scholarly journals Efficiently self-healing boronic ester crystals

2020 ◽  
Vol 11 (10) ◽  
pp. 2606-2613 ◽  
Author(s):  
Patrick Commins ◽  
Marieh B. Al-Handawi ◽  
Durga Prasad Karothu ◽  
Gijo Raj ◽  
Panče Naumov
Keyword(s):  
Organic Crystal ◽  
Self Healing ◽  
Boronic Ester ◽  
Order Of Magnitude

Organic crystal is described that can be bent plastically and twisted elastically, and can self-heal to 67%, an efficiency that is an order-of-magnitude higher compared to the only previously reported example.

Biobased, Biodegradable, Self-Healing Boronic Ester Vitrimers from Epoxidized Soybean Oil Acrylate

2020 ◽  
Author(s):  
Arkadiusz Zych ◽  
Jonathan Tellers ◽  
Laura Bertolacci ◽  
Luca Ceseracciu ◽  
Lara Marini ◽  
...  
Keyword(s):  
Soybean Oil ◽  
Epoxidized Soybean Oil ◽  
Self Healing ◽  
Boronic Ester

High Throughput Continuous Fabrication of Large Surface Area Microstructured PDMS

2009 ◽  
Author(s):  
Franklin J. DiBartolomeo ◽  
Christine A. Trinkle
Keyword(s):  
Surface Area ◽  
Soft Lithography ◽  
Large Surface Area ◽  
Self Healing ◽  
The Novel ◽  
Current Standard ◽  
Flexible Material ◽  
Order Of Magnitude ◽  
Surface Patterns ◽  
Continuous Fabrication

Rapid creation of devices with microscale features is a vital step in the commercialization of a wide variety of technologies, such as microfluidics, fuel cells and self-healing materials. The current standard for creating many of these microstructured devices utilizes the inexpensive, flexible material poly-dimethylsiloxane (PDMS) to replicate microstructured molds. This process is inexpensive and fast for small batches of devices, but lacks scalability and the ability to produce large surface-area materials. The novel fabrication process presented in this paper uses a cylindrical mold with microscale surface patterns to cure liquid PDMS prepolymer into continuous microstructured films. Results show that this process can create continuous sheets of micropatterned devices at a rate of 3.94 in2/sec (100 mm2/sec), almost an order of magnitude faster than soft lithography, while still retaining submicron patterning accuracy.

A probabilistic approach for design and certification of self-healing advanced composite structures

2011 ◽  
Vol 225 (4) ◽  
pp. 435-449 ◽  
Author(s):  
H R Williams ◽  
R S Trask ◽  
I P Bond
Keyword(s):  
Composite Structures ◽  
High Performance ◽  
Probabilistic Approach ◽  
Healing Time ◽  
Self Healing ◽  
Structural Failure ◽  
Healing System ◽  
Order Of Magnitude ◽  
Damage Tolerant

Design and certification of novel self-healing aerospace structures was explored by reviewing the suitability of conventional deterministic certification approaches. A sandwich structure with a vascular network self-healing system was used as a case study. A novel probabilistic approach using a Monte Carlo method to generate an overall probability of structural failure yields notable new insights into design of self-healing systems, including a drive for a faster healing time of less than two flight hours. In the case study considered, a mature self-healing system could be expected to reduce the probability of structural failure (compared to a conventional damage-tolerant construction) by almost an order of magnitude. In a risk-based framework this could be traded against simplified maintenance activity (to save cost) and/or increased allowable stress (to allow a lighter structure). The first estimate of the increase in design allowable stresses permitted by a self-healing system is around 8 per cent, with a self-healing system much lighter than previously envisaged. It is thought these methods and conclusions could have wider application to self-healing and conventional high-performance composite structures.

Maximizing the symbiosis of static and dynamic bonds in self-healing boronic ester networks

2018 ◽  
Vol 9 (15) ◽  
pp. 2011-2020 ◽  
Author(s):  
Jessica J. Cash ◽  
Tomohiro Kubo ◽  
Daniel J. Dobbins ◽  
Brent S. Sumerlin
Keyword(s):  
Self Healing ◽  
Boronic Ester

Networks that contain boronic ester crosslinks undergo dynamic bond exchange that enables self-healing behavior and reprocessing.

Covalently cross-linked polymer stabilized electrolytes with self-healing performance via boronic ester bonds

2020 ◽  
Vol 11 (36) ◽  
pp. 5893-5902 ◽  
Author(s):  
Sibo Li ◽  
Cai Zuo ◽  
Yong Zhang ◽  
Jirong Wang ◽  
Huihui Gan ◽  
...  
Keyword(s):  
Polymer Electrolytes ◽  
Solid Polymer Electrolytes ◽  
Solid Polymer ◽  
Self Healing ◽  
Boronic Ester ◽  
Facile Fabrication ◽  
Polymer Stabilized

This article reported a facile fabrication of self-healing solid polymer electrolytes via boronic ester bonds.

scholarly journals Laboratory investigation of self-healing properties on geosynthetic clay liners with flaw

2015 ◽  
Vol 41 (1) ◽  
pp. 53-58 ◽  
Author(s):  
Guang-Wei Zhang ◽  
Hu-Yuan Zhang ◽  
Jin-Fang Wang ◽  
Lang Zhou ◽  
Ping Liu ◽  
...  
Keyword(s):  
Hydraulic Conductivity ◽  
The Self ◽  
Distilled Water ◽  
Self Healing ◽  
Test Results ◽  
Geosynthetic Clay Liners ◽  
Clay Liners ◽  
Order Of Magnitude ◽  
Flexible Wall ◽  
Research Findings

Abstract The objective of this paper is to evaluate the self- healing properties of a commercially-available geosynthetic clay liner (GCL) using flexible-wall permeameter. The GCLs are produced by the same factory, but the contents of bentonite are different. Also the hydraulic conductivities (HC) of GCLs with no defect are different. In this study, specimens were completely saturated under the backpressure of 20 kPa before the test. Permeability tests were performed on GCL specimens with penetrating flaw and also on specimens permeated with distilled water and CaCl2 solutions. The test results were presented and discussed. Experimental results showed that the GCL with penetrating flaw did not exhibit complete self-healing in the case of flaw. After 120 days, the hydraulic conductivity increased by approximately an order of magnitude. In addition, CaCl2 solutions had a significant influence on the hydraulic conductivity. The research findings might be of interest to researchers and engineers who design liners for landfills and other liquid containment facilities

scholarly journals Internal and external catalysis in boronic ester networks

2021 ◽  
Author(s):  
Boyeong Kang ◽  
Julia Kalow
Keyword(s):  
Mechanical Properties ◽  
Binding Affinity ◽  
Polymer Networks ◽  
Model Systems ◽  
Self Healing ◽  
Dynamic Materials ◽  
Boronic Ester ◽  
Rate Acceleration ◽  
Exchange Spectroscopy ◽  
Kinetics Of

In dynamic materials, the reversible condensation between boronic acids and diols provides adaptability, self-healing ability, and responsiveness to small molecules and pH. Recent work has shown that the thermodynamics and kinetics of bond exchange determine the mechanical properties of dynamic polymer networks. However, prior studies have focused on how structural and environmental factors influence boronic acid–diol binding affinity, and design rules for tuning the kinetics of this dynamic bond are lacking. In this work, we investigate the effects of diol (or polyol) structure and salt additives on the rate of bond exchange, binding affinity, and the mechanical properties of the corresponding polymer networks. To better mimic the environment of polymer networks in our small-molecule model systems, we incorporated proximal amide groups, which are used to conjugate diols to polymers, and included salts commonly found in buffers. Using one-dimensional selective exchange spectroscopy (1D EXSY), we find that both proximal amides and buffering anions induce significant rate acceleration consistent with internal and external catalysis, respectively. This rate acceleration is reflected in the stress relaxation of gels formed using PEG modified with different alcohols, and in the presence of salts containing acetate or phosphate. These findings contribute to the fundamental understanding of the boronic ester dynamic bond and offer new molecular strategies to tune the macromolecular properties of dynamic materials.

Boronic ester-based self-healing hydrogels formed by using intermolecular B-N coordination

Polymer ◽  
2020 ◽  
Vol 202 ◽  
pp. 122624
Author(s):  
Yusheng Liu ◽  
Yigang Liu ◽  
Qiuxia Wang ◽  
Yugui Han ◽  
Yebang Tan
Keyword(s):  
Self Healing ◽  
Boronic Ester

Stabilization of catechol–boronic ester bonds for underwater self-healing and recycling of lipophilic bulk polymer in wider pH range

2016 ◽  
Vol 4 (37) ◽  
pp. 14122-14131 ◽  
Author(s):  
Nan Nan Xia ◽  
Min Zhi Rong ◽  
Ming Qiu Zhang
Keyword(s):  
Quaternary Ammonium ◽  
Quaternary Ammonium Salts ◽  
Ammonium Salts ◽  
Self Healing ◽  
Bulk Polymer ◽  
Boronic Ester ◽  
Ph Range

Polyurethane crosslinked by catechol–boronic ester bonds with quaternary ammonium salts is allowed to self-heal and recycle in waters of pH 7 and 9.

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