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self-reinforcement of Light, Temperature-Resistant Silica Nanofibrous Aerogels with Tunable Mechanical Properties

Advanced Fiber Materials 2020年第6期2卷 338-347页

作者： Tao Huang Yue Zhu Jie Zhu Hao Yu Qinghua Zhang Meifang Zhu Key Laboratory of High Performance Fibers and Products Ministry of EducationDonghua UniversityShanghai 201620People’s Republic of China State Key Laboratory for Modification of Chemical Fibers and Polymer Materials College of Materials Science and EngineeringDonghua UniversityShanghai 201620People’s Republic of China

Silica aerogels have attracted significant interest in thermal insulation applications because of their low thermal conductivity and great thermal stability,however,their fragility has limited their application in every-day ***,a self-reinforcing strategy to design silica nanofibrous aerogels(SNFAs)is proposed using electrospun SiO2 nanofibers as the matrix and a silica sol as a high-temperature *** this approach results in a strong and compatible interfacial interaction between the SiO_(2) fibers and the silica sol,which results in the SNFAs exhibiting high-temperature-resistant and tunable mechanical properties from elastic to ***,additional properties such as low density,high thermal insulation performance,and fire-resistance are still *** self-reinforcing method described herein may be extended to numerous other new ceramic aerogels that require robust mechanical properties and high-temperature resistance.

关键词： Nanofiber aerogel Silica Electrospinning self-reinforcement

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Effect of Point Source, self-reinforcement and Heterogeneity on the Propagation of Magnetoelastic Shear Wave

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Applied Mathematics 2011年第3期2卷 271-282页

作者： Amares Chattopadhyay Shishir Gupta Abhishek K. Singh Sanjeev A. Sahu 不详

This paper investigates the propagation of horizontally polarised shear waves due to a point source in a magnetoelastic self-reinforced layer lying over a heterogeneous self-reinforced half-space. The heterogeneity is caused by consideration of quadratic variation in rigidity. The methodology employed combines an efficient derivation for Green’s functions based on algebraic transformations with the perturbation approach. Dispersion equation has been obtained in the closed form. The dispersion curves are compared for different values of magnetoelastic coupling parameters and inhomogeneity parameters. Also, the comparative study is being made through graphs to find the effect of reinforcement over the reinforced-free case on the phase velocity. It is observed that the dispersion equation is in assertion with the classical Love-type wave equation in the absence of reinforcement, magnetic field and heterogeneity. Moreover, some important peculiarities have been observed in graphs.

关键词： Shear Wave Magnetoelastic self-reinforcement Dispersion Equation Seismic Wave

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PREPARATION AND PROPERTIES OF HIGH STRENGTH RODS FROM L-AND D,L-LACTIDE COPOLYMER

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Chinese Journal of Polymer Science 2001年第4期19卷 351-357页

作者： Yu-shan Hu Zheng-pu Zhang Dong Song Dong-ren Bai Yong-mei Wang Institute of Polymer Chemistry State Key Laboratory of Functional Polymeric Materials for Adsorption and Separation, Nankai University Tianjin 300071, China Institute of Polymer Chemistry Stt. Key Lab. Funct. Polymeric M. Nankai University Tianjin 300071 China

Starling with the L- and D,L-lactide copolymer (L:DL = 9:1) [P(L-DL)LA] of M-W = 32.1 x 10(4), rods were obtained through a two stage process: (1) melt-extrusion at 155 degreesC, and (2) hot-drawing at 90 degreesC to various drawing ratios. The molecular weight of P(L-DL)LA fell to 9.3 x 10(4) as a consequence of the production process. The crystallization and molecular orientation of P(L-DL)LA developed as a result of the hot-drawing. The mechanical strengths of the rods increase with the drawing ratio; The maximum for tensile strength, bending strength, bending modulus, and shear strength are 329 MPa, 237 MPa, 8.8 GPa, and 157 MPa, respectively.

关键词： P(L-DL)LA self-reinforcement rod process bone fracture fixation

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Infuence of Composition on self-toughening and Oxidation Properties of Y-a-Sialons

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Journal of Materials Science & Technology 2013年第10期29卷 983-988页

作者： Chunfeng Liu Feng Ye Rongsen Xia Lei Zhang Yu Zhou Yudong Huang Institute for Advanced Ceramics School of Materials Science and EngineeringHarbin Institute of Technology School of Chemical Engineering and Technology Harbin Institute of Technology

Y-α-sialon ceramics with different compositions were hot-press sintered. Varying the m or n value in theα-Sialon general formula, both the α-sialon grain morphology and phase assemblages present diversification, therefore, affecting the toughness and hardness. Meanwhile, varying the compositional parameters also influenced the composition and structure of the intergranular glass phase, as well as its oxidation behavior at 1100-1200 ℃. The oxidation of the intergranular phase Mt in the Y-α-sialon ceramics was significantly enhanced with further rising the oxidation temperature to 1300 ℃.

关键词： α-Sialon ceramics Oxidation Y203 self-reinforcement

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高分子-锂藻土纳米复合水凝胶的非线性力学行为

高分子-锂藻土纳米复合水凝胶的非线性力学行为

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2014年全国高分子材料科学与工程研讨会

作者：王涛练翠霞孙尉翔刘新星童真华南理工大学材料科学与工程学院

＜正＞锂藻土（hectorite）是人工合成的层状粘土,在水中可分散成直径约30nm、厚1nm的粒子,表面带有很多负电荷,边缘带少量正电荷。丙烯酰胺类单体在锂藻土分散液中原位聚合,可以得到力学性能优异的纳米复合水凝胶（NC凝胶）。强度可达... 详细信息

＜正＞锂藻土（hectorite）是人工合成的层状粘土,在水中可分散成直径约30nm、厚1nm的粒子,表面带有很多负电荷,边缘带少量正电荷。丙烯酰胺类单体在锂藻土分散液中原位聚合,可以得到力学性能优异的纳米复合水凝胶（NC凝胶）。强度可达MPa级,断裂伸长也可超过1000%,透光率高于90%,具有良好的生物相容性;通过与功能性单体共聚还能具有环境响应功能。因此,NC凝胶在柔性驱动器、生物医用材料等领域有着诱人的应用前景。由于传

关键词： strain hardening self-reinforcement hysteresis notch-insensitive self-healing

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