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High Voltage 2017年第1期2卷 32-38页

作者： Longhui Zheng Li Yuan qingbao guan Aijuan Gu Guozheng Liang College of Chemistry Chemical Engineering and Materials ScienceSoochow UniversitySuzhouJiangsu 215123People’s Republic of China

High dielectric loss has been the biggest sticky problem for high-k conductor/polymer ***,a new asymmetric material consisting of one layer ofβ-phase poly(vinylidene fluoride)(PVDF)and another layer of carboxylated carbon nanotube(eCNT)/cyanate ester(CE)composite was fabricated,coded as PVDFx–eCNTq/CE,where x is the thickness of PVDF layer ranging from 3 to 70μm,q is the loading of eCNTs(f),taking values of 1.2 and 1.7 wt%.The influences of f and x values on dielectric properties and breakdown strengths of PVDF–eCNT/CE materials were systematically *** f is smaller than the percolation threshold(fc)of eCNT/CE(fc=1.6 wt%),the corresponding PVDF–eCNT1.2/CE materials have similar conductive and dielectric properties as eCNT1.2/CE *** f>fc,all PVDF–eCNT1.7/CE materials have much lower dielectric loss than eCNT1.7/CE,while with suitable thickness of PVDF layer(<70μm),PVDF–eCNT/CE materials have significantly improved dielectric constants and breakdown *** the PVDF–eCNT1.7/CE material of which the thickness of PVDF layer is 5μm,its dielectric constant at 1 Hz is 1699,about ten times of that of eCNT1.7/CE,while the dielectric loss is only 2.31×10−2 times of that of the *** origin behind was intensively studied in terms of space charge distribution.

关键词： dielectric origin asymmetric

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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3D printing preview for stereo-lithography based on photopolymerization kinetic models

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Bioactive Materials 2020年第4期5卷 798-807页

作者： Yi Gao Lei Xu Yang Zhao Zhengwei You qingbao guan 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 EngineeringDonghua UniversityShanghai201620PR China Center for Combustion Energy and Key Laboratory for Thermal Science and Power Engineering of MOE Tsinghua UniversityBeijing100084China Institute of Agricultural Facilities and Equipment Jiangsu Academy of Agricultural SciencesKey Laboratory for Protected Agricultural Engineering in the Middle and Lower Reaches of Yangtze RiverMinistry of Agriculture and Rural AffairsNanjing210014PR China

The diversity of biomedical applications makes stereolithographic(SL)three-dimensional(3D)printing process complex.A strategy was developed to simulate the layer-by-layer fabrication of 3D printed products combining polymerization kinetic with reaction conditions to realize print *** a representative example,the typical UV-curable dental materials based on epoxy acrylate and photoinitiator with different molar ratios was exposed under varying intensity of UV light to verify the simulation results.A theoretical kinetics model containing oxygen inhibition was ***-situ FTIR was employed to measure propagation and termination constants while coupled UV/vis was performed to examine the law of light attenuation during cure reaction,even with various colours and *** results showed that the correlation coefficient square between the experiments and simulations of epoxy acrylate with 1%,2%and 3%initiator upon 20 mW/cm2 UV light are 0.8959,0.9324 and 0.9337,***,our simulation of photopolymerization for SL 3D printing successfully realized visualization of printing quality before practically printing the targeted biomedical objects with complex topology structures.

关键词： 3D printing preview Photopolymerization kinetics Biomedical applications Dental materials Epoxy acrylate

Photo-responsive shape memory polymer composites enabled by doping with biomass-derived carbon nanomaterials

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Nano Research 2022年第2期15卷 1383-1392页

作者： Nina Yan Zhiyu Zheng Yunliang Liu Xizhi Jiang Jiamin Wu Min Feng Lei Xu qingbao guan Haitao Li Institute of Agricultural Facilities and Equipment Jiangsu Academy of Agricultural SciencesKey Laboratory for Protected Agricultural Engineering in the Middle and Lower Reaches of Yangtze RiverMinistry of Agriculture and Rural AffairsNanjing 210014China Institute for Energy Research School of Chemistry and Chemical EngineeringJiangsu UniversityZhenjiang 212013China State Key Laboratory for Modification of Chemical Fibers and Polymer Materials International Joint Laboratory for Advanced Fiber and Low-dimension MaterialsCollege of Materials Science and EngineeringDonghua UniversityShanghai 201620China

As photothermal conversion agents,carbon nanomaterials are widely applied in polymers for light-triggered shape memory behaviors on account of their excellent light ***,they are usually derived from non-renewable fossil resources,which go against the demand for sustainable ***-derived carbon nanomaterials are expected as alternatives if they are designed with good dispersibility as well as splendid photothermal *** to date,very few researches focused on this ***,we report a novel light-triggered shape memory composite by incorporating renewable biomass-derived carbon nanomaterials into acrylate polymers without deep purification and *** functionalized carbon nanomaterials not only have stable dispersion in polymers as fillers,but also can endow the polymers with excellent and stable thermal and photothermal responsive properties in biological friendly *** the introduction of biomass-derived carbon nanomaterials,the mechanical properties of the composites are also further enhanced with the formation of hydrogen bonding between the carbon nanomaterials and the ***,the doping of 1%carbon nanomaterials endows the polymer with sufficient hydrogen bonds that not only exhibit excellent thermal and photothermal responsive properties,but also with enough space for the motion of *** properties make such composite a promising and safe candidate for shape memory applications,which provide a new avenue in smart fabrics or intelligent soft robotics.

关键词： biomass carbon nanomaterials shape memory polymers thermal responsive photothermal responsive

Peptidoglycan-inspired autonomous ultrafast self-healing bio-friendly elastomers for bio-integrated electronics

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National Science Review 2021年第5期8卷 130-139页

作者： Luzhi Zhang Jiahui Liang Chenyu Jiang Zenghe Liu Lijie Sun Shuo Chen Huixia Xuan Dong Lei qingbao guan Xiaofeng Ye Zhengwei You State Key Laboratory for Modification of Chemical Fibers and Polymer Materials Shanghai Belt and Road Joint Laboratory of Advanced Fiber and Low-dimension MaterialsCollege of Materials Science and EngineeringDonghua University Department of Cardiac Surgery Ruijin HospitalShanghai Jiao Tong University School of Medicine

Elastomers are essential for stretchable electronics, which have become more and more important in bio-integrated devices. To ensure high compliance with the application environment, elastomers are expected to resist, and even self-repair, mechanical damage, while being friendly to the human ***, inspired by peptidoglycan, we designed the first room-temperature autonomous self-healing biodegradable and biocompatible elastomers, poly(sebacoyl 1,6-hexamethylenedicarbamate diglyceride)(PSe HCD) elastomers. The unique structure including alternating ester-urethane moieties and bionic hybrid crosslinking endowed PSeHCD elastomers superior properties including ultrafast self-healing,tunable biomimetic mechanical properties, facile reprocessability, as well as good biocompatibility and biodegradability. The potential of the PSeHCD elastomers was demonstrated as a super-fast self-healing stretchable conductor(21 s) and motion sensor(2 min). This work provides a new design and synthetic principle of elastomers for applications in bio-integrated electronics.

关键词： biomimetic elastomers ultrafast self-healing bio-integrated electronics stretchable conductor

Highly Transparent,Stretchable,and Self‑Healable Ionogel for Multifunctional Sensors,Triboelectric Nanogenerator,and Wearable Fibrous Electronics

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Advanced Fiber Materials 2022年第1期4卷 98-107页

作者： Lijie Sun Hongfei Huang Qiyu Ding Yifan Guo Wei Sun Zhuangchun Wu Minglin Qin qingbao guan Zhengwei You State Key Laboratory for Modifcation of Chemical Fibers and Polymer Materials International Joint Laboratory for Advanced Fiber and Low-Dimension MaterialsKey Laboratory of High Performance Fibers and ProductsMinistry of EducationCollege of Materials Science and EngineeringInstitute of Functional MaterialsDonghua University2999 North Renmin RoadShanghai 201620People’s Republic of China AccuPath Medical(Jiaxing)Co. Ltd1303 Yatai Rd.Nanhu DistrictJiaxing 314006People’s Republic of China

Ionogels with high transparency,stretchability and self-healing capability show great potential for wearable ***,a kind of highly transparent,stretchable and self-healable ionogels are designed using double physical cross-linking including hydrogen bonding and dipole–dipole *** to the dynamic and reversible nature of the ion–dipole interaction and hydrogen bonds of polymeric chains,the ionogel possesses good self-healing *** multifunctional sensors for strain and temperature are fabricated based on *** ionogel can serve as strain sensor that exhibited high sensitivity[gauge factor(GF)=3.06]and durability(1000 cycles)to a wide range of strains(0–300%).Meanwhile,the ionogel shows rapid response to temperature,due to the temperature dependence of its ionic ***,the ionogel fbers with excellent antifreezing(−20°C)capability are fabricated,and the fbers show the good sensing performance to human motions and ***,the antifreezing ionogel-based triboelectric nanogenerator(ITENG)is assembled for efcient energy *** ITENG shows a short circuit current(ISC)of 6.1μA,open circuit voltage(VOC)of 115 V,and instantaneous peak power density of 334 mW m−*** work provides a new strategy to design ionogels for the advancement of wearable electronics.

关键词： Ionogel Electronic skin Self-healing Fiber Sensor Triboelectric nanogenerator

Preparation and Properties of Polyacrylamide/Sodium Alginate Hydrogel and the Effect of Fe^(3+)Adsorption on Its Mechanical Performance

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Journal of Renewable Materials 2021年第8期9卷 1447-1462页

作者： Zheng Cao Yang Zhang Keming Luo Yinqiu Wu Hongxin Gao Junfeng Cheng Chunlin Liu Guoliang Tao qingbao guan Lei Zhang Key Laboratory of High Performance Fibers&Products Ministry of EducationDonghua UniversityShanghai201620China Jiangsu Key Laboratory of Environmentally Friendly Polymeric Materials School of Materials Science and EngineeringJiangsu Collaborative Innovation Center of Photovoltaic Science and EngineeringChangzhou UniversityChangzhou213164China Changzhou University Huaide College Jingjiang214500China National Experimental Demonstration Center for Materials Science and Engineering Changzhou UniversityChangzhou213164China Key Laboratory of Optic-Electric Sensing and Analytical Chemistry for Life Science MOECollege of Chemistry and Molecular EngineeringQingdao University of Science and TechnologyQingdao266042China

The preparation and application of functional hydrogels based on natural polysaccharides have always been a hot research *** this study,using acrylamide(AM)monomer,N,N'-methylene bisacrylamide(MBA)as crosslinking agent,potassium persulfate(K2S2O8)as initiator,in the presence of natural polysaccharide sodium alginate(SA),the PAM/SA hydrogel was prepared by free radical *** transform infrared spectroscopy(FT-IR),swelling performance tests,scanning electron microscope(SEM),thermogravimetric analysis(TGA),UV-visible spectrophotometer,mechanical property measurements were carried out to analyze the composition,morphology,and performance of the *** swelling behavior,dye adsorption performance,and the mechanical properties of PAM/SA hydrogels before and after Fe^(3+)adsorption were *** experimental results showed that the introduction of SA with 4.7%,7.8%,and 10.3%effectively improved the mechanical and dye adsorption properties of PAM composite *** adsorption capacity of PAM/4.7%SA and PAM/10.3%SA hydrogels at equilibrium can reach 40.01 and 44.02 mg/g for methylene blue,which is higher than the value 13.58 mg/g of pure PAM *** compressive strength of pure PAM hydrogel is 0.124 *** the SA content is 4.7%,7.8%,and 10.3%,the compressive strength of the PAM/SA hydrogel was corresponding to 0.130 MPa,0.134 MPa,and 0.152 MPa,***^(3+)was introduced into the PAM/SA hydrogels,and PAM/SA/Fe^(3+)double-network hydrogels with excellent mechanical properties could be prepared by adjusting the SA content(4.7%,7.8%,and 10.3%),soaking time(1 h,2 h,3 h,4 h,5 h,6 h),and Fe^(3+)concentration(4.76%,7.41%,9.09%,and 13.04%).Under the same Fe^(3+)concentration of 9.09%and adsorption time of 4 h,the compressive strengths of the PAM/4.7%SA,PAM/7.8%SA,and PAM/10.3%SA hydrogels could reach 0.354 MPa,0.767 MPa,and 0.778 MPa,respectively.

关键词： Sodium alginate acrylamide hydrogel dye adsorption mechanical properties

Cooperative Chemical Coupling and Physical Lubrication Effects Construct Highly Dynamic Ionic Covalent Adaptable Network for High-Performance Wearable Electronics

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CCS Chemistry 2023年第5期5卷 1096-1107页

作者： Lijie Sun Hongfei Huang qingbao guan Lei Yang Luzhi Zhang Benhui Hu Rasoul Esmaeely Neisiany Zhengwei You Meifang Zhu State Key Laboratory for Modification of Chemical Fibers and Polymer Materials College of Materials Science and EngineeringInstitute of Functional MaterialsResearch Base of Textile Materials for Flexible Electronics and Biomedical Applications(China Textile Engineering Society)Shanghai Engineering Research Center of Nano-Biomaterials and Regenerative MedicineDonghua UniversityShanghai 201620 Key Laboratory of Clinical and Medical Engineering School of Biomedical Engineering and InformaticsNanjing Medical UniversityNanjing 211166 Department of Materials and Polymer Engineering Faculty of EngineeringHakim Sabzevari UniversitySabzevar ***

Covalent adaptable networks(CANs),which combine the benefits of traditional thermosets and thermoplastics,have attracted considerable *** dynamics of reversible covalent bonds and mobility of polymer chains in CANs determine the topological rearrangement of the polymeric network,which is critical to their superior features,such as self-healing and ***,we introduce an ionic liquid to dimethylglyoximeurethane(DOU)-based CANs to regulate both reversible bond dynamics and polymer chain mobility by cooperative chemical coupling and physical ***-molecule model experiments demonstrated that ionic liquids can catalyze dynamic DOU bond *** liquid also breaks the hydrogen bonds between polymeric chains,thereby increasing their *** a combined result,the activation energy of the dissociation of the dynamic network decreased from 110 to 85 kJ mol^(−1).Furthermore,as a functional moiety,the ionic liquid imparts new properties to CANs and will greatly expand their *** example,the consequent conductivity of resultant ionic CAN(iCAN)has demonstrated a great power to build high-performance multifunctional wearable electronics responsive to multiple stimulations including temperature,strain,and *** study provides a new design principle that simultaneously uses the chemical and physical effects of two structural components to regulate material properties enabling novel applications.

关键词： covalent adaptable networks polyurethane self-healing recycling ionic skin

A fluorine-rich phenolic polyurethane elastomer with excellent selfhealability and reprocessability and its applications for wearable electronics

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Science China Materials 2022年第9期65卷 2553-2564页

作者： Yujie Jia qingbao guan Luzhi Zhang Rasoul Esmaeely Neisiany Nina Yan Ya Li Zhengwei You College of Chemistry and Chemical Engineering Shanghai University of Engineering ScienceShanghai 201620China State Key Laboratory for Modification of Chemical Fibers and Polymer Materials College of Materials Science and EngineeringInstitute of Functional MaterialsResearch Base of Textile Materials for Flexible Electronics and Biomedical Applications(China Textile Engineering Society)Shanghai Engineering Research Center of Nano-Biomaterials and Regenerative MedicineDonghua UniversityShanghai 201620China State Key Laboratory of Molecular Engineering of Polymers(Fudan University) Shanghai 200433China Department of Materials and Polymer Engineering Faculty of EngineeringHakim Sabzevari UniversitySabzevar ***Iran Institute of Agricultural Facilities and Equipment Jiangsu Academy of Agricultural SciencesKey Laboratory for Protected Agricultural Engineering in the Middle and Lower Reaches of Yangtze RiverMinistry of Agriculture and Rural AffairsNanjing 210014China

Polyurethane elastomers with covalent adaptable networks(PU-CANs)based on the dynamic urethane bond have attracted remarkable attention owing to their reprocessability,adaptability,and ***,it is still a formidable challenge to achieve excellent dynamics at low temperatures since the urethane bond energy is usually ***,a fluorinated phenolic polyurethane(FPPU)elastomer with CANs based on phenol±carbamate bonds was successfully designed and ***,the effects of fluorine atoms on the mechanical properties,thermal stability,reprocessability,and self-healability,surface free energy,and hydrophobicity of the prepared elastomers were systematically *** FPPU elastomer showed notch-insensitivity,remarkable self-healable efficiency(98%),low dynamic dissociation temperature(60℃),excellent reprocessability,and low surface energy(62 MJ m^(-2))compared with non-fluorinated counterpart phenolic polyurethane elastomer(APPU).Based on the above-mentioned features,FPPU was selected as an elastic substrate to assemble into a triboelectric nanogenerator(TENG)to harvest energy from natural *** TENG exhibited an excellent electrical output performance with a peak open-circuit voltage of 103 V,a peak short-circuit current of 4.7μA and a peak short-circuit charge of 43 *** addition,the TENG possessed high selfcleaning and reprocessing ***,a stretchable and self-healing composite conductor based on FPPU was fabricated for flexible electronic devices.

关键词： fluorinated polyurethane self-healing phenol-carbamate bonds reprocessability triboelectric nanogenerator

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Self-healing materials enable free-standing seamless large-scale 3D printing

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Science China Materials 2021年第7期64卷 1791-1800页

作者： Han Zuo Zenghe Liu Luzhi Zhang Gengxin Liu Xikai Ouyang qingbao guan Qilin Wu Zhengwei You 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 Material Science and EngineeringDonghua UniversityShanghai 201620China Center for Advanced Low-Dimension Materials Donghua UniversityShanghai 201620China

Three-dimensional(3 D)printing has had a large impact on various fields,with fused deposition modeling(FDM)being the most versatile and cost-effective 3 D printing ***,FDM often requires sacrificial support structures,which significantly complicates the processing and increases the ***,poor layer-to-layer adhesion greatly affects the mechanical stability of 3D-printed ***,we present a new Print-Healing strategy to address the aforementioned challenges.A polymer ink(Cu-DOU-CPU)with synergetic triple dynamic bonds was developed to have excellent printability and room-temperature self-healing *** with various shapes were printed using a simple compact 3D printer,and readily assembled into large sophisticated architectures via *** dynamic bonds induce strong binding between ***,damaged printed objects can spontaneously heal,which significantly elongates their service *** work paves a simple and powerful way to solve the key bottlenecks in FDM 3D printing,and will have diverse applications.

关键词： dynamic bonds self-healing 3D printing support-free interlayer adhesion

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