國立虎尾科技大學 |

Simple Strategy for Production Of Single-Component and Tunable Cellulose-Based Hydrogels and Their Potential Applications.

紀錄類型:	書目-語言資料,印刷品 : Monograph/item
正題名/作者:	Simple Strategy for Production Of Single-Component and Tunable Cellulose-Based Hydrogels and Their Potential Applications./
作者:	Park, Seonghyun.
出版者:	Ann Arbor : ProQuest Dissertations & Theses, : 2023,
面頁冊數:	214 p.
附註:	Source: Dissertations Abstracts International, Volume: 85-05, Section: B.
Contained By:	Dissertations Abstracts International85-05B.
標題:	Cellulose acetate. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=30673693
ISBN:	9798380713474

Simple Strategy for Production Of Single-Component and Tunable Cellulose-Based Hydrogels and Their Potential Applications.
Park, Seonghyun.

Simple Strategy for Production Of Single-Component and Tunable Cellulose-Based Hydrogels and Their Potential Applications. - Ann Arbor : ProQuest Dissertations & Theses, 2023 - 214 p.

Source: Dissertations Abstracts International, Volume: 85-05, Section: B.

Thesis (Ph.D.)--North Carolina State University, 2023.

This item must not be sold to any third party vendors.

As global concern for environmental issues continues to rise, there is a growing demand for sustainable materials. This has led to an increase in research on naturally occurring polymers, which offer a range of benefits including low carbon footprint, biocompatibility, and biodegradability. Among these polymers, cellulose has gained significant attention due to its availability and ease of access. One area of research that shows promise involves the development of hydrogels derived from cellulose. Hydrogels are versatile materials that have found applications in various fields such as cosmetics, hygiene products, drug delivery, and biomedical research. While both natural and synthetic polymers can be used to create hydrogels, natural polymers offer several advantages. However, the production of natural polymer-based hydrogels presents technical challenges that hinder their industrial-scale usage, leading to a greater reliance on synthetic polymer-based hydrogels. To increase the use of natural polymer-based hydrogels, it is necessary to develop simpler and more efficient techniques for their production. This study aims to address this need by proposing a simple strategy for the production of hydrogels based on cellulose and exploring their potential applications.Chapter 1 lays the foundation for subsequent chapters (Chapters 1-3) investigating singlecomponent hydrogels based on cellulose. These hydrogels can be formed by utilizing the selfassembly properties of amphiphilic copolymers in water. Amphiphilic cellulose derivatives, specifically, cellulose acetate sulfate (CAS), which can form hydrogels when the balance between sulfate and acetyl moieties is optimal. Single-component hydrogels based on CAS can be formed by adding only deionized water, without crosslinking agents or other polymers. In the following chapters, the potential applications of CAS hydrogels are explored. Chapter 1 assesses the feasibility of CAS hydrogels as drug release matrices. Hydrophilic drugs were integrated into CAS hydrogel matrices, and the release of the drugs was controlled by the balance between sulfate and acetyl moieties in the hydrogels. Chapter 2 investigates the use of CAS hydrogels as adsorbents for treating aqueous contaminants. The negatively charged functional groups in CAS hydrogels, such as hydroxyl and sulfate moieties, allow them to interact with cationic contaminants and remove them effectively. Chapter 3 studies the application of CAS hydrogels as films and coatings for food packaging. The physicochemical properties of CAS films depend on the balance between sulfate and acetyl moieties, but regardless of the balance, all CAS coatings are effective in prolonging the shelf life of bananas.The production of cellulose acetate (CA), a widely used cellulose derivative, has been challenged by the formation of insoluble gel particles (IGP) that deteriorate the quality of the product and hinder the production process. These IGPs are mainly composed of xylan acetate (XA) and CA, but their formation mechanism is not yet fully understood despite extensive research. Therefore, Therefore, Chapter 4 and 5 are devoted to exploring IGP formation during CA production. Chapter 4 delves into the formation of IGP during CA production by studying the impact of XA and process conditions through simulation of industrial CA production. It is unveiled that the formation of IGP during the production of CA is linked to intermolecular interactions between CA and XA induced by the precipitation process. Furthermore, the essential characteristics of XA that lead to IGP formation have been investigated. In Chapter 5, a newly discovered impurity in dissolving pulps, sulfuric acid insoluble substances (SIS), which have an adverse impact on the quality of cellulose acetate, is investigated. To comprehend the origin and impact of SIS, fiber fractionation and hydrolysis techniques are utilized. The formation of insoluble gel particles (IGP) during industrial cellulose acetate production is explored by simulating the CA synthesis and precipitation processes, investigating the roles of SIS.

ISBN: 9798380713474Subjects--Topical Terms:

1437784
Cellulose acetate.

Simple Strategy for Production Of Single-Component and Tunable Cellulose-Based Hydrogels and Their Potential Applications.
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300 $a 214 p.
500 $a Source: Dissertations Abstracts International, Volume: 85-05, Section: B.
500 $a Advisor: Pasquinelli, Melissa A.;Shirwaiker, Rohan A.;Treasure, Trevor;Kelley, Stephen S.;Park, Sunkyu.
502 $a Thesis (Ph.D.)--North Carolina State University, 2023.
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520 $a As global concern for environmental issues continues to rise, there is a growing demand for sustainable materials. This has led to an increase in research on naturally occurring polymers, which offer a range of benefits including low carbon footprint, biocompatibility, and biodegradability. Among these polymers, cellulose has gained significant attention due to its availability and ease of access. One area of research that shows promise involves the development of hydrogels derived from cellulose. Hydrogels are versatile materials that have found applications in various fields such as cosmetics, hygiene products, drug delivery, and biomedical research. While both natural and synthetic polymers can be used to create hydrogels, natural polymers offer several advantages. However, the production of natural polymer-based hydrogels presents technical challenges that hinder their industrial-scale usage, leading to a greater reliance on synthetic polymer-based hydrogels. To increase the use of natural polymer-based hydrogels, it is necessary to develop simpler and more efficient techniques for their production. This study aims to address this need by proposing a simple strategy for the production of hydrogels based on cellulose and exploring their potential applications.Chapter 1 lays the foundation for subsequent chapters (Chapters 1-3) investigating singlecomponent hydrogels based on cellulose. These hydrogels can be formed by utilizing the selfassembly properties of amphiphilic copolymers in water. Amphiphilic cellulose derivatives, specifically, cellulose acetate sulfate (CAS), which can form hydrogels when the balance between sulfate and acetyl moieties is optimal. Single-component hydrogels based on CAS can be formed by adding only deionized water, without crosslinking agents or other polymers. In the following chapters, the potential applications of CAS hydrogels are explored. Chapter 1 assesses the feasibility of CAS hydrogels as drug release matrices. Hydrophilic drugs were integrated into CAS hydrogel matrices, and the release of the drugs was controlled by the balance between sulfate and acetyl moieties in the hydrogels. Chapter 2 investigates the use of CAS hydrogels as adsorbents for treating aqueous contaminants. The negatively charged functional groups in CAS hydrogels, such as hydroxyl and sulfate moieties, allow them to interact with cationic contaminants and remove them effectively. Chapter 3 studies the application of CAS hydrogels as films and coatings for food packaging. The physicochemical properties of CAS films depend on the balance between sulfate and acetyl moieties, but regardless of the balance, all CAS coatings are effective in prolonging the shelf life of bananas.The production of cellulose acetate (CA), a widely used cellulose derivative, has been challenged by the formation of insoluble gel particles (IGP) that deteriorate the quality of the product and hinder the production process. These IGPs are mainly composed of xylan acetate (XA) and CA, but their formation mechanism is not yet fully understood despite extensive research. Therefore, Therefore, Chapter 4 and 5 are devoted to exploring IGP formation during CA production. Chapter 4 delves into the formation of IGP during CA production by studying the impact of XA and process conditions through simulation of industrial CA production. It is unveiled that the formation of IGP during the production of CA is linked to intermolecular interactions between CA and XA induced by the precipitation process. Furthermore, the essential characteristics of XA that lead to IGP formation have been investigated. In Chapter 5, a newly discovered impurity in dissolving pulps, sulfuric acid insoluble substances (SIS), which have an adverse impact on the quality of cellulose acetate, is investigated. To comprehend the origin and impact of SIS, fiber fractionation and hydrolysis techniques are utilized. The formation of insoluble gel particles (IGP) during industrial cellulose acetate production is explored by simulating the CA synthesis and precipitation processes, investigating the roles of SIS.
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