The chitosan hydrogels: from structure to function

2018 ◽  
Vol 42 (21) ◽  
pp. 17162-17180 ◽  
Author(s):  
Jing Fu ◽  
Fuchao Yang ◽  
Zhiguang Guo
Keyword(s):  
Mechanical Strength ◽  
Structural Characteristics ◽  
Strength Properties ◽  
Self Healing ◽  
Chemical Bonds ◽  
Stimuli Responsive ◽  
High Mechanical Strength ◽  
Chitosan Hydrogels ◽  
Physical And Chemical ◽  
The Relationship

This review places an emphasis on chitosan intelligent hydrogels. The fabrication methods and mechanisms are introduced in this review and the interactions of the formation of hydrogels with both physical and chemical bonds are also introduced. The relationship between the structural characteristics and the corresponding functions of stimuli-responsive characteristics, self-healing functions and high mechanical strength properties of the chitosan hydrogels are discussed in detail.

scholarly journals The Influence of Structure of Multilayer Woven Fabrics on Their Mechanical Properties

Materials ◽  
2021 ◽  
Vol 14 (5) ◽  
pp. 1315
Author(s):  
Ewa Witczak ◽  
Izabela Jasińska ◽  
Iwona Krawczyńska
Keyword(s):  
Mechanical Strength ◽  
Structural Characteristics ◽  
Structural Models ◽  
Strength Properties ◽  
Woven Fabrics ◽  
Breaking Force ◽  
Bending Rigidity ◽  
High Mechanical Strength ◽  
Conveyor Belts ◽  
Cyclic Tensile Test

Multilayer woven fabrics used for conveyor belts must be characterized by high mechanical strength. The design process of multilayer woven fabrics for such application requires taking into account the structural characteristics of the fabric, which allows to adjust the final product properties to the dedicated use. The geometry of warp threads—means stuffer and binding is the decisive aspect, which influences the strength properties of multilayer woven fabrics and materials made with their use as well. The aim of this work was to examine the possibility of shaping mechanical strength and bending rigidity of multilayer woven fabrics by changing the order of introducing weft threads into individual layers. The eight variants of multilayer woven fabrics were manufactured using laboratory harness loom. They were produced using different structural models in two weft variants, then tested. The mechanical features were determined, such as breaking force, recovered and unrecovered elongations in cyclic tensile test, stiffness rigidity. The analysis of the obtained results confirmed, that both the model and the order in which the weft threads were introduced into individual layers influence the mechanical strength and bending rigidity of multilayer woven. It was found, that the strength properties characterized by the above mentioned indicators are influenced by the number of threads weaved as both the stuffer and binding warp.

scholarly journals Dynamic Nanohybrid-Polysaccharide Hydrogels for Soft Wearable Strain Sensing

Sensors ◽  
2021 ◽  
Vol 21 (11) ◽  
pp. 3574
Author(s):  
Pejman Heidarian ◽  
Hossein Yousefi ◽  
Akif Kaynak ◽  
Mariana Paulino ◽  
Saleh Gharaie ◽  
...  
Keyword(s):  
Mechanical Strength ◽  
Strain Sensors ◽  
Self Healing ◽  
Nano Materials ◽  
Strain Sensing ◽  
Ferric Ions ◽  
Research Activity ◽  
Adhesion Properties ◽  
High Mechanical Strength ◽  
The Moment

Electroconductive hydrogels with stimuli-free self-healing and self-recovery (SELF) properties and high mechanical strength for wearable strain sensors is an area of intensive research activity at the moment. Most electroconductive hydrogels, however, consist of static bonds for mechanical strength and dynamic bonds for SELF performance, presenting a challenge to improve both properties into one single hydrogel. An alternative strategy to successfully incorporate both properties into one system is via the use of stiff or rigid, yet dynamic nano-materials. In this work, a nano-hybrid modifier derived from nano-chitin coated with ferric ions and tannic acid (TA/Fe@ChNFs) is blended into a starch/polyvinyl alcohol/polyacrylic acid (St/PVA/PAA) hydrogel. It is hypothesized that the TA/Fe@ChNFs nanohybrid imparts both mechanical strength and stimuli-free SELF properties to the hydrogel via dynamic catecholato-metal coordination bonds. Additionally, the catechol groups of TA provide mussel-inspired adhesion properties to the hydrogel. Due to its electroconductivity, toughness, stimuli-free SELF properties, and self-adhesiveness, a prototype soft wearable strain sensor is created using this hydrogel and subsequently tested.

A room-temperature self-healing elastomer with ultra-high strength and toughness fabricated via optimized hierarchical hydrogen-bonding interactions

2022 ◽  
Author(s):  
Liangliang Xia ◽  
Ming Zhou ◽  
Hongjun Tu ◽  
wen Zeng ◽  
xiaoling Yang ◽  
...  
Keyword(s):  
Hydrogen Bonding ◽  
Mechanical Strength ◽  
Room Temperature ◽  
Polymeric Materials ◽  
High Strength ◽  
Self Healing ◽  
High Mechanical Strength ◽  
Hydrogen Bonding Interactions ◽  
Healing Efficiency ◽  
Good Healing

The preparation of room-temperature self-healing polymeric materials with good healing efficiency and high mechanical strength is challenging. Two processes are essential to realise the room-temperature self-healing of materials: (a) a...

Self-healable gradient copolymers

2019 ◽  
Vol 3 (3) ◽  
pp. 464-471 ◽  
Author(s):  
Jing Cui ◽  
Zhe Ma ◽  
Li Pan ◽  
Chun-Hua An ◽  
Jing Liu ◽  
...  
Keyword(s):  
Mechanical Strength ◽  
Ionic Interactions ◽  
Self Healing ◽  
Gradient Copolymers ◽  
High Mechanical Strength ◽  
Gradient Distribution

Synergistic hard/soft gradient distribution and dynamic ionic interactions impart high mechanical strength, toughness, stretchability and tenacious self-healing ability to copolymers.

Morphology of Polyamideliquid Crystalline Polymer Blend

1990 ◽  
Vol 215 ◽  
Author(s):  
K. Nishii ◽  
M. Usui ◽  
T. Muraya ◽  
K. Kimura
Keyword(s):  
Mechanical Properties ◽  
Mechanical Strength ◽  
Polymer Blend ◽  
Liquid Crystalline Polymer ◽  
Liquid Crystalline ◽  
Crystalline Polymer ◽  
Polymer Structure ◽  
High Mechanical Strength ◽  
Blend Morphology ◽  
The Relationship

Polymer blend technology is attractive from the standpoint of both science and industry, and many combinations have been studied. Recently, the polymer blends, including liquid crystalline polymer, have been especially worthy of notice, [1,2,3]. In order to obtain materials with a high mechanical strength and moldability for use in thin molded items, we chose polyamide (PA)-liquid crystalline polymer (LCP) blends. In this study, we first measured the mechanical properties, then studied the features of the polymer structure. We also examined the relationship between morphology and mechanical properties. As a result, we found that the mechanical properties of the blends depended largely on blend morphology, and that mechanical strength increased as blend compatibility increased. On the other hand, we also found that the blends showed compatible and microheterogeneous dispersion at less than 25 wt% LCP, while at more than 30 wt% LCP, blends tended to show twophase separation.

Melt-Processable Shape-Memory Hydrogels with Self-Healing Ability of High Mechanical Strength

2016 ◽  
Vol 49 (19) ◽  
pp. 7442-7449 ◽  
Author(s):  
Cigdem Bilici ◽  
Volkan Can ◽  
Ulrich Nöchel ◽  
Marc Behl ◽  
Andreas Lendlein ◽  
...  
Keyword(s):  
Mechanical Strength ◽  
Shape Memory ◽  
Self Healing ◽  
High Mechanical Strength

Structural Characteristics of Double Network Gels with Extremely High Mechanical Strength

2004 ◽  
Vol 37 (14) ◽  
pp. 5370-5374 ◽  
Author(s):  
Yang-Ho Na ◽  
Takayuki Kurokawa ◽  
Yoshinori Katsuyama ◽  
Hiroyuki Tsukeshiba ◽  
Jian Ping Gong ◽  
...  
Keyword(s):  
Mechanical Strength ◽  
Structural Characteristics ◽  
High Mechanical Strength ◽  
Double Network

Polyelectrolyte complex-based self-healing, fatigue-resistant and anti-freezing hydrogels as highly sensitive ionic skins

2020 ◽  
Vol 8 (7) ◽  
pp. 3667-3675 ◽  
Author(s):  
Siheng Li ◽  
Hongyu Pan ◽  
Yuting Wang ◽  
Junqi Sun
Keyword(s):  
Mechanical Strength ◽  
Polyelectrolyte Complex ◽  
Mechanical Damage ◽  
High Sensitivity ◽  
Self Healing ◽  
High Mechanical Strength ◽  
Highly Sensitive ◽  
Sensing Performance

Hydrogel-based self-healing ionic skins possess high mechanical strength, excellent resilience, anti-freezing properties and high sensitivity and can heal fatigue and mechanical damage to restore the original sensing performance.

scholarly journals A Rapidly Self-Healing Host-Guest Supramolecular Hydrogel with High Mechanical Strength and Excellent Biocompatibility

2018 ◽  
Vol 57 (29) ◽  
pp. 9008-9012 ◽  
Author(s):  
Zhifang Wang ◽  
Yipeng Ren ◽  
Ye Zhu ◽  
Lijing Hao ◽  
Yunhua Chen ◽  
...  
Keyword(s):  
Mechanical Strength ◽  
Self Healing ◽  
Supramolecular Hydrogel ◽  
High Mechanical Strength
Sign in / Sign up

Export Citation Format

Share Document