Synthesis of self‐healing supramolecular waterborne polyurethane with quadruple hydrogen bonds via ureidotriazine

2021 ◽  
pp. 51932
Author(s):  
Hao Liu ◽  
Dongcheng Sun
Keyword(s):  
Hydrogen Bonds ◽  
Waterborne Polyurethane ◽  
Self Healing

An Unparalleled H-bonding and Ion-bonding Crosslinked Waterborne Polyurethane with Super Toughness and Unprecedented Fracture Energy

2021 ◽  
Author(s):  
Yuan Yao ◽  
Bo Liu ◽  
Ziyang Xu ◽  
Jianhai Yang ◽  
Wenguang Liu
Keyword(s):  
Mechanical Properties ◽  
Fracture Energy ◽  
Waterborne Polyurethane ◽  
Self Healing ◽  
Polyurethane Elastomers

Self-healing polyurethane elastomers have been extensively studied; however, developing an eco-friendly self-healable waterborne polyurethane (WPU) with exceptional mechanical properties remains a great challenge. Herein, we report healable, and highly tough...

Self-healing, pH-sensitive and shape memory hydrogels based on acylhydrazone and hydrogen bonds

2021 ◽  
pp. 110838
Author(s):  
Liyuan Qiao ◽  
Chengde Liu ◽  
Cheng Liu ◽  
Lishuai Zong ◽  
Hongjian Gu ◽  
...  
Keyword(s):  
Hydrogen Bonds ◽  
Shape Memory ◽  
Ph Sensitive ◽  
Self Healing

scholarly journals Room-temperature autonomous self-healing glassy polymers with hyperbranched structure

2020 ◽  
Vol 117 (21) ◽  
pp. 11299-11305 ◽  
Author(s):  
Hao Wang ◽  
Hanchao Liu ◽  
Zhenxing Cao ◽  
Weihang Li ◽  
Xin Huang ◽  
...  
Keyword(s):  
Hydrogen Bonds ◽  
Room Temperature ◽  
Glassy State ◽  
Glassy Polymers ◽  
Self Healing ◽  
External Branch ◽  
Healing Efficiency ◽  
High Degree ◽  
External Stimuli ◽  
Hyperbranched Structure

Glassy polymers are extremely difficult to self-heal below their glass transition temperature (Tg) due to the frozen molecules. Here, we fabricate a series of randomly hyperbranched polymers (RHP) with high density of multiple hydrogen bonds, which showTgup to 49 °C and storage modulus up to 2.7 GPa. We reveal that the hyperbranched structure not only allows the external branch units and terminals of the molecules to have a high degree of mobility in the glassy state, but also leads to the coexistence of “free” and associated complementary moieties of hydrogen bonds. The free complementary moieties can exchange with the associated hydrogen bonds, enabling network reconfiguration in the glassy polymer. As a result, the RHP shows amazing instantaneous self-healing with recovered tensile strength up to 5.5 MPa within 1 min, and the self-healing efficiency increases with contacting time at room temperature without the intervention of external stimuli.

A supramolecular silicone dielectric elastomer with a high dielectric constant and fast and highly efficient self-healing under mild conditions

2020 ◽  
Vol 8 (44) ◽  
pp. 23330-23343
Author(s):  
Haibin Sun ◽  
Xueying Liu ◽  
Suting Liu ◽  
Bing Yu ◽  
Nanying Ning ◽  
...  
Keyword(s):  
Dielectric Constant ◽  
Hydrogen Bonds ◽  
High Dielectric Constant ◽  
Dielectric Elastomer ◽  
Supramolecular Network ◽  
Self Healing ◽  
Mild Conditions ◽  
Highly Efficient ◽  
Coordination Bonds ◽  
High Dielectric

A silicone dielectric elastomer with simultaneous high dielectric constant, fast and efficient self-healing ability at mild conditions was prepared by constructing supramolecular network assembled by coordination bonds and hydrogen bonds.

scholarly journals A Robust, Tough and Multifunctional Polyurethane/Tannic Acid Hydrogel Fabricated by Physical-Chemical Dual Crosslinking

Polymers ◽  
2020 ◽  
Vol 12 (1) ◽  
pp. 239 ◽  
Author(s):  
Jie Wen ◽  
Xiaopeng Zhang ◽  
Mingwang Pan ◽  
Jinfeng Yuan ◽  
Zhanyu Jia ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Polyethylene Glycol ◽  
Hydrogen Bonds ◽  
Tannic Acid ◽  
Hydroxyl Groups ◽  
Self Healing ◽  
Physical Chemical ◽  
Biomedical Field ◽  
Physical Crosslinking

Commonly synthetic polyethylene glycol polyurethane (PEG–PU) hydrogels possess poor mechanical properties, such as robustness and toughness, which limits their load-bearing application. Hence, it remains a challenge to prepare PEG–PU hydrogels with excellent mechanical properties. Herein, a novel double-crosslinked (DC) PEG–PU hydrogel was fabricated by combining chemical with physical crosslinking, where trimethylolpropane (TMP) was used as the first chemical crosslinker and polyphenol compound tannic acid (TA) was introduced into the single crosslinked PU network by simple immersion process. The second physical crosslinking was formed by numerous hydrogen bonds between urethane groups of PU and phenol hydroxyl groups in TA, which can endow PEG–PU hydrogel with good mechanical properties, self-recovery and a self-healing capability. The research results indicated that as little as a 30 mg·mL−1 TA solution enhanced the tensile strength and fracture energy of PEG–PU hydrogel from 0.27 to 2.2 MPa, 2.0 to 9.6 KJ·m−2, respectively. Moreover, the DC PEG–PU hydrogel possessed good adhesiveness to diverse substrates because of TA abundant catechol groups. This work shows a simple and versatile method to prepare a multifunctional DC single network PEG–PU hydrogel with excellent mechanical properties, and is expected to facilitate developments in the biomedical field.

A healable waterborne polyurethane synergistically cross-linked by hydrogen bonds and covalent bonds for composite conductors

2020 ◽  
Vol 8 (15) ◽  
pp. 5280-5292 ◽  
Author(s):  
Yan Yang ◽  
Zushan Ye ◽  
Xiaoxuan Liu ◽  
Jiahui Su
Keyword(s):  
Hydrogen Bonds ◽  
Waterborne Polyurethane ◽  
Double Bonds ◽  
Covalent Bonds ◽  
Waterborne Polyurethanes ◽  
Composite Conductors

Healable waterborne polyurethanes synergistically cross-linked by dynamic hydrogen bonds and photo-curable double bonds for composite conductors.

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