LDPE/SiO_x纳米复合材料的制备及电性能研究

采用正交试验通过硅溶胶母料法制备低密度聚乙烯/纳米氧化硅(LDPE/nano SiOx)复合材料,研究乙烯-醋酸乙烯共聚物(EVA)、SiOx含量和分散剂种类对复合材料电性能的影响。通过体积电阻率实验、击穿场强实验和树枝放电实验进行测试和分析,结果表明,对复合材料综合性能影响的主次顺序是EVA含量与分散剂种类的影响相差不大,均大于SiOx含量的影响;综合性能好的复合材料的合适配方为:EVA3%(质量分数),SiOx1%(质量分数),分散剂为聚乙二醇200。     

Preparation of oxygen gas barrier poly(ethylene terephthalate) films by deposition of silicon oxide films plasma‐polymerized from a mixture of tetramethoxysilane and oxygen

To prepare silicon oxide (SiOx)‐deposited poly(ethylene terephthalate) films with high oxygen gas barrier capability, SiOx deposition by plasma polymerization has been investigated from the viewpoint of chemical composition. Tetramethoxysilane (TMOS) is suitable as a starting material for the synthesis of the SiOx films. The SiOx deposition under self‐bias, where the etching action occurs around an electrode surface, is effective in eliminating carbonaceous compounds from the deposited SiOx films. There is no difference in the chemical composition between the SiOx films deposited under self‐bias and under no self‐bias. The SiOx films are composed of a main component of Si O Si networks and a minor component of carbonized carbons. The SiOx films deposited under no self‐bias from the TMOS/O₂ mixture show good oxygen gas barrier capability, but the SiOx films deposited under the self‐bias show poor capability. The minimum oxygen permeation rate for poly(ethylene terephthalate) films deposited SiOx film is 0.10 cm³ m⁻² day⁻¹ atm⁻¹, which corresponds to an oxygen permeability coefficient of 1.4 × 10⁻¹⁷ cm³‐cm cm⁻² s⁻¹ cm⁻¹ Hg for the SiOx film itself. © 1999 John Wiley & Sons, Inc. J Appl Polym Sci 71: 2091–2100, 1999     

Deposition of silicon oxide hard coatings by low‐temperature radio‐frequency plasmas

In this study, the deposition of silicon oxide (SiOx) hard coatings on polycarbonate (PC) substrates was attempted with low‐temperature radio‐frequency (RF) plasmas from tetramethyldisiloxane (TMDSO) with the addition of oxygen. The coating uniformity and deposition rate were investigated in terms of substrate size, glow uniformity, and RF power input. The hardness of the resulting SiOx plasma coatings was examined by the ASTM pencil hardness test method. The hardness of the resulting SiOx plasma coatings was mainly determined by the TMDSO–O₂ ratio in the plasma gas mixture. Ultraviolet–visible transmission spectra showed that these plasma coatings were transparent in the visible light region. Fourier transform infrared–attenuated total reflection analysis results indicated that the resulting SiOx plasma coatings were inorganic in nature. The interfacial adhesion, which is a common problem in the deposition of hard protective coatings on polymeric substrates, was also significantly improved by the deposition of an ultrathin plasma polymer interlayer from TMDSO before the deposition of the SiOx plasma coatings on the PC substrates. © 2009 Wiley Periodicals, Inc. J Appl Polym Sci, 2010     

Preparation of Aligned Ultra-long and Diameter-controlled Silicon Oxide Nanotubes by Plasma Enhanced Chemical Vapor Deposition Using Electrospun PVP Nanofiber Template

Well-aligned and suspended polyvinyl pyrrolidone (PVP) nanofibers with 8 mm in length were obtained by electrospinning. Using the aligned suspended PVP nanofibers array as template, aligned ultra-long silicon oxide (SiOx) nanotubes with very high aspect ratios have been prepared by plasma-enhanced chemical vapor deposition (PECVD) process. The inner diameter (20-200 nm) and wall thickness (12-90 nm) of tubes were controlled, respectively, by baking the electrospun nanofibers and by coating time without sacrificing the orientation degree and the length of arrays. The micro-PL spectrum of SiOx nanotubes shows a strong blue-green emission with a peak at about 514 nm accompanied by two shoulders around 415 and 624 nm. The blue-green emission is caused by the defects in the nanotubes.     

Influence of Low-Temperature Annealing on the Electrical Conductivity of SiOx Films

Silicon - In this paper, the results on the conductivity of silicon enriched SiOx films and the influence of low temperature annealing at 450 °C in the H2 and vacuum are presented....     

Preparation of oxygen gas barrier polypropylene films by deposition of SiOx films plasma‐polymerized from mixture of tetramethoxysilane and oxygen

Silicon oxide (SiOx) film deposition on the surface of oriented poly(propylene) (OPP) films was done to form a new oxygen gas barrier material using plasma polymerization of the tetramethoxysilane (TMOS)/O₂ mixture. The SiOx film deposition on OPP films never improved oxygen gas barrier properties. The inefficacy of the SiOx deposition was due to poor adhesion at the interface between the deposited SiOx and OPP films and also to the formation of cracks in the deposited SiOx film. If prior to the SiOx film deposition surface modification of OPP films was done by a combination of the argon plasma treatment and TMOS coupling treatment, this contributed effectively to strong adhesion leading to success in the SiOx deposition on the OPP film surface, and then the oxygen gas barrier ability was improved. The oxygen permeation rate through the SiOx‐deposited OPP film was decreased from 2230 to 37–52 cm³/m²/day/atm, which was comparable to that of poly(vinylidene chloride), 55 cm³/m²/day/atm at a film thickness of 11 μm. © 2000 John Wiley & Sons, Inc. J Appl Polym Sci 78: 2389–2397, 2000     

PET表面镀SiO_x薄膜的研究进展及应用

综述了采用磁控溅射技术和等离子体增强化学气相沉积技术制备SiOx/聚对苯二甲酸乙二醇酯(PET)薄膜的研究进展,探讨了SiOx/PET薄膜阻隔作用机理,此外还阐述了SiOx/PET薄膜的应用状况。     

Synthesis of photoluminescent SiC-SiOx nanowires using coal tar pitch as carbon source

SiC-SiOx nanowires (NWs) with core-shell and chain-bead structures were synthesized via a catalyst-free chemical vapor deposition (CVD) route without Ar gas, using silicon and coal tar pitch powders as raw materials. The SiC-SiOx NWs with sharp tips formed by solid-vapor between Si (s) and CO (g) or C (s) and SiO (g), liquid-vapor between Si (l) and CO (g), and vapor-vapor between SiO (g) and CO (g) growth process along the [111] direction. The NWs were several millimeters in length, and the average diameters of the chains and beads were 40–90 nm and 325 nm, respectively. The obtained NWs had good blue-green photoluminescence property owing to the stacking faults and amorphous SiOx. This novel CVD route is simple, low cost and suitable for large-scale production.     

纳米SiOx改性PP/POE复合材料冲击性能的研究

研究了纳米氧化硅（SiOx）的添加量和混合工艺对PP／POE改性效果的影响。结果表明，添加少量的纳米SiOx后，复合材料的冲击强度和硬度等性能有明显提高；在共混工艺中，湿法球磨法明显优于干法共混法。     

Innovative Utilization of Improved n-doped μc-SiOx:H Films to Amplify the Performance of Micromorph Solar Cells

Silicon - Due to in-situ deposition process doped SiOx material attracts the PV community as intermediate reflecting layer (IRL) for the less hazardous deposition process. Previously we have been...     

烷基化聚乙烯亚胺接枝SiO_x抗菌剂用于聚乙烯的性能

以纳米SiOx粉体为载体,通过共价接枝修饰,制备出烷基化聚乙烯亚胺接枝SiOx纳米抗菌剂,将其添加到高聚物中制备出抗菌聚乙烯(PE)塑料。实验结果表明:纳米SiOx粉体已经成功接枝上了有机高分子基团,添加3%这种抗菌剂制备的抗菌PE塑料对大肠杆菌和金黄色葡萄球菌的抗菌率都大于96%,达到了强抗菌效果,并且制备的抗菌PE塑料具有良好的抗菌长效性。     

低阻高透柔性导电膜制作技术

介绍低阻高透柔性导电膜膜层结构以及膜层厚度配比,根据物质的理化性能(附着力、光学性能、电学性能等)进行搭配,导电层由ITO/Ag/ITO膜层组成,在导电层和柔性基底之间引入折射率膜层SiO_x,PET基材经过等离子设备预处理后,工艺室的阴极依次镀制SiO_X、ITO、Ag、ITO等膜系。按照控制变量法,通过对导电层以及折射层膜厚设计,经工艺调整得到市场所需指标产品。     

Rational design of coaxial MWCNTs@Si/SiOx@C nanocomposites as extending-life anode materials for lithium-ion batteries

One-dimensional (1D) uniform multi-walled carbon nanotubes (MWCNTs)@Si/SiOx@C nanocomposites were prepared by the magnesiothermic reduction of MWCNT@SiO₂ nanocables and subsequent carbon coating process. Through simply altering the acid-treatment conditions, SiOx were reserved on the surface of MWCNTs to seal and fix the Si nanoparticles, along with the carbon coating layer, the reducted Si nanoparticles (Si NPs) were entirely encapsulated in the 1D coaxial nanocomposites. Due to the multiple volume expansion limit effects of inner Si nanoparticles, the cycling stability has been greatly improved. When worked as anodes for lithium-ion batteries, the MWCNTs@Si/SiOx@C electrode exhibits better electrochemical properties than bulk Si and MWCNTs, as well as an extending cycle life of 500 cycles in comparsion to our previous MWCNTs@Si nanocomposites. It is believed that the MWCNTs can provide structural support and enhance the electronic mobility, while the SiOx and carbon buffer component would anchor the Si NPs firmly and accommodate the volume expansion of Si.     

Fe2O3/N-doped carbon-modified SiOx particles via ionic liquid as anode materials for Li-ion batteries

Journal of Applied Electrochemistry - SiOx is considered a promising alternative anode material for Li-ion batteries because of its higher theoretical capacity and safety compared with those of...     

Plasma polymer deposition from mixture of tetramethoxysilane and oxygen on PET films and their oxygen gas barrier properties

Plasma polymerization of silane compounds has been discussed for deposition of SiOx positron emission tomography (PET) films at room temperature. A mixture of tetramethoxysilane (TMOS) and oxygen containing 60 mol % O₂ is a preferable raw material for SiOx formation by plasma polymerization. The deposited plasma polymers consist mainly of Si(SINGLE BOND)O networks with small amount of Si(SINGLE BOND)OH and Si(SINGLE BOND)C groups. A part of Si(SINGLE BOND)O networks in the plasma polymers is distorted by the Si(SINGLE BOND)OH and Si(SINGLE BOND)C groups. The oxygen permeability coefficient for the plasma polymer itself is 2.1 × 10⁻¹⁵ (STP) cm³/cm/cm²/s/cm Hg, which is lower than that for hydrolyzed ethylene-vinylacetate copolymer (Eval) and poly(vinylidene chloride) (Saran). Conclusively, the plasma polymer deposited from the mixture of TMOS and oxygen containing 60 mol % O₂ is a material with good oxygen barrier properties. © 1997 John Wiley & Sons, Inc. J Appl Polym Sci 64: 1031–1039, 1997     

炭黑填充复合型导电聚合物的压阻特性

总结了炭黑填充复合型导电聚合物的压阻特性与炭黑导电网络、压力和时间等条件的关系,阐述了加工工艺参数、导电填料、基体性质等对导电聚合物压阻特性的影响,并介绍了通过加入SiO2纳米材料或适当交联基体等改善压阻特性重复性和稳定性的方法.     

纳米SiOx/环氧树脂复合材料性能研究

以纳米SiOx为改性材料，采用浇铸工艺制备了纳米SiOx／环氧树脂复合材料。探讨了纳米复合材料的分散工艺方法以及不同的纳米SiOx含量对复合材料力学性能和耐热性能的影响。结果表明，当纳米材料质量分数为1％时，复合材料的分散效果好，拉伸强度和断裂伸长率提高到3倍，无缺口冲击强度达11．6kJ/m^2，洛氏硬度和耐热性能也有提高。     

硅/氧化硅/锡/碳锂离子电池负极复合材料制备及电化学性能

以一氧化硅、二氧化锡和导电碳(Super P)为原料,通过高能球磨,加入稀盐酸与糠醇发生聚合反应,再采用高温固相法制得硅/氧化硅/锡/碳复合材料作为锂离子电池负极材料.用 XRD、SEM 进行表征,并进行有关电化学性能测试,首次放电比容量高达 1503 mAh·g<'-1>,循环性能得到了较大改善.     

抗菌纳米SiOx粉体应用于PVC试验研究

自制抗菌纳米SiOx粉体添加于聚氯乙烯（PVC）基材制备PVC/SiOx复合抗菌材料,当抗菌纳米SiOx添加量为1 %（质量分数,下同）时,制备的复合抗菌材料对大肠杆菌和金黄色葡萄球菌的杀菌率分别达到92 %和89 %。复合抗菌材料具有良好的抗菌长效性且在力学性能上有较大提高,其拉伸强度和冲击强度分别提高了66.3 %和124.1 %。抗菌纳米SiOx粉体在PVC中的分散良好。     

Microwave absorption properties of Ni/(C, silicides) nanocapsules

ABSTRACT: The microwave absorption properties of Ni/(C, silicides) nanocapsules prepared by an arc discharge method have been studied. The composition and the microstructure of the Ni/(C, silicides) nanocapsules were determined by means of X-ray diffraction, X-ray photoelectric spectroscopy, and transmission electron microscope observations. Silicides, in the forms of SiOx and SiC, mainly exist in the shells of the nanocapsules and result in a large amount of defects at the 'core/shell' interfaces as well as in the shells. The complex permittivity and microwave absorption properties of the Ni/(C, silicides) nanocapsules are improved by the doped silicides. Compared with those of Ni/C nanocapsules, the positions of maximum absorption peaks of the Ni/(C, silicides) nanocapsules exhibit large red shifts. An electric dipole model is proposed to explain this red shift phenomenon.