Water-adaptive and repeatable self-healing polymers bearing bulky urea bonds

2018 ◽  
Vol 9 (1) ◽  
pp. 11-19 ◽  
Author(s):  
J. I. Park ◽  
A. Choe ◽  
M. P. Kim ◽  
H. Ko ◽  
T. H. Lee ◽  
...  
Keyword(s):  
Covalent Bond ◽  
Self Healing ◽  
Reversible Covalent

A crosslinked copolymer having a reversible covalent bond between a bulky amine and an isocyanate presents reshapable, repeatable, and water-adaptive self-healing properties.

Phenylboronic Acid-polymers for Biomedical Applications

2019 ◽  
Vol 26 (37) ◽  
pp. 6797-6816 ◽  
Author(s):  
Ji Hyun Ryu ◽  
Gyeong Jin Lee ◽  
Yu-Ru V. Shih ◽  
Tae-il Kim ◽  
Shyni Varghese
Keyword(s):  
Biomedical Applications ◽  
Phenylboronic Acid ◽  
Covalent Bond ◽  
Self Healing ◽  
Stimuli Responsive ◽  
Dynamic Nature ◽  
Responsive Materials ◽  
Boronate Ester ◽  
Reversible Bonding ◽  
Reversible Covalent

Background: Phenylboronic acid-polymers (PBA-polymers) have attracted tremendous attention as potential stimuli-responsive materials with applications in drug-delivery depots, scaffolds for tissue engineering, HIV barriers, and biomolecule-detecting/sensing platforms. The unique aspect of PBA-polymers is their interactions with diols, which result in reversible, covalent bond formation. This very nature of reversible bonding between boronic acids and diols has been fundamental to their applications in the biomedical area. Methods: We have searched peer-reviewed articles including reviews from Scopus, PubMed, and Google Scholar with a focus on the 1) chemistry of PBA, 2) synthesis of PBA-polymers, and 3) their biomedical applications. Results: We have summarized approximately 179 papers in this review. Most of the applications described in this review are focused on the unique ability of PBA molecules to interact with diol molecules and the dynamic nature of the resulting boronate esters. The strong sensitivity of boronate ester groups towards the surrounding pH also makes these molecules stimuli-responsive. In addition, we also discuss how the re-arrangement of the dynamic boronate ester bonds renders PBA-based materials with other unique features such as self-healing and shear thinning. Conclusion: The presence of PBA in the polymer chain can render it with diverse functions/ relativities without changing their intrinsic properties. In this review, we discuss the development of PBA polymers with diverse functions and their biomedical applications with a specific focus on the dynamic nature of boronate ester groups.

Synthesis and self‐healing investigation of waterborne polyurethane based on reversible covalent bond

2022 ◽  
pp. 52144
Author(s):  
Jingyu Ren ◽  
Xiangbin Dong ◽  
Yanjie Duan ◽  
Lin Lin ◽  
Xiaowei Xu ◽  
...  
Keyword(s):  
Covalent Bond ◽  
Waterborne Polyurethane ◽  
Self Healing ◽  
Reversible Covalent

Oxime crosslinked polymer networks: Is every reversible covalent bond suitable to create self-healing polymers?

2016 ◽  
Vol 133 (44) ◽  
Author(s):  
Natascha Kuhl ◽  
Marcus Abend ◽  
Stefan Bode ◽  
Ulrich S. Schubert ◽  
Martin D. Hager
Keyword(s):  
Polymer Networks ◽  
Covalent Bond ◽  
Self Healing ◽  
Crosslinked Polymer ◽  
Reversible Covalent

Acylhydrazones as Reversible Covalent Crosslinkers for Self-Healing Polymers

2015 ◽  
Vol 25 (22) ◽  
pp. 3295-3301 ◽  
Author(s):  
Natascha Kuhl ◽  
Stefan Bode ◽  
Ranjita K. Bose ◽  
Jürgen Vitz ◽  
Andreas Seifert ◽  
...  
Keyword(s):  
Self Healing ◽  
Reversible Covalent

scholarly journals Molecular recognition of organic ammonium ions in solution using synthetic receptors

2010 ◽  
Vol 6 ◽  
Author(s):  
Andreas Späth ◽  
Burkhard König
Keyword(s):  
Molecular Recognition ◽  
Hydrophobic Interactions ◽  
Covalent Bond ◽  
Ammonium Ion ◽  
Synthetic Receptors ◽  
Ammonium Ions ◽  
Wide Range ◽  
Covalent Bond Formation ◽  
Reversible Covalent ◽  
Ion Receptors

Ammonium ions are ubiquitous in chemistry and molecular biology. Considerable efforts have been undertaken to develop synthetic receptors for their selective molecular recognition. The type of host compounds for organic ammonium ion binding span a wide range from crown ethers to calixarenes to metal complexes. Typical intermolecular interactions are hydrogen bonds, electrostatic and cation–π interactions, hydrophobic interactions or reversible covalent bond formation. In this review we discuss the different classes of synthetic receptors for organic ammonium ion recognition and illustrate the scope and limitations of each class with selected examples from the recent literature. The molecular recognition of ammonium ions in amino acids is included and the enantioselective binding of chiral ammonium ions by synthetic receptors is also covered. In our conclusion we compare the strengths and weaknesses of the different types of ammonium ion receptors which may help to select the best approach for specific applications.

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