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Solvent-Free Synthesis of Self-Healable and Recyclable Crosslinked Polyurethane Based on Dynamic oxime-urethane bonds

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Chinese Journal of Polymer Science 2023年第11期41卷 1725-1732,I0007页

作者： Yuepeng Wang Lei Yang Luzhi Zhang Hongfei Huang Bo Qian Shijia Gu Zhengwei You State Key Laboratory for Modification of Chemical Fibers and Polymer Materials Institute of Functional MaterialsCollege of Materials Science and EngineeringDonghua UniversityShanghai 201620China

Polyurethane is widely used for its versatility in design and range of ***-healing and recyclable dynamic polyurethane networks have attracted extensive attention due to their potential to extend service life and ensure safety in use,as well as to promote sustainable use of *** green and environment-friendly methods to obtain this material is an interesting and challenging task,as the majority of current dynamic polyurethane networks utilize the solution polymerization *** use of solvents makes the processes complicated,harmful to environment,and increase the ***(oxime-urethanes)(POUs)are emerging dynamic polyurethanes and show great potential in diverse fields,such as biomaterials,hot melt adhesives,and flexible *** this study,we utilized the solubility properties of dimethylglyoxime in raw material poly(ethylene glycol)to prepare POUs through bulk polymerization for the first *** method is simple,convenient and ***,copper ion coordination improves POUs strength and dynamic properties,with mechanical strength up from 0.54 MPa to 1.03 MPa and self-healing recovery rate up from 85.5%to 91.8%,and activation energy down from 119.6 k J/mol to 95.4 k J/*** demonstrate the application of this technology,self-healing and stretchable circuits are constructed from this dynamic polyurethane network.

关键词： Polyurethane Dynamic covalent bonds oxime-urethane bonds Self-healing Recycle

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Supertough spontaneously self-healing polymer based on septuple dynamic bonds integrated in one chemical group

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Science China Chemistry 2022年第2期65卷 363-372页

作者： Luzhi Zhang Qingbao Guan Ao Shen Rasoul Esmaeely Neisiany Zhengwei You Meifang Zhu State Key Laboratory for Modification of Chemical Fibers and Polymer Materials Shanghai Belt and Road Joint Laboratory of Advanced Fiber and Low-dimension Materials(Donghua University)College of Materials Science and EngineeringShanghai Engineering Research Center of Nano-Biomaterials and Regenerative MedicineInstitute of Functional MaterialsDonghua UniversityResearch Base of Textile Materials for Flexible Electronics and Biomedical ApplicationsChina Textile Engineering SocietyShanghai 201620China Department of Materials and Polymer Engineering Hakim Sabzevari UniversitySabzevar ***Iran

The development of spontaneously self-healing materials with excellent mechanical properties remains a formidable challenge despite the extensive interest in such *** is because the self-healing and mechanical properties of a material are usually optimized via contradictory *** present study demonstrated a supertough spontaneously self-healing polymer,Fe-(2,6-diacetylpyridine dioxime)-urethane-based polyurethane(Fe-PPOU)based on septuple dynamic bonds integrated in one chemical group.A synergistic effect was induced by the presence of multiple dynamic crosslinking points,which comprised the integrated dynamic interactions,and the hidden lengths of the folded polymeric chains in ***,the mechanical and self-healing properties of the polymer were simultaneously ***-PPOU demonstrated the highest reported toughness(139.8 MJ m^(-3))among all the room-temperature spontaneously self-healing polymers with a nearly 100%healing ***-PPOU exhibited instant(30 s)self-healing to reach a strength of 1.6 MPa that was higher than the original strength of numerous recently reported self-healing polymers.

关键词： oxime-urethane bonds hydrogen bonds metal-coordination bonds 2 6-diacetylpyridine dioxime self-healing

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