Anisotropic Structure and Properties of Chitin and Chitosan Nanofibril-Supported Starch Foams

2020 ◽  
Vol 8 (47) ◽  
pp. 17387-17396
Author(s):  
Jiaqi Shan ◽  
Dagang Liu ◽  
Fan Su ◽  
Minyu Li ◽  
Huafeng Tian ◽  
...  
Keyword(s):  
Anisotropic Structure ◽  
Structure And Properties ◽  
Starch Foams ◽  
Chitin And Chitosan

Biodegradable blends based on chitin and chitosan: Production, structure, and properties

2011 ◽  
Vol 121 (3) ◽  
pp. 1850-1859 ◽  
Author(s):  
Svetlana Z. Rogovina ◽  
Christine V. Alexanyan ◽  
Eduard V. Prut
Keyword(s):  
Production Structure ◽  
Structure And Properties ◽  
Chitin And Chitosan ◽  
Biodegradable Blends

scholarly journals Chitosan Derivatives: Introducing New Functionalities with a Controlled Molecular Architecture for Innovative Materials †

2018 ◽  
Author(s):  
Waldo M. Argüelles-Monal ◽  
Jaime Lizardi-Mendoza ◽  
Daniel Fernández-Quiroz ◽  
Maricarmen T. Recillas-Mota ◽  
Marcelino Montiel-Herrera
Keyword(s):  
Chemical Structure ◽  
Molecular Architecture ◽  
Structure And Properties ◽  
New Materials ◽  
Important Condition ◽  
Experimental Conditions ◽  
Innovative Materials ◽  
Chitin And Chitosan ◽  
Macromolecular Architecture ◽  
Advanced Applications

The functionalization of polymeric substances is of great interest for the development of innovative materials for advanced applications. For many decades, the functionalization of chitosan has been a convenient way to improve its properties with the aim to prepare new materials with specialized characteristics. In the present article, we summarize the latest methods for the modification and derivatization of chitin and chitosan, trying to introduce specific functional groups under experimental conditions, which allow a control over the macromolecular architecture. This is motivated because an understanding of the interdependence between chemical structure and properties is an important condition for proposing innovative materials. New advances in methods and strategies of functionalization such as click chemistry approach, grafting onto copolymerization, coupling with cyclodextrins and reactions in ionic liquids are discussed.

Dissolution of natural polymers in ionic liquids: A review

e-Polymers ◽  
2012 ◽  
Vol 12 (1) ◽  
Author(s):  
Zhuojun Meng ◽  
Xuejing Zheng ◽  
Keyong Tang ◽  
Jie Liu ◽  
Shufa Qin
Keyword(s):  
Ionic Liquids ◽  
High Strength ◽  
Polymer Materials ◽  
Structure And Properties ◽  
Natural Polymer ◽  
Natural Polymers ◽  
Keratin Fibers ◽  
Strength And Stiffness ◽  
Living Organisms ◽  
Chitin And Chitosan

AbstractNatural polymers are produced by living organisms, e.g. plants, animals, microorganisms. Natural polymer materials have gained increasing attention due to their high strength and stiffness combined with carbon neutral, biocompatibility, biodegradability, renewability and sustainability. However, due to the strong interand intra-molecular hydrogen bonds, many natural polymers are extremely difficult to be dissolved in water or traditional organic solvents. The processing difficulties tremendously limit the applications of natural polymers in many fields. Recently, using ionic liquids (ILs) as novel solvents to dissolve natural polymers has attracted increasing attention. ILs has been shown to be highly effective at dissolving some natural polymers to technically useful concentrations. In this article, the structure and basic properties of ILs are introduced; the recent progress is reviewed in the dissolution of several important natural polymers using ionic liquids, including cellulose, chitin and chitosan, wool keratin fibers, silk fibroin and collagen fibers. The dissolution mechanisms of natural polymers using ILs as solvents are analyzed. The structure and properties of native and regenerated natural polymers are discussed in details.

Organo-soluble segmented rigid-rod polyimide films. Part 4.—Anisotropic structure and properties

1993 ◽  
Vol 3 (4) ◽  
pp. 353-360 ◽  
Author(s):  
Fred E. Arnold ◽  
Dexing Shen ◽  
Chul Joo Lee ◽  
Frank W. Harris ◽  
Stephen Z. D. Cheng ◽  
...  
Keyword(s):  
Anisotropic Structure ◽  
Structure And Properties ◽  
Polyimide Films ◽  
Rigid Rod

Graphene Aerogel/Epoxy Composites with Exceptional Anisotropic Structure and Properties

2015 ◽  
Vol 7 (9) ◽  
pp. 5538-5549 ◽  
Author(s):  
Zhenyu Wang ◽  
Xi Shen ◽  
Mohammad Akbari Garakani ◽  
Xiuyi Lin ◽  
Ying Wu ◽  
...  
Keyword(s):  
Epoxy Composites ◽  
Anisotropic Structure ◽  
Structure And Properties ◽  
Graphene Aerogel

Flavor-Related Applications of Chitin and Chitosan in Foods: Effect of Structure and Properties on the Efficacy

2021 ◽  
pp. 169-202
Author(s):  
Shang-Ta Wang ◽  
Cheng-Che Tsai ◽  
Ming-Chih Shih ◽  
Min-Lang Tsai
Keyword(s):  
Structure And Properties ◽  
Chitin And Chitosan ◽  
Effect Of Structure

Structure of second phases in TiAl alloys containing Cr and B

1991 ◽  
Vol 49 ◽  
pp. 576-577
Author(s):  
Ernest L. Hall ◽  
Shyh-Chin Huang
Keyword(s):  
Grain Size ◽  
Second Phase ◽  
Structure And Properties ◽  
Tial Alloys ◽  
Second Phases ◽  
Interstitial Elements

Addition of interstitial elements to γ-TiAl alloys is currently being explored as a method for improving the properties of these alloys. Previous work in which a number of interstitial elements were studied showed that boron was particularly effective in refining the grain size in castings, and led to enhanced strength while maintaining reasonable ductility. Other investigators have shown that B in γ-TiAl alloys tends to promote the formation of TiB2 as a second phase. In this study, the microstructure of Bcontaining TiAl alloys was examined in detail in order to describe the mechanism by which B alters the structure and properties of these alloys.

Relationships between hierarchical structure and properties in macromolecular systems

1987 ◽  
Vol 45 ◽  
pp. 440-443
Author(s):  
E. Baer
Keyword(s):  
Uniaxial Tension ◽  
Hierarchical Structure ◽  
Inorganic Material ◽  
Hierarchical Structures ◽  
Bone Collagen ◽  
Structure And Properties ◽  
Connective Tissues ◽  
Scale Level ◽  
Fibrous Protein ◽  
Macromolecular Systems

The most advanced macromolecular materials are found in plants and animals, and certainly the connective tissues in mammals are amongst the most advanced macromolecular composites known to mankind. The efficient use of collagen, a fibrous protein, in the design of both soft and hard connective tissues is worthy of comment. Very crudely, in bone collagen serves as a highly efficient binder for the inorganic hydroxyappatite which stiffens the structure. The interactions between the organic fiber of collagen and the inorganic material seem to occur at the nano (scale) level of organization. Epitatic crystallization of the inorganic phase on the fibers has been reported to give a highly anisotropic, stress responsive, structure. Soft connective tissues also have sophisticated oriented hierarchical structures. The collagen fibers are “glued” together by a highly hydrated gel-like proteoglycan matrix. One of the simplest structures of this type is tendon which functions primarily in uniaxial tension as a reinforced elastomeric cable between muscle and bone.

The Structure and Properties of MoSi2 Thin Film in Mos Process

1980 ◽  
Vol 38 ◽  
pp. 326-327
Author(s):  
C.K. Wu ◽  
P. Chang ◽  
N. Godinho
Keyword(s):  
Thin Film ◽  
Integrated Circuits ◽  
High Performance ◽  
Large Scale ◽  
Process Development ◽  
Structure And Properties ◽  
Metal Silicides ◽  
High Oxidation ◽  
Important Approach ◽  
High Oxidation Resistance

Recently, the use of refractory metal silicides as low resistivity, high temperature and high oxidation resistance gate materials in large scale integrated circuits (LSI) has become an important approach in advanced MOS process development (1). This research is a systematic study on the structure and properties of molybdenum silicide thin film and its applicability to high performance LSI fabrication.

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