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Investigation of functional,physical,mechanical and thermal properties of TiO2 embedded polyester hybrid composites:A design of experiment(DoE)study

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Progress in Natural Science:Materials International 2018年第3期28卷 266-274页

作者： Muhammad Azeem Munawar dirk wolfram schubert Shahzad Maqsood Khan Muhammad Atiq Ur Rehman Nafisa Gulld Atif Islam Aneela Sabir Muhammad Shafiq Bilal Haider Mudassar Azam Saba Urooge Khan Monika M.Voigt Institute of Polymer Materials Friedrich-Alexander-University Department of Polymer Engineering and Technology University of the Punjab Bavarian Polymer Institute Institute of Biomaterials Friedrich-Alexander-University Institute of Chemical Engineering and Technology University of the Punjab

This paper presents a study on the Design of Experiments(Do E) approach to optimize the fabrication parameters of titania(TiO2) embedded glass fiber reinforced polyester hybrid composites(HCs). HCs of unsaturated polyester resin(UPR) were fabricated using methyl ethyl ketone peroxide(MEKP) as the curing agent by hand lay-up process(HLUP) and compression molding technique(CMT). The fabrication parameters were optimized by Taguchi Do E(an orthogonal array of L25) using 3 control factors(concentration of TiO2, concentration of MEKP and curing temperature) having 5 levels each. Statistical tools were employed to identify significant factors affecting tensile strengths and its reproducibility during HLUP. It was found that the concentration of TiO2in HCs significantly influenced the tensile strength(TS) followed by MEKP concentration and curing temperature. The highest value of TS was obtained at 3 wt% TiO2, 2 wt% MEKP and 80 °C. Nevertheless, the sensitivity of TiO2concentration was basis for fabrication of polyester titania glass fiber hybrids(PTGFHs), which were further investigated for density and void fractions, linear shrinkage, flexural strength, impact strength, hardness and thermal behaviors. Moreover, cross-linking and hydrogen-bonding between polymeric chains, styrene, silica content of glass fiber and TiO2particles in PTGFHs were confirmed by Fourier transform infrared spectroscopy.

关键词： Hybrid composites Polyester Design of experiment Titania

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Experimental and Theoretical Study on Piezoresistive Behavior of Compressible Melamine Sponge Modified by Carbon-based Fillers

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Chinese Journal of Polymer Science 2022年第11期40卷 1503-1512页

作者： Xiao-Ling Luo dirk W.schubert Institute of Polymer Materials Friedrich-Alexander-University Erlangen-NurembergMartensstr.7Erlangen91058Germany KeyLab Advanced Fiber Technology Bavarian Polymer InstituteDr.Mack-Strasse 77Fürth90762Germany

High-performance compression sensors have been playing an increasingly important role in human motion detection,health monitoring and human-machine interfaces over recent ***,it remains a great challenge to develop theoretical models providing practical guidance to the sensor ***,carbon black(CB),carbon nanotubes(CNTs)and graphene nanoplatelets(GNPs)were respectively incorporated into porous melamine sponges by a facile approach of dip-coating to fabricate compression *** compression-resistance tests show that the compressibility,stability and piezoresistive sensitivity of sensors could be tailored by the filler type and concentration.A model considering the number of conductive pathways(NCP)is given to describe the relationship between the resistance change and applied compression,showing extremely good agreement with the experimental ***,the correlation between the equivalent filler volume fraction and conductivity is described by the other two models proposed by McLachlan and Kirkpatrick,revealing the electrical percolation thresholds(Φc)for the conductive systems under *** the three fillers,CB particles endowed the composite with the best piezoresistive sensitivity but the largestΦc due to its small size and aspect ratio.A combination of experimental study and theoretical model opens up a way of further understanding the piezoresistive sensing behavior as well as optimizing the electrical property and piezoresistivity of compressive conductive polymer composite.

关键词： Compression sensor Melamine sponge Model Piezoresistivity

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Ni Flower/MXene-Melamine Foam Derived 3D Magnetic/Conductive Networks for Ultra-Efficient Microwave Absorption and Infrared Stealth

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Nano-Micro Letters 2022年第4期14卷 142-157页

作者： Haoran Cheng Yamin Pan Xin Wang Chuntai Liu Changyu Shen dirk W.schubert Zhanhu Guo Xianhu Liu Key Laboratory of Advanced Material Processing&Mold(Ministry of Education) National Engineering Research Center for Advanced Polymer Processing TechnologyCollege of Materials Science and EngineeringZhengzhou UniversityZhengzhou 450002People’s Republic of China Institute of Polymer Materials Friedrich-Alexander-University Erlangen-NurembergMartensstr.791058 ErlangenGermany Integrated Composites Laboratory(ICL) Department of Chemical&Biomolecular EngineeringUniversity of TennesseeKnoxvilleTN 37996USA

The development of multifunctional and efficient electromagnetic wave absorbing materials is a challenging research ***,the magnetized Ni flower/MXene hybrids are successfully assembled on the surface of melamine foam(MF)through electrostatic self-assembly and dip-coating adsorption process,realizing the integration of microwave absorption,infrared stealth,and flame ***,the Ni/MXene-MF achieves a minimum reflection loss(RLmin)of−62.7 dB with a corresponding effective absorption bandwidth(EAB)of 6.24 GHz at 2 mm and an EAB of 6.88 GHz at 1.8 *** electromagnetic wave absorption is attributed to the three-dimensional magnetic/conductive networks,which provided excellent impedance matching,dielectric loss,magnetic loss,interface polarization,and multiple *** addition,the Ni/MXene-MF endows low density,excellent heat insulation,infrared stealth,and flame-retardant *** work provided a new development strategy for the design of multifunctional and efficient electromagnetic wave absorbing materials.

关键词： Ni-MXene/Melamine foam Microwave absorption Heat insulation Infrared stealth Flame-retardant

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Highly Sensitive Ultrathin Flexible Thermoplastic Polyurethane/Carbon Black Fibrous Film Strain Sensor with Adjustable Scaffold Networks

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Nano-Micro Letters 2021年第4期13卷 159-177页

作者： Xin Wang Xianhu Liu dirk W.schubert Institute of Polymer Materials Friedrich-Alexander-University Erlangen-NurembergMartensstr.791058 ErlangenGermany National Engineering Research Center for Advanced Polymer Processing Technology Zhengzhou UniversityZhengzhou 450002People’s Republic of China Bavarian Polymer Institute Dr.Mack‑Strasse 7790762 FürthGermany

In recently years,high-performance wearable strain sensors have attracted great attention in academic and ***,a conductive polymer composite of electrospun thermoplastic polyurethane(TPU)fibrous film matrix-embedded carbon black(CB)particles with adjustable scaffold network was fabricated for high-sensitive strain *** work indicated the influence of stereoscopic scaffold network structure built under various rotating speeds of collection device in electrospinning process on the electrical response of TPU/CB strain *** structure makes the sensor exhibit combined characters of high sensitivity under stretching strain(gauge factor of 8962.7 at 155%strain),fast response time(60 ms),outstanding stability and durability(>10,000 cycles)and a widely workable stretching range(0–160%).This high-performance,wearable,flexible strain sensor has a broad vision of application such as intelligent terminals,electrical skins,voice measurement and human motion ***,a theoretical approach was used to analyze mechanical property and a model based on tunneling theory was modified to describe the relative change of resistance upon the applied ***,two equations based from this model were first proposed and offered an effective but simple approach to analyze the change of number of conductive paths and distance of adjacent conductive particles.

关键词： Strain sensor Electrospinning Electronic skin Fitting model

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Correction to: Ni Flower/MXene-Melamine Foam Derived 3D Magnetic/Conductive Networks for Ultra-Efficient Microwave Absorption and Infrared Stealth

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Nano-Micro Letters 2022年第7期14卷 177-178页

The original version of this article unfortunately contained some *** corrections are updated as follows:Error 1:We found that Equations 3,4 and 6 were wrong in the published paper:Error 2:In the page 7,“Since N Ni/MXene-MF possessed numer-ous heterogeneous interfaces and abundant functional groups,the dielectric loss mechanism was explored.”

关键词： Infrared correction dielectric

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Conductivity of Poly(methyl methacrylate)/Polystyrene/Carbon Black and Poly(ethyl methacrylate)/Polystyrene/Carbon Black Ternary Composite Films

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Chinese Journal of Polymer Science 2020年第3期38卷 288-297,I0007页

作者： Hua-Gen Xu Mu-Chao Qu Ya-Min Pan dirk Wschubert Institute of Polymer Materials Friedrich-Alexander-University Erlangen-NurembergMartensstr.791058 ErlangenGermany College of Materials Science and Engineering The Key Laboratory of Material Processing and Mold of Ministry of EducationZhengzhou UniversityZhengzhou 450002China Bavarian Polymer Institute Dr.Mack-Strasse 7790762 FiirthGermany

Poly(methyl methacrylate)(PMMA)/polystyrene(PS)/carbon black(CB)and poly(ethyl methacrylate)(PEMA)/PS/CB ternary composite films were obtained using solution casting technique to investigate double percolation *** both PMMA/PS/CB and PEMA/PS/CB ternary composite films,the CB particles prefer to locate into PS phase based on the results of calculating wetting coefficient,which is also confirmed by SEM *** conductivity of the films was investigated,and the percolation threshold(￠c)of both ternary composite films with different polymer blend ratios was determined by fitting the McLachlan GEM *** of PMMA/PS/CB ternary composite films showed a typical double percolation ***,due to the double emulsion structure of PEMA/PS polymer blends,the PEMA/PS/CB ternary composite films(PEMA/PS=50/50)showed a higher￠c,even CB only located in PS phase,which conflicts with the double percolation effect.A schematic diagram combined with SEM images was proposed to explain this phenomenon.

关键词： Double percolation effect Conductivity Ternary composite films Compatibility

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Incorporation of bioactive glass nanoparticles in electrospun PCL/chitosan fibers by using benign solvents

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Bioactive Materials 2018年第1期3卷 55-63页

作者： Liliana Liverani Jonas Lacina Judith A.Roether Elena Boccardi Manuela S.Killian Patrik Schmuki dirk W.schubert Aldo R.Boccaccini Institute of Biomaterials Department of Materials Science and EngineeringUniversity of Erlangen-NurembergCauerstr.691058 ErlangenGermany Institute of Polymeric Materials Department of Materials Science and EngineeringUniversity of Erlangen-NurembergMartensstrasse 791058 ErlangenGermany LKO Department of Materials Science and EngineeringUniversity of Erlangen-NurembergMartensstrasse 791058 ErlangenGermany Department of Chemistry King Abdulaziz UniversityJeddahSaudi Arabia

The use of bioactive glass(BG)particles as a filler for the development of composite electrospun fibers has already been widely reported and *** novelty of the present research work is represented by the use of benign solvents(like acetic acid and formic acid)for electrospinning of composite fibers containing BG particles,by using a blend of PCL and *** this work,different BG particle sizes were investigated,namely nanosized and micron-sized.A preliminary investigation about the possible alteration of BG particles in the electrospinning solvents was performed using SEM *** obtained composite fibers were investigated in terms of morphological,chemical and mechanical *** in vitro mineralization assay in simulated body fluid(SBF)was performed to investigate the capability of the composite electrospun fibers to induce the formation of hydroxycarbonate apatite(HCA).

关键词： Green electrospinning Benign solvents Bioactive glass Composite PCL Chitosan Nanofibers

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Universal and Anisotropic Simulation Platform for the Study of Electrical Properties of Conductive Polymer Composites

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材料科学与工程（中英文B版） 2017年第6期7卷 252-257页

作者： Guanda Yang Muchao Qu Fritj of Nilsson dirk W. schubert Institute of Polymer Materials Friedrich-A lexander-University Erlangen-Nuremberg Erlangen 91058 Germany KTH Royal Institute of Technology School of Chemical Science and Engineering Fibre and Polymer Technology SE 10044Stockholm Sweden

In order to carry out a study on the synergistic relationship of variables which could affect the electrical properties of CPC, a universal and anisotropic platform of simulation, containing three simulation modules is explored. The simulation modules are: FEM (finite element modeling), PTM (percolation threshold modeling) and ENM (electrical networks modeling).

关键词：模拟模块各向异性通用性质聚合物传导性学习站台

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纳米二氧化硅对PLA/PMMA共混物链缠结和流变性的影响

纳米二氧化硅对PLA/PMMA共混物链缠结和流变性的影响

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中国化学会第30届学术年会-第十七分会：流变学

作者：郝晓琼 Joachim Kaschta dirk W.schubert 于德梅 Institute of Polymer Materials Department of Materials ScienceUniversity Erlangen-Nuremberg 西安交通大学理学院应用化学系

在高分子材料中引入纳米颗粒不仅能够影响材料的机械性能,而且能显著改变材料加工过程中的流变性能。尤其对于高分子共混物,纳米颗粒还能够引起混合物相结构的改变。我们按照不同的质量百分比将未经处理的纳米二氧化硅(SiO)颗粒通过熔... 详细信息

在高分子材料中引入纳米颗粒不仅能够影响材料的机械性能,而且能显著改变材料加工过程中的流变性能。尤其对于高分子共混物,纳米颗粒还能够引起混合物相结构的改变。我们按照不同的质量百分比将未经处理的纳米二氧化硅(SiO)颗粒通过熔融共混的方法引入到相容的PLA/PMMA 50/50的共混物中。研究发现随着二氧化硅颗粒的加入,不仅共混物的玻璃化转变温度得到提高,而且其玻璃化转变区间也变大。扫描电镜(SEM)结果显示SiO增强的PLA/PMMA混合物的界面存在明显的"坑状"结构。根据对PLA/SiO,PMMA/SiO以及PLA/PMMA/SiO三种纳米复合材料的SEM和流变学实验结果的综合分析,我们认为PLA分子链能够选择性吸附在纳米二氧化硅颗粒周围,引起PLA/PMMA混合物在纳米尺度的局部非均质分布。此外,流变实验表明纳米二氧化硅的引入提高了PLA/PMMA共混物在熔融状态下的粘弹性以及相稳定性,并且提高了共混物中的链缠结点密度。

关键词：纳米颗粒流变性链缠结选择性吸附

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汉堡港岸地区的转型过程

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国外城市规划 2006年第1期21卷 1-11页

作者： dirk schubert 干靓汉堡-哈尔堡技术大学同济大学建筑与城市规划学院城市发展战略与管理研究院

本文首先分析了海港城市结构变化的背景,介绍了城市开发宏观背景下的汉堡港开发。随后描述了汉堡重要的用途置换计划“珍珠项链(Perlenkette)”、哈尔堡内河港、港口城市以及“跨越易北河”,最终将这些项目在港口/城市开发的框架中定位。

关键词：汉堡港易北河结构转型

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