of the substituents screened the short-range hydrogen bonds. A similar effect was observed for water solubility and penetration into the cellulose esters, which decreased with increasing side-chain lengths despite the approximately constant hydrogen bonding energies. This indicates the importance of focusing on each of the different interaction parameters instead of only the total HSP.

Electronic reproduction.
Ann Arbor, Mich. :
ProQuest,
2023

Mode of access: World Wide Web

ISBN: 9798841531685Subjects--Topical Terms:

3695528
Cellulose acetate.
Index Terms--Genre/Form:

542853
Electronic books.

Interactions Between Water and Cellulose Esters : = The Effect of the Acyl Side-chain Length.
LDR:03167nmm a2200409K 4500 001 2357903
005 20230725053809.5
006 m o d
007 cr mn ---uuuuu
008 241011s2022 xx obm 000 0 eng d
020 $a 9798841531685
035 $a (MiAaPQ)AAI29229199
035 $a (MiAaPQ)Chalmers_SE529320
035 $a AAI29229199
040 $a MiAaPQ $b eng $c MiAaPQ $d NTU
100 1 $a Nilsson, Robin. $3 3698431
245 1 0 $a Interactions Between Water and Cellulose Esters : $b The Effect of the Acyl Side-chain Length.
264 0 $c 2022
300 $a 1 online resource (38 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: Dissertations Abstracts International, Volume: 84-02, Section: B.
500 $a Advisor: Larsson, Anette.
502 $a Thesis (M.Phil.)--Chalmers Tekniska Hogskola (Sweden), 2022.
504 $a Includes bibliographical references
520 $a Biopolymers, which are produced from natural sources, are gaining interest as a potential replacement for fossil-based polymers. As such, they are already widely used in several industries, including the food, healthcare, and personal care industries. To harness the full potential of biopolymers as materials in new products designed for specific tasks, an ability to accurately predict their properties and how these properties change in different environments, is desirable. Hansen Solubility Parameters (HSP) combine dispersive, polar, and hydrogen bonding energies to understand interactions between molecules. This thesis explores the potential use of HSP as predictors of glass transition temperatures (Tg) and water interactions. It also focuses on elucidating the effect of an increased side-chain length of cellulose esters on their thermal properties, structural properties, and water interactions, together with how these properties are affected by the absorption of water. The cellulose esters studied here were cellulose acetate, cellulose acetate propionate, and cellulose acetate butyrate.The HSP showed that the dispersive energy dominates the total cohesive energy, followed by the hydrogen bonding and then the polar energy. Counter-intuitively, the Tg decreased with an increased total cohesive energy. The HSP explained this phenomenon, namely, that the increased length of the substituents screened the short-range hydrogen bonds. A similar effect was observed for water solubility and penetration into the cellulose esters, which decreased with increasing side-chain lengths despite the approximately constant hydrogen bonding energies. This indicates the importance of focusing on each of the different interaction parameters instead of only the total HSP.
533 $a Electronic reproduction. $b Ann Arbor, Mich. : $c ProQuest, $d 2023
538 $a Mode of access: World Wide Web
650 4 $a Cellulose acetate. $3 3695528
650 4 $a Software. $2 gtt. $3 619355
650 4 $a Humidity. $3 3559498
650 4 $a Food. $3 551593
650 4 $a Hydrogen. $3 580023
650 4 $a Polymer films. $3 3683829
650 4 $a Energy. $3 876794
650 4 $a Packaging. $3 585030
650 4 $a Membranes. $3 1531702
650 4 $a Polymers. $3 535398
650 4 $a Polyethylene. $3 2014375
650 4 $a Biopolymers. $3 622162
650 4 $a Plastics. $3 649803
650 4 $a Pharmaceutical sciences. $3 3173021
650 4 $a Permeability. $3 915594
650 4 $a Temperature. $3 711968
650 4 $a Solvents. $3 620946
650 4 $a Retention. $3 2137396
650 4 $a Molecular weight. $3 3683783
650 4 $a Molecular structure. $3 592675
650 4 $a Experimental methods. $3 3698432
650 4 $a Atmospheric sciences. $3 3168354
650 4 $a Computer science. $3 523869
650 4 $a Medicine. $3 641104
650 4 $a Polymer chemistry. $3 3173488
655 7 $a Electronic books. $2 lcsh $3 542853
690 $a 0572
690 $a 0791
690 $a 0549
690 $a 0795
690 $a 0725
690 $a 0984
690 $a 0564
690 $a 0495
710 2 $a ProQuest Information and Learning Co. $3 783688
710 2 $a Chalmers Tekniska Hogskola (Sweden). $3 1913472
773 0 $t Dissertations Abstracts International $g 84-02B.
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=29229199 $z click for full text (PQDT)