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Strong and Tough PAm/SA Hydrogel with Highly Strain Sensitivity

Journal of Renewable Materials 2022年第2期10卷 415-430页

作者： Lingqin Zhang Qifeng Jiang Yiming Zhao Jie Yuan Xiaoying Zha Haojiang Xie Fankai Kong Xingliang Xiong Department of Medical Information College Chongqing Medical UniversityChongqing400016China

The hydrogel is a preferred material for flexible wearable sensors.In practical application,it should have high-efficiency mechanical toughness and self-healing performance.Besides,hydrogel requires good affinity and adhe-sion because of its contact with the skin.In this experiment,we made an ultra-tough hydrogel with excellent cell affinity and adhesion.We used sodium alginate(SA)and polyacrylamide(PAm)mixture as a flexible base fluid.Polydopamine reduce graphene oxide(prGO)was used as conductive nanofiller,and then PAm-prGO-SA semi-interpenetrating network hydrogel was formed through Am radical polymerization.The presence of prGO endows the hydrogels with excellent electrical conductivity.Simultaneously,some non-reduced GO forms non-covalent cross-links with PAm,SA,and Polydopamine(PDA)in the hydrogel network.The stress of PAm-prGO-SA hydrogel can reach 750 KPa,and the strain is 900%.The hydrogel,combined with its excellent electrical,mechanical properties,and biocompatibility,is expected to be applied in portable,remote,and real-time health monitoring systems.

关键词： Sodium alginate polyacrylamide graphene oxide nanofiller

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Nanomechanical Characteristics of Interfacial Transition Zone in Nano-Engineered Concrete

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Engineering 2022年第10期17卷 99-109页

作者： Xinyue Wang Sufen Dong Zhenming Li Baoguo Han Jinping Ou School of Civil Engineering Dalian University of TechnologyDalian 116024China School of Transportation and Logistics Dalian University of TechnologyDalian 116024China Department of Materials and Environment(Microlab) Faculty of Civil Engineering and GeoscienceDelft University of TechnologyDelft 2628 CNNetherlands

This study investigates the effects of nanofillers on the interfacial transition zone(ITZ)between aggregate and cement paste by using nanoindentation and statistical nanoindentation techniques.Moreover,the underlying mechanisms are revealed through micromechanical modeling.The nanoindentation results indicate that incorporating nanofillers increases the degree of hydration in the ITZ,reduces the content of micropores and low-density calcium silicate hydrate(LD C-S-H),and increases the content of highdensity C-S-H(HD C-S-H)and ultra high-density C-S-H(UHD C-S-H).In particular,a new phase,namely nano-core-induced low-density C-S-H(NCILD C-S-H),with a superior hardness of 2.50 GPa and an indentation modulus similar to those of HD C-S-H or UHD C-S-H was identified in this study.The modeling results revealed that the presence of nanofillers increased the packing density of LD CS-H and significantly enhanced the interaction(adhesion and friction)among the basic building blocks of C-S-H gels owing to the formation of nano-core-shell elements,thereby facilitating the formation of NCILD C-S-H and further improving the performance of the ITZ.This study provides insight into the effects of nano fillers on the ITZ in concrete at the nanoscale.

关键词： Concrete nanofiller Interfacial transition zone Nanoindentation Micromechanical modeling Nano-core effect

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The Influence of Creep on the Mechanical Properties of Calcium Carbonate nanofiller Reinforced Polypropylene

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Journal of Minerals and Materials Characterization and Engineering 2011年第2期10卷 143-159页

作者： Chrisopher Chukwutoo Ihueze Chinedum Ogonna Mgbemena Ugwu Sylveste Department of Industrial / Production Engineering Nnamdi Azikiwe University Awka Department of Mechanical Engineering Nnamdi Azikiwe University Awka Department of Mechanical Engineering University of Nigeria

The study focused on experimental and classical data to establish some mechanical properties for optimum design of new polypropylene components to serve under creep environment. The creep studies recorded stress limits that never exceeded 24.19MPa and maximum creep modulus that never exceeded 1.49GPa as against the predictions of classical equations that gave 2.0GPa for PPC0 and 2.46GPa for PPC2 at ambient conditions. The shear modulus and shear strength of the PPC0 and the PPC2 are predicted as 0.75GPa and 120MPa respectively and 0.92GPa and 150MPa respectively while the yield strengths found to be about 13.19MPa and 13.20MPa respectively for PPC0 and PPC2 at elastic strains 0.008 and 0.009 respectively. Further found are that as the material deforms the stiffness or modulus decrease, at low strains there is an elastic region, as temperature and applied stress increase the material becomes more flexible characterized with reduction in moduli. Plastic deformation at strains above 0.01 resulted to strain- hardening or strain-strengthening that manifested as the increasing area ratios and associated creep cold work. Also established by this study is a computational model for evaluating the elastic modulus of polypropylene matrix based material as expressed in equation (6). Both the Halphin-Tsai and the Birintrup equations for elastic modulus of unidirectional fibre composites were confirmed to be appropriate for prediction of elastic modulus of nanofiller composites with polymer matrix.

关键词： Influence of creep Mechanical properties Calcium carbonate nanofiller ReinforcedPolypropylene.

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Some basic aspects of polymer nanocomposites: A critical review

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Nano Materials Science 2019年第1期1卷 2-30页

作者： Shaoyun Fu Zheng Sun Pei Huang Yuanqing Li Ning Hu College of Aerospace Engineering Chongqing University

Polymer nanocomposites have been investigated for about three decades. To get deep insights into the modifying effects of various nanofillers on mechanical and physical properties of polymer nanocomposites, the three basic aspects of processing, characterization and properties are critically reviewed in this paper. nanofillers can be classified into three major types of two-dimensional (2D) layered, one-dimensional (1D) fibrous and zerodimensional (0D) spherical ones and this review thus discusses in detail the processing, characterization and properties of the three types of polymer nanocomposites. It starts with an introduction of various nanoscale fillers such as two-dimensional (2D) nano-clay, graphene and MXene, one dimensional (1D) carbon nanofibers and nanotubes, zero dimensional (0D) silica nanoparticles and ZnO quantum dots as well as nanofiller-polymer interfaces. The processing of these polymer nanocomposites using different methods and the characterization of nanofillers and polymer nanocomposites using various techniques are described. Finally, the mechanical and physical properties of these polymer nanocomposites are discussed by considering the effects of nanofiller type, dispersion and contents;also, interface properties show significant effects on the mechanical properties of polymer nanocomposites and are discussed in some details.

关键词： Polymer nanocomposite nanofiller Processing Characterization Mechanical and physical properties

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Influence of Temperature and Atmospheric Components on UV Curing Acrylates and Epoxides

Influence of Temperature and Atmospheric Components on UV Cu...

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第三届世界粘接及相关现象大会暨北京粘接学会第十五届学术...

作者： Matthias Popp Andreas Hartwig Katharina Teczyk Fraunhofer-Institut IFAM Wiener Strasse 1228359 Bremen

＜正＞UV curing of adhesives and coatings is usually accompanied by a considerable input of heat due to IR irradiation of the lamps.For a short time new irradiation devices with "cold" UV light of high intensity are available,which enable the curing of UV curing systems without thermal impact.It will be shown which properties of photochemically cured adhesives and coatings are affected by the curing heat.These properties are for example:degree of cross-linking,shrinkage, hardness and storage modulus.Furthermore the influence of humidity and atmospheric composition on the curing rate and properties of acrylic and cationic curing epoxy resins is presented.

关键词： UV curing acrylates epoxides nanofiller

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