Developing visible-light-induced dynamic aromatic Schiff base bonds for room-temperature self-healable and reprocessable waterborne polyurethanes with high mechanical properties

2020 ◽  
Vol 8 (14) ◽  
pp. 6757-6767 ◽  
Author(s):  
Wuhou Fan ◽  
Yong Jin ◽  
Liangjie Shi ◽  
Rong Zhou ◽  
Weining Du
Keyword(s):  
Mechanical Properties ◽  
Schiff Base ◽  
Tensile Stress ◽  
Visible Light ◽  
Room Temperature ◽  
Waterborne Polyurethanes

Visible-light-induced dynamic aromatic Schiff base bond was developed for waterborne polyurethanes, which possess a desirable room-temperature self-healability and excellent mechanical properties (tensile stress: 14.32 MPa; toughness: 64.80 MJ m−3).

Room‐temperature self‐healing and reprocessing of Diselenide‐containing waterborne polyurethanes under visible light

2018 ◽  
Vol 136 (7) ◽  
pp. 47071 ◽  
Author(s):  
Wuhou Fan ◽  
Yong Jin ◽  
Yuhua Huang ◽  
Jiezhou Pan ◽  
Weining Du ◽  
...  
Keyword(s):  
Visible Light ◽  
Room Temperature ◽  
Self Healing ◽  
Waterborne Polyurethanes

scholarly journals Biocompatible Diselenide-Containing Protein Hydrogels with Effective Visible-Light-Initiated Self-Healing Properties

Polymers ◽  
2021 ◽  
Vol 13 (24) ◽  
pp. 4360
Author(s):  
Shengda Liu ◽  
Shengchao Deng ◽  
Tengfei Yan ◽  
Xin Zhang ◽  
Ruizhen Tian ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Schiff Base ◽  
Visible Light ◽  
Enzymatic Catalysis ◽  
Mechanical Damage ◽  
Covalent Bond ◽  
Light Response ◽  
Soft Materials ◽  
Self Healing ◽  
Protein Hydrogels

Smart hydrogels are typical functional soft materials, but their functional and mechanical properties are compromised upon micro- or macro-mechanical damage. In contrast, hydrogels with self-healing properties overcome this limitation. Herein, a dual dynamic bind, cross-linked, self-healing protein hydrogel is prepared, based on Schiff base bonds and diselenide bonds. The Schiff base bond is a typical dynamic covalent bond and the diselenide bond is an emerging dynamic covalent bond with a visible light response, which gives the resulting hydrogel a dual response in visible light and a desirable self-healing ability. The diselenide-containing protein hydrogels were biocompatible due to the fact that their main component was protein. In addition, the hydrogels loaded with glucose oxidase (GOx) could be transformed into sols in glucose solution due to the sensitive response of the diselenide bonds to the generated hydrogen peroxide (H2O2) by enzymatic catalysis. This work demonstrated a diselenide-containing protein hydrogel that could efficiently self-heal up to nearly 100% without compromising their mechanical properties under visible light at room temperature.

scholarly journals Microstructures and High-Temperature Properties of Sm-Modified Mg-4Al-4RE Alloy

Metals ◽  
2022 ◽  
Vol 12 (1) ◽  
pp. 135
Author(s):  
Hongkui Mao ◽  
Xiaoyu Bai ◽  
Yu Wang ◽  
Hong Xu ◽  
Jibo Hou ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
High Temperature ◽  
Elevated Temperature ◽  
Tensile Stress ◽  
Tensile Properties ◽  
Yield Stress ◽  
Room Temperature ◽  
Volume Fraction ◽  
Ultimate Tensile Stress ◽  
New Phase

The effect of Sm on the microstructure and tensile properties of Mg-4Al-4 (La, Ce) alloy was studied. The Mg-4Al-4 (La, Ce) alloy was mainly composed of α-Mg and Al11(La, Ce)3. With the addition of Sm, a new phase of Al2(La, Ce, Sm) was revealed in the alloy. The results showed that at room temperature (RT), after Sm addition, the ultimate tensile stress and the elongation decreased, while the yield stress increased slightly; the elongation increased with the Sm addition and the yield stress was basically the same, but the ultimate tensile stress decreased at an elevated temperature of 150 °C. The change in the mechanical properties of the alloy was mainly related to the change in microstructure and phase. With the increase in Sm content, the volume fraction of Al2(La, Ce, Sm) phase increased and the Al11(La, Ce)3 eutectic volume fraction decreased significantly, which led to a change in the mechanical properties of the alloy. The 1 wt.%Sm-addition alloy exhibited greater elongation than the Sm-free alloys.

Mechanical Properties and Dislocation Structure of Single Crystal Cdte Deformed in Compression at 300°C

1976 ◽  
Vol 34 ◽  
pp. 592-593
Author(s):  
Ernest L. Hall ◽  
J. B. Vander Sande
Keyword(s):  
Mechanical Properties ◽  
Single Crystal ◽  
Dislocation Structure ◽  
Room Temperature ◽  
Elevated Temperatures ◽  
Strain Curve ◽  
Optical Devices ◽  
Semiconductor Compound ◽  
Wide Range ◽  
Sample Orientation

The present paper describes research on the mechanical properties and related dislocation structure of CdTe, a II-VI semiconductor compound with a wide range of uses in electrical and optical devices. At room temperature CdTe exhibits little plasticity and at the same time relatively low strength and hardness. The mechanical behavior of CdTe was examined at elevated temperatures with the goal of understanding plastic flow in this material and eventually improving the room temperature properties. Several samples of single crystal CdTe of identical size and crystallographic orientation were deformed in compression at 300°C to various levels of total strain. A resolved shear stress vs. compressive glide strain curve (Figure la) was derived from the results of the tests and the knowledge of the sample orientation.

Autonomous self-healing polyisoprene elastomers with high modulus and good toughness based on the synergy of dynamic ionic crosslinks and highly disordered crystals

2020 ◽  
Vol 11 (41) ◽  
pp. 6549-6558
Author(s):  
Yohei Miwa ◽  
Mayu Yamada ◽  
Yu Shinke ◽  
Shoichi Kutsumizu
Keyword(s):  
Mechanical Properties ◽  
Room Temperature ◽  
Self Healing ◽  
High Modulus ◽  
Disordered Crystals ◽  
Ionic Crosslinks

We designed a novel polyisoprene elastomer with high mechanical properties and autonomous self-healing capability at room temperature facilitated by the coexistence of dynamic ionic crosslinks and crystalline components that slowly reassembled.

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