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| 1 | Dynamic Oxime-Urethane Bonds, a Versatile Unit of High Performance Self-healing Polymers for Diverse Applications显示文摘Oxime-urethane bond featuring with high reversibility even at room temperature and multiple reactivity is an emerging dynamic covalent bond,and has shown great potential for self-healing polymers,which are one of the most attractive development directions for next generation of polymeric materials.In this review,recent progresses on the oxime-urethane-based self-healing polymers,including their designs and applications in diverse fields such as biomedicine,flexible electronics,soft robots,3D printing,protective materials,and adhesives,are summarized,and outlooks on the future development of this field are discussed. | Luzhi Zhang Zhengwei You | 2021 | Chinese Journal of Polymer Science2021，39，10： | 2 |
| 2 | A high-strength self-healing nano-silica hydrogel with anisotropic differential conductivity显示文摘Soft nano electronic materials based on conductive hydrogels have attracted considerable attention due to their exceptional properties.Particle deposition and poor interface compatibility often diminish the mechanical strength and electron transport capabilities of the conductive hydrogel.Mechanical damage can severely impact the performance of the conductive hydrogel and can even damage electronic devices based on the conductive hydrogel.In the current study,a transparent nano-silica hydrogel is prepared by employing an extremely easy-to-operate method.This approach can preclude the deposition of particles via strong mechanical force.In addition,controlling the concentration of the reaction interface makes the hydrogel grow along the mechanical force in the direction with a special directional hole structure formed.The hydrogel is transparent,showing excellent self-healing properties—it can self-heal within 15 seconds.Remarkably,the hydrogel after self-healing maintains its performance.Moreover,it has excellent mechanical properties and can be stretched in length.Up to 1,200%of the original length,the tensile strength of the gel spline can reach 7 MPa.The viscosity of the hydrogel can reach 1.67×10^(8)(MPs).In addition,a large amount of Na+in this hydrogel endow it a conductivity of 389 ps/cm.The conductivity of this hydrogel is adjustable result from the special pore structure.Lastly,the difference between the horizontal and vertical conductivity of the same sample can reach 3-4 times,thus this hydrogel can be used in the field of nano conductive materials. | Xingyu Huang Xiaofan Zhou Hao Zhou Yidan Zhong Hui Luo Fan Zhang | 2021 | Nano Research2021，14，8： | 1 |
| 3 | Preparation and Characterization of Attractive Poly(amino acid)Hydrogels Based on 2-Ureido-4[1H]-pyrimidinone显示文摘Self-healing hydrogels with the shear-thinning property are novel injectable materials and are superior to traditional injectable hydrogels.The self-healing hydrogels based on 2-ureido-4[1 H]-pyrimidinone(UPy)have recently received extensive attention due to their dynamic reversibility of UPy dimerization.However,generally,UPy-based self-healing hydrogels exhibit poor stability,cannot degrade in vivo and can hardly be excreted from the body,which considerably limit their bio-application.Here,using poly(l-glutamic acid)(PLGA)as biodegradable matrix,branchingα-hydroxy-ω-amino poly(ethylene oxide)(HAPEO)as bridging molecule to introduce UPy,and ethyl acrylate polyethylene glycol(MAPEG)to introduce double bond,the hydrogel precursors(PMHU)are prepared.A library of the self-healing hydrogels has been achieved with well self-healable and shear-thinning properties.With the increase of MAPEG grafting ratio,the storage modulus of the self-healing hydrogels decreases.The self-healing hydrogels are stable in solution only for 6 h,hard to meet the requirements of tissue regeneration.Consequently,ultraviolet(UV)photo-crosslinking is involved to obtain the dual crosslinking hydrogels with enhanced mechanical properties and stability.When MAPEG grafting ratio is 35.5%,the dual crosslinking hydrogels can maintain the shape in phosphate-buffered saline solution(PBS)for at least 8 days.Loading with adipose-derived stem cell spheroids,the self-healing hydrogels are injected and self-heal to a whole,and then they are crosslinked in situ via UV-irradiation,obtaining the dual crosslinking hydrogels/cell spheroids complex with cell viability of 86.7%±6.0%,which demonstrates excellent injectability,subcutaneous gelatinization,and biocompatibility of hydrogels as cell carriers.The novel PMHU hydrogels crosslinked by quadruple hydrogen bonding and then dual photo-crosslinking of double bond are expected to be applied for minimal invasive surgery or therapies in tissue engineering. | Zhen Shi Qi Wang Gui-Fei Li Yu-Feng Shou Hong-Jie Zong Shi-Feng Yan Kun-Xi Zhang Jing-Bo Yin | 2021 | Chinese Journal of Polymer Science2021，39，3： | 1 |
| 4 | Surface Patterning of Self-healing P(MMA/nBA)Copolymer for Dynamic Control Cell Behaviors显示文摘Cell behaviors are regulated by a dynamic and complex environment characterized by biophysical,mechanical and biochemical properties.However,most works regulate cell behaviors under static conditions or by external factors.To control cell adhesion and proliferation with a dynamic and mechanical environment,we pattern the surface on self-healing copolymer P(MMA/nBA).The copolymer P(MMA/nBA)with the composition of 48/52(MMA/nBA)recovers nearly 100%of its original tensile strains after 86 h of recovery from deformation.The physical patterns on P(MMA/nBA)film are obtained over large areas and the size of the hole and the width of connecting bar are in line with the copper grid specifications.The patterned surface tends to be fiat after 12 h with almost 75%-80%recovery.Compared with cell incubation on polystyrene fiat and patterned surface of P(MMA/nBA)film without self-healing capability,the number and morphology of cells are well manipulated on the patterned surface of self-healing P(MMA/nBA)film.This approach provides a convenient method for dynamically regulating the cell behaviors on the surface of self-healing materials without chemical or biological modifications. | Su-Su Liu Ze-Hong Xiang Zhi-Fang Ma Xue-Wen WU Qiang Shi Shing-Chung Wong Jing-Hua Yin | 2020 | Chinese Journal of Polymer Science2020，38，7： | 1 |
| 5 | Dynamic chemistry in ionic liquid-based conductor显示文摘Ionic liquids,as a kind of liquid conductors with the unique inherent abilities of rapid self-healing,highly adaptive deformation,reconstruction,as well as high ionic conductivity,have been highly praised and recommended as a new competitive conducting material for green electronics.However,ionic liquids are likely encountered with the leakage problems when they are integrated into electronic devices.This issue as well as the need to develop intelligent electronics stimulate the innovation of ionic liquids with response characters besides conducting performance.Some'innovative'or'functional'ionic liquids consisting dynamic chemical bonds can reversibly switch between different states in response to external stimuli.These specialized ionic liquids afford powerful supplements to minimize the issue of leakage of ionic liquid conductors from electrical circuits,and also exhibit the properties of self-healing,reprocessing,adaptive deformation,which accord with the forthcoming era of Internet of Things.This minireview systematically summarizes the progresses of ionic liquid-based conductors containing dynamic bonds,particularly highlighting their applicable merits in self-healing,stretchable,and recyclable aspects.We also discuss the challenges in the next period and describe an unambiguous future of this research area. | Zhiwu Chen Qinyuan Gui Yapei Wang | 2021 | Green Chemical Engineering2021，2，4： | 1 |
| 6 | 含咪唑离子聚乙烯离聚体的合成与性能显示文摘利用双(β-二酮单亚胺)钛催化乙烯和5-碘甲基降冰片烯(IMNB)的配位共聚,高效合成了高分子量、窄分子量分布和组分可控的烯烃共聚物.将该含有碘甲基侧基的共聚物与N-甲基咪唑进行亲核取代反应,然后再与有机金属盐进行离子交换,制备了一系列带有甲磺酸根(CH3SO3^-)、三氟甲磺酸根(CF3SO3^-)或双(三氟甲磺酰)亚胺负离子(Tf2N^-)的聚乙烯离聚体.研究表明,离子基团的引入会破坏聚合物的结晶,熔融温度和结晶度均随着离子含量的增加而降低.但离聚体的玻璃化转变温度却高于乙烯/IMNB共聚物,表明离子基团之间的强相互作用抑制了链段运动.与共聚物前体相比,聚乙烯离聚体表现出更高的热稳定性、更好的亲水性和更高的抗拉强度.当离子含量相同时,聚乙烯离聚体的抗拉强度顺序为:CH3SO3^->CF3SO3^->Tf2N^-,而断裂伸长率呈现相反的趋势. | 张俊 王彬 潘莉 马哲 李悦生 | 2020 | 高等学校化学学报2020，41，9： | 1 |
| 7 | 聚合物自愈合机制及在生物医药领域的应用研究进展显示文摘聚合物自愈合主要依据聚合物的分子结构及其相互作用,部分需给予外部刺激,如光、热、pH等。近年来诸多研究发现聚合物的自愈合特性可延长材料的寿命,同时在愈合后仍保持着聚合物的机械性能。根据聚合物材料的作用方式不同,分为自主自愈合和非自主自愈合。其中自主自愈合主要通过可逆的共价键(席夫碱键、狄尔斯-阿尔德反应、酰肼键)、可逆非共价键(氢键、金属-配体配位键、静电相互作用、π-π堆积、疏水相互作用)或二者结合发挥作用。具有独特的自愈合特性的药物载体在生物大分子的封装和稳定释放方面起着重要作用。本综述根据聚合物的自愈合机制及其在生物医药领域中的应用进行了简要的总结讨论。 | 王金月 邸金威 吕立勋 郑爱萍 赵琳琳 高静 | 2023 | 药学学报2023，58，1： | 0 |
| 8 | Flame-retardant and Self-healing Biomass Aerogels Based on Electrostatic Assembly显示文摘It remains a significant challenge to fabricate self-healing aerogels with excellent flame retardancy.Herein,we develop a class of biomass aerogels by electrostatically assembling chitosan(CS),phytic acid(PA),and itaconic acid(IA).The electrostatic interaction between CS and IA is weak and dynamic,so freeze-drying the solution of CS and IA enables the formation of continuous aerogel skeleton with self-healing ability and re-programmability;in comparison,the electrostatic interaction between CS and PA is strong and less dynamic,and thus mixing PA with CS in aqueous solution leads to fine precipitates of high flame retardancy due to the synergistic phosphorus-nitrogen effect.Integrating the continuous skeleton and the fine precipitates results in self-healing aerogles with UL-4 V-0 rating of flame retardancy aerogels and autoextinguishable feature.Interestingly,the aerogels after burning in flame for 30 s form a skin-core structure,and the carbonized skin protects the integrity of the aerogels and the self-healing ability of the internal parts.Therefore,this work provides a facile strategy to develop multifunctional aerogels which hold great promise for advanced applications. | Ji-Yu Yang Yu Xia Jin Zhao Long-Fei Yi Yong-Jiao Song Hong Wu Shao-Yun Guo Li-Juan Zhao Jin-Rong Wu | 2020 | Chinese Journal of Polymer Science2020，38，12： | 0 |
| 9 | The Latest Research Progress of New Self-Repairing Energetic Compositest显示文摘This review summarizes research progress in self-repairing energetic composites based on the design of chemical structure of binders and the introduction of self-repairing properties between composite interfaces.Researchers have prepared the polyurethane-urea binder and the GAP self-repairingbinder based on the disulfide bond,the polyurethane binder and FTPB-PDMl binder based on the Diels-Alder reaction,and the polyurethane binderbased on dynamic photocroslinking reaction.In addition,PVDF-coHFP/EMIOTf/graphene achieves the self-repairing behavior of the polymer bondedexplosive(PBX).The future development of elf-repairing energetc composites is proposed.lt is pointed out that the mechanical properties,processingproperties and energy properties should be improved together with the introduction of self-repairing properties,and the energetic composites whichcan be repaired in various ways should be prepared. | Yan-Jie Zhang Min Xia Wei Yang Fan-Zhi Yang Guo-Ping Li Yun-Jun Luo | 2020 | Chinese Journal of Chemistry2020，38，12： | 0 |
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