A thermally remendable and reprocessable crosslinked methyl methacrylate polymer based on oxygen insensitive dynamic reversible C–ON bonds

Zhang, Ze Ping; Lü, Yan; Rong, Min Zhi; Zhang, Ming Qiu

doi:10.1039/c5ra22275c

Cited by 32 publications

(19 citation statements)

References 29 publications

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“…These results are consistent with previous reports . By further using Raman spectroscopy, the stretching vibration of the carbon–carbon double bond at 1634 cm −1 could be clearly observed [Figure (b), Figure S3(a,b)]. The above analysis demonstrates that three kinds of functional prepolymers have been successfully synthesized as planned.…”

Section: Resultssupporting

confidence: 90%

Self‐healable and thiol–ene UV‐curable waterborne polyurethane for anticorrosion coating

Zhang

Rong

et al. 2019

J of Applied Polymer Sci

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Thiol-ene ultraviolet-curable waterborne polyurethane (WPU) crosslinked networks capable of self-healing of cracks were developed for anticorrosion coating application. The healing mechanism is attributed to the rearrangement of the crosslinked networks caused by triethylamine-catalyzed thiol-disulfide exchange reaction proved by high-performance liquid chromatography, gel permeation chromatography, and rheology tests. The crack remendability can be repeated for at least two times as demonstrated by visual inspection. Moreover, the self-healing effect was further demonstrated in terms of corrosion and electrochemical tests. Comparatively, the control specimens without disulfide bonds were not self-healable. The present study provides a simple way for achieving self-healing WPU to conform to the trend of development of high performance and environmental friendly anticorrosive coatings.

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Section: Resultssupporting

confidence: 90%

Self‐healable and thiol–ene UV‐curable waterborne polyurethane for anticorrosion coating

Zhang

Rong

et al. 2019

J of Applied Polymer Sci

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“…Recycling of dynamically bonded polymers through heat or water stimulus has been reported elsewhere, 21,22,[35][36][37][38][39][40][41] but the application of light stimulus in this aspect has not yet been reported to our knowledge. The benefit of sunlight triggered disulfide exchange is also reflected by the ability of reshaping of PU-HEDS-400.…”

Section: Resultsmentioning

confidence: 99%

Sunlight driven self-healing, reshaping and recycling of a robust, transparent and yellowing-resistant polymer

2016

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† Electronic Supplementary Information (ESI) available: FTIR spectra, Raman spectrum, 1 H NMR spectra, UV-visible spectra, mass spectrum, HPLC spectra, DSC heating curves, tensile stress-strain curves, effect of exposure time of xenon lamp light on Young's modulus, and tabulated mechanical properties and healing efficiencies. See For realizing sunlight stimulated self-healing, a crosslinked polyurethane carrying disulfide in the main chain is synthesized. Its macromolecular composition and architecture are optimized so that the included disulfide bonds can take part in exchange reaction simply under illumination of the low concentration UV component of sunlight. Accordingly, the damaged polymer is allowed to be repeatedly healed in the sun in terms of strength restoration as a result of phototriggered reversible exchange of disulfide bonds. Meanwhile, the elaborately introduced hydrogen bonding helps to quickly close crack, favoring intimate contacts of cracked surface and subsequent interaction of dangling chains across the interface, and eventually raising effectiveness of photo-reaction of the disulfide bonds in solid phase. In addition, networks rearrangement due to disulfide exchange enables multiple recycling and reshaping of the polymer under sunshine. The present proof-of-concept work would be hopefully developed into a cost-effective and environmentally friendly technology of design, fabrication and application of smart photo-sensitive polymer with higher mechanical strength.

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“…Unfortunately, some of the systems lack the stability against oxygen under ambient conditions. Later on, improvements in terms of the sensitivity to air as well as the ability to adjust the homolysis temperature could be shown by variation of the chemical structure . The versatility of alkoxyamines as reversible covalent bonds in self‐healing systems allows also the homolytic cleavage of the bonds by UV irradiation.…”

Section: Healable Polymers Based On Exchange Reactions and Metathesismentioning

confidence: 99%

How to Design a Self‐Healing Polymer: General Concepts of Dynamic Covalent Bonds and Their Application for Intrinsic Healable Materials

Dahlke

Zechel

Hager

et al. 2018

Adv Materials Inter

198

177

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In this work, the fundamental design principles of intrinsic self‐healing, polymeric materials with reversible, covalent bonds are described and summarized. The most important properties with regard to the healing ability and potential applications are discussed. A classification of synthetic strategies toward polymers as well as polymer networks and their effect on the properties is given to gain further insight into known design strategies for healable materials. In order to evaluate the advantages and disadvantages of different covalent bonding types, recent examples of intrinsic healable polymers are compared and evaluated. In addition, the unique behavior of vitrimers as a new type of polymer networks is explained. In the end, a short outlook on future work in the field of self‐healing polymers concludes this review.

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A thermally remendable and reprocessable crosslinked methyl methacrylate polymer based on oxygen insensitive dynamic reversible C–ON bonds

Abstract: A strategy for developing self-healing crosslinked polymer with alkoxyamine is proposed, which ensures air resistance even at higher homolysis temperature.

Cited by 32 publications

References 29 publications

Self‐healable and thiol–ene UV‐curable waterborne polyurethane for anticorrosion coating

Self‐healable and thiol–ene UV‐curable waterborne polyurethane for anticorrosion coating

Sunlight driven self-healing, reshaping and recycling of a robust, transparent and yellowing-resistant polymer

How to Design a Self‐Healing Polymer: General Concepts of Dynamic Covalent Bonds and Their Application for Intrinsic Healable Materials

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