Plasma-deposited fluoropolymer film mask for local porous silicon formation

ABSTRACT: The study of an innovative fluoropolymer masking layer for silicon anodization is proposed. Due to its high chemical resistance to hydrofluoric acid even under anodic bias, this thin film deposited by plasma has allowed the formation of deep porous silicon regions patterned on the silicon wafer. Unlike most of other masks, fluoropolymer removal after electrochemical etching is rapid and does not alter the porous layer. Local porous regions were thus fabricated both in p+-type and low-doped n-type silicon substrates.     

On the thickness and spatial distribution of a fluoropolymer film deposited by solution dipping

Poly-1H,1H-pentadecafuorooctyl methacrylate is a barrier compound used to prevent silicone oil from creeping to relay contacts. It is essentially a methyl methacrylate polymer with a fluorocarbon side chain substituted for one of the methyl hydrogens. It is applied by dipping the part into a solution, with Freon TF as the solvent and the fluorocarbon polymer as the solute. This work considers the spatial distribution of the resulting film of barrier compound when it is deposited in this manner. The specific variables considered are concentration and withdrawal velocity. The samples were withdrawn from the solution with velocity perpendicular to the surface, and we show that the macrosopic uniformity and thickness of the film is dependent on this velocity. There exists a critical velocity (dependent on concentration) above which the film is nonuniform and below which the film is macroscopically uniform. Below the critical velocity, the thickness varies with velocity with approximately a v^2/3 dependence. The critical velocity is about 13 mm/sec for a concentration of 0.2%. For macroscopically uniform films, a microscopic nonunitormity exists with a coverage of about 1/4 for an average film thickness of 90 Å.     

疏水疏冰涂层的研究进展

介绍了描述液滴润湿性的Young、Wenzel和Cassie模型,概述了静、动态疏水性与疏冰之间的关系,综述了疏水疏冰涂层的制备方法,以及冰粘接强度的主要影响因素和测量方法,指出了疏水疏冰涂层将来的研究方向.     

含氟聚合物及其涂料

0404017硬度、耐候性、防污性以及其他成分相容性均好的氟共聚物涂料组合物:w003一106 516【国际专利申请,日]旧本:Daikin Industries,Ltd·(Yonei,Yasushi等)一2003.12.24一51页一JP2002/312934(2002.10.28);IPC C08F214/26 基于氟共聚物的题述涂料组合物含(A)四氟乙烯20%一49     

含氟聚合物及其涂料

0402014氟聚物粒子非水分散体组合物及其涂覆的物品:JP20O3一213 062旧本专利公开]旧本:3MInnovative ProPerties Co.(Kobayashi,Mitsuaki等)一2003.7.30一8页一2002/10 632(2002.1.18);IPCC08L27/12 可提高金属、无机物制品等的润湿性的该分解体含有一种质子惰性的有机极性溶剂(如N--甲基毗咯烷酮)、氟聚物粒子[如Dyneon pEA 6900N(全氟丙基乙烯基醚一四氟乙烯共聚物)〕和该氟聚物粒子用的分散剂。其中的分解剂是氟化脂族聚合物醋或聚(氧乙烯)二丙基胺,可溶于该质子惰性有机极性溶剂中。用该分散体组合物涂覆表面经预处理过的材料(…     

Multimodal fluoropolymer dispersions

Fluoropolymers are continuously increasing their application fields in many industrial areas because of their unique properties, such as heat and chemical resistance, high purity, lubricity, dielectric properties etc. [Encyclopedia of Chemical Technology, vol. 11, 3rd ed., Wiley, New York, 1980, p. 1]. This paper describes very promising results obtained thanks to the Ausimont proprietary technology of microemulsion polymerization in formulating bimodal and multimodal fluoropolymer dispersions with superior film forming behavior. Very carefully size-controlled nanoparticles, ranging from 10 to 60 nm, allow to obtain blend with 200–250 nm particles that not only do have highly improved film formation properties, but also show outstanding film characteristics with respect to conventional 200/110 nm bimodal PTFE latexes. Moreover, the high flexibility in selecting polymer characteristics such as molecular weight, particle shape, monomer composition and melting properties allows to have sintered films with a denser and tougher structure characterized by superior mechanical and barrier properties.     

含氟聚合物及其涂料

0403013氟树脂涂料耐腐蚀及耐老化性能〔刊1/潘文艳等//现代涂料与涂装一2004,(3)一42一440403014氟碳涂料的应用研究进展和市场【刊卫徐兆瑜刀现代涂料与涂装一2004,(3)一30~3504030巧氟碳涂料在舰船上的应用前景吁d]/杨光付等刀现代涂料与涂装一2004,(3)一36一38含氟聚合物及其涂料~~     

含氟聚合物及其涂料

0405029含氟聚合物型斥水、斥油剂及其生产方法:JPZoo4一75 736[日本专利公开]l日本:Nikk。Materials Co.,Lul.(Kum铭aya,Masashi等)一2004·3.11一8页一2002/234 538(2002.8.12):IPC C09K3/18 题述助剂是通过含全氟基团的不饱和化合物均聚或含全氟基团的不饱和化合物和其他不饱和单体在含轻氟醚和/或全氟醚的氟惰性溶剂中共聚而制得。例如,将13.3 9 M 1820甲基丙烯酸2一(全氟辛基)乙酷在70℃于HFE 72001一乙氧基全氟丁烷中共聚12h,得到ro%固体含量的聚合物溶液,将其中2%固体涂于一种AI 050P铝板上,水接触角为116“,庚烷接触角为59…     

Melt processible fluoropolymer composites

A series of melt-processible fluoropolymer compounds including ethylene-tetrafluoroethylene (ETFE), poly(vinylidene fluoride) (PVF₂), ethylene-chlorotrifluoroethylene copolymer (ECTFE), perfluoroalkoxy modified tetrafluoroethylene (PFA), and fluorinated ethylene-propylene copolymer (FEP) containing reinforcing glass fiber, milled glass fiber, carbon fiber, minerals, poly(tetrafluoroethylene) (PTFE) lubricant powder, graphite powder and MoS₂ were prepared and characterized. The mechanical, physical, thermal, and tribiological properties of these composites were compared and ranked for suitability in various applications. These composites represent the first comprehensive evaluation of reinforced and filled meltprocessible fluoropolymer composites.     

光学透明级对比度增强胶膜(CEF)的性能研究

报道了一种新型的光学透明级对比度增强胶膜CEF(Contrast Enhancement Film).并对CEF的对比度增强效果、光学性能和环境可靠性能做了研究.显示效果分析表明,粘贴CEF后,可以提高显示图像的时比度和亮度,特别是强光线条件下的对比度.光学性能测试结果表明,CEF具有优异的光学性能,其透光率大于99%...     

一种含氟聚合物乳液的分离过程

含氟聚合物乳液属于低浓度、高分散的非均相体系,为提高其分离效果,采用间歇式泡沫分离法研究含氟聚合物乳液的分离工艺。探索了搅拌器类型对分离效果的影响,试验结果表明:剪切作用对颗粒聚团的形成起主要作用,在同样的搅拌速度下,选用涡轮式搅拌器可以明显提高收率和富集比;比较了不同的通气方式对分离效果的影响,发现通入压缩空气可以显著提高收率和富集比。在上述条件下,运用均匀设计的方法研究通气量、温度、搅拌速度、搅拌时间、物料质量分数和氯化钙用量对分离效果的影响,利用DPS(数据处理系统)软件进行数据处理,确定乳液分离的最佳工艺条件为:通气量0.42 L/min,温度90℃,搅拌速度1 600 r/min,搅拌时间1.0 min,物料质量分数0.08,氯化钙用量0.000 2 g/mL,在此优化条件下进行验证试验,结果表明收率可达99%以上。     

含氟聚合物乳液的合成及应用

用含氟醇8.4g、丙烯酸1.5g对甲苯磺酸0.4g在N2气保护下于80-85℃进行酯化反应6-7h，制成含氟丙烯酸酯。含氟丙烯酸酯在复合乳化剂存在下分别进行均聚乳液聚合和共聚乳液聚合。再用制备的均聚、共聚乳液制成含氟聚合物乳胶漆，该漆除了具备一般丙烯酸酯漆的优点之外，还具有良好的防污、自洁、耐紫外线和耐候性，且对环境友好，是一种理想的外墙涂料。     

Degradation of thin films of a fluoropolymer

1H-1H-Pentadecafluorooctyl methacrylate, a fluoropolymer, is used as a barrier coating to control spreading of thin liquid films, notably silicone oil. Using infrared spectroscopy and thermogravimetric analysis, this work describes the thermal degradation of thin films of this fluoropolymer. The conclusions are that the degradation is a two-stage, thermal bond-breaking phenomenon which does not required an additional reactant such as oxygen or water vapor. Rate constant data are presented for both stages of the degradation.     

以含氟预聚物为助稳定剂的苯乙烯细乳液聚合

以苯乙烯(St)和甲基丙烯酸十二氟庚酯(G04)的无规共聚物(PSF)作为助稳定剂,进行St的细乳液聚合,考察了不同含氟量的PSF对转化率、聚合速率R_p、液滴粒径和成核粒子数的影响。结果表明,当含氟量由0增加到34.9%,转化率由67.5%增加到80.1%,R_p由0.75×10^-2 mol · L^-1·min^-1提高到1.74×10^-2 mol ·L^-1·min^-1;PSF的含氟量对细乳化后液滴粒径的影响较小,但对聚合过程中成核粒子数有较大影响。当含氟量由0增加到34.9%时,反应3 h后,体系成核粒子数由每升1.83×10^16个增加到2.07×10¹⁶个,并初步分析了PSF可以单独作为助稳定剂的作用机理。     

Increasing pelletizing extruder output with fluoropolymer alloys

Fluoropolymer processing additives are used by many polyolefin processors. Typical benefits include the reduction of die build-up and the elimination of shark-skin melt fracture. Improvements in this technology have led to the fluoropolymer alloy, the most efficient fluoropolymer additive available. This same fluoropolymer additive can be used to increase the output in a pelletizing extruder. The improved efficiency of the fluoropolymer alloy makes the improvement cost effective. This paper will show how this is being done. Results will be shown from polyethylene plants where these improvements have been demonstrated.     

On the corrosion protection properties of fluoropolymer coatings

Fluoropolymers have attained great importance as coating materials because of their excellent resistance to high temperature, chemicals and organic solvents. Electrochemical impedance spectroscopy was used to study the corrosion protection properties both on undamaged fluoropolymer coatings and on samples with an artificial defect. The experimental results were interpreted on the basis of a proposed equivalent electrical circuit which best fits the experimental impedance spectra. In this way we observed the high quality of the fluorinated coatings compared with that of the corresponding hydrogenated polymer used as a reference. The protective properties of the fluoropolymer coatings studied can be related to chemical (fluorine and chlorine functional groups) and physical (good order of the polymeric chains) characteristics of the resins.