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

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Interactions Between Water and Cellulose Esters :/
其他題名:	The Effect of the Acyl Side-chain Length.
作者:	Nilsson, Robin.
面頁冊數:	1 online resource (38 pages)
附註:	Source: Dissertations Abstracts International, Volume: 84-02, Section: B.
Contained By:	Dissertations Abstracts International84-02B.
標題:	Cellulose acetate. -
電子資源:	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.
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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
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650 4 $a Permeability. $3 915594
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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
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