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Dielectric and electrical properties of Na_(2)Pb_(2)La_(2)W_(2)Ti_(4)Ta_(4)O_(30) electroceramics

Journal of Advanced Ceramics 2012年第3期1卷 232-240页

作者： P.R.DAS S.BEHERA R.PADHEE P.NAYAK R.N.P.CHOUDHARY Department of Physics Institute of Technical Education&ResearchSiksha‘O’Anusandhan UniversityBhubaneswar-751030OdishaIndia Department of Physics Hi-tech College EngineeringBhubaneswar-75102OdishaIndia School of Physics Sambalpur UniversityJyoti ViharBurla-768019OdishaIndia

The polycrystalline sample of complex tungsten-bronze type compound(Na_(2)Pb_(2)La_(2)W_(2)Ti_(4)Ta_(4)O_(30))was prepared by a high-temperature solid-state reaction *** temperature preliminary structural study using X-ray diffraction(XRD)data exhibits the formation of a single-phase new *** SEM micrograph of the compound exhibits non uniform rectangular grains distributed throughout the sample *** studies of dielectric parameters(εr,tanδ)as a function of temperature and frequency,and P-E hysteresis(spontaneous polarization)confirmed the existence of ferroelectricity in the *** impedance spectroscopy analysis,carried out as a function of frequency at different temperatures,established a correlation between the microstructure and electrical properties of the *** electrical relaxation process occurring in the material is temperature *** activation energy found from the Arrhenius plot that the conduction process in the material is of mixed *** nature of frequency dependence of ac conductivity suggests that the material obeys Jonscher’s universal power law.

关键词： electronic material ferroelectricity XRD electrical conductivity

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Review:Progress in Core-shell Rubber Particles for Efficiently Toughening Resins

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Journal of Harbin Institute of Technology(New Series) 2022年第6期29卷 34-63页

作者： Xin-Gui Li Xiong Wang Mei-Rong Huang Yue-Shan He Fei Liu Wei-Hong Xu State Key Laboratory of Pollution Control and Resource Reuse College of Environmental Science and EngineeringTongji UniversityShanghai 200092China Key Laboratory of Advanced Civil Engineering materials of Ministry of Education College of Materials Science and EngineeringTongji UniversityShanghai 200092China Shenzhen Newfilms New materials Technology Co. LtdShenzhen 518106GuangdongChina

Core-shell toughening particles are structured composite particles consisting of generally two different components, one at the center as a rubbery elastic core and surrounding by the second as a glassy inelastic shell. The design, preparation, and application of core-shell polymer particles have been briefly reviewed. Morphological characteristics of the core-shell particles by transmission electron microscopy(TEM) and scanning electron microscopy(SEM) are focused. The vital factors that are useful to control core-shell morphology and toughening properties including core-shell monomer species, polymerization conditions, cross-linking reagents, synthetic method, and post-processing techniques are analyzed. Distinguished properties are mainly considered as the most desirable features that endow core-shell polymer particles with various applicabilities, particularly as effectively toughening components in brittle epoxy resin and polylactide that are substrate of copper clad laminate widely used in the modern electronic world and environmentally friendly materials that are useful as packaging films, disposable tableware, biomedical equipment, and new energy vehicles.

关键词： core-shell particle rubbery core glassy shell brittle resin toughening epoxy resin electronic material

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