含氟聚合物的辐射交联Ⅱ——氟塑料-46的辐射交联反应机理

根据红外分析、顺磁共振、光电子能谱及化学分析结果,我们提出了氟塑料—46的辐射交联反应机理。交联点不一定如Bowers等由理论分析推断的在氟塑料—46的—CF_3侧链上。我们认为可以由 CF_3链侧自由基如—CF_2—CF—CF_2—,—CF_2—C—CF_2—,直接复合成交联键,H型交联;或由链侧自由基和链端自由基复合通过支化而交联,即T型或Y型交联。后者机率更多些。     

含氟聚合物聚合反应釜传质能力改善

介绍了含氟聚合物聚合反应釜传质能力改善的方法：将聚合反应釜的推进式和锚式的组合体搅拌更换为涡轮式和锚式的组合体；延长挡板，缩短与反应釜釜盖的距离。改善前后生产的聚合物的分子量及其分布的变化也证实反应釜传质能力的提高。     

Epoxidized perfluoropolyethers: A route to hydrophobic,negative‐tone photoresists

The synthesis, formulation, and wafer level processing conditions of a heavily fluorinated hydrophobic photoresist was demonstrated. The synthesis is based on terminal epoxy modification of commercially available perfluoropolyethers. Structural characterization shows that terminal epoxide can open during the synthetic process, but in a simple formulation has a negligible effect on photoresolution of the photoresist. Formulation into a traditional photoresist requires careful selection of appropriate cosolvents to ensure solubility of the hydrophobic epoxy and hydrophilic photoacid generator while attaining adequate coating quality. Formulation processing conditions are presented and the chemical resistance of the resist through aggressive processing steps is demonstrated. Wafer level patterning using traditional photolithographic tools illustrates the applicability of the formulation and process conditions for traditional resist or microfluidic applications. © 2011 Wiley Periodicals, Inc. J Appl Polym Sci, 2011     

Synthesis and characterization of fluoropolymer modified polyacrylate in emulsion polymerization

A novel method to produce fluorine‐containing polyacrylate emulsion is presented. It is prepared by the copolymerization of n‐methyl methacrylate, n‐styrene, n‐butyl acrylate, and α‐methacrylic acid in the presence of swollen particles of PTFE. The structure and properties of the polymers are characterized by GPC, PSD, SEM, and XPS. The number‐average molar mass (Mn) 51,332, and the polydispersity 5.8688 are obtained. The mean diameter of latex particles is 300nm. Scanning electron microscopy reveals that particles of the emulsion are well dispersed. Meanwhile, the F_1S content of the surface on the latex membrane is 8.99%. It is shown that the method of mixing micron and nanometer‐sized particles should be made the next step of research. It is also proved that inertia polymers can be used in emulsion property modification. © 2005 Wiley Periodicals, Inc. J Appl Polym Sci 99: 558–562, 2006     

氟碳涂料研究及发展趋势

概述了氟碳涂料的发展过程,并对不同发展阶段的氟碳涂料作了简单介绍。重点阐述了乙烯与三氟氯乙烯共聚物(E-CTFE)涂料、端羟基全氟聚醚(PFPE)树脂涂料、氟乙烯烃基乙烯基醚共聚物(PFEVE)涂料、丙烯酸改性氟聚合物(AMF)涂料等几种典型氟碳涂料的制备与基本性能。同时指出了氟碳涂料的发展方向。     

Molecular transport of organic esters and ketones into fluoropolymer membranes

The effect of different fluorine contents of DuPont VITON fluoropolymers and their transport characteristics in the presence of phenyl acetate, diethyl oxalate, diethyl malonate, diethyl succinate, acetone, methyl ethyl ketone and methyl iso-butyl ketone has been investigated over the temperature interval of 25?60°C. The average values of diffusion coefficients are obtained from the Fickian relation and the molecular transport is found to follow an anomalous behavior. Kinetic rate constants and pentration velocities are also calculated. The experimental results and the calculated quantities are studied in terms of polymer-solvent interactions.     

High air stability of threshold voltage on gate bias stress in pentacene TFTs with a hydroxyl-free and amorphous fluoropolymer as gate insulators

We investigated the air stabilities of threshold voltages (V_th) on gate bias stress in pentacene thin-film transistors (TFTs) with a hydroxyl-free and amorphous fluoropolymer as gate insulators. The 40-nm-thick thin films of spin-coated fluoropolymer had excellent electrical insulating properties, and the pentacene TFTs exhibited negligible current hysteresis, low leakage current, a field-effect mobility of 0.45 cm²/Vs and an on/off current ratio of 3 × 10⁷ when it was operated at −20 V in ambient air. After a gate bias stress of 10⁴ s, a small V_th shift below 1.1 V was obtained despite non-passivation of the pentacene layer. We have discussed that the excellent air stability of V_th was attributed to the insulator surface without hydroxyl groups.     

含氟聚合物纳米SiO2复合涂层的制备及性能研究

以1-甲基丙烯酰氧基丙基三甲氧基硅烷(MPTMS)、N-甲基全氟辛基磺酰基胺基丙烯酸乙酯(MPSAEA)、甲基丙烯酸甲酯(MMA)共聚，然后利用原位复合技术引入纳米SiO2微粒，制备了均匀透明的SiO2纳米复合含氟聚合物材料。用红外光谱(FT—IR)、透射电镜(TEM)和电子衍射(ED)等表征了复合材料的形貌和结构。将聚合物用做涂层材料，用扫描电镜(SEM)、X-射线光电子能谱(XPS)、接触角测定仪和显微硬度仪测定了涂层的形貌、涂层表面的化学成分、涂层与水的接触角随时间的变化、涂层的硬度变化，结果表明纳米复合聚合物可在玻片表面形成均匀光滑的涂层，涂层表面纳米SiO2和含氟成分共同存在，纳米SiO2复合涂层在室外放置半年以后仍保持良好的疏水性，并且纳米复合聚合物涂层的硬度随含氟单体含量的增加而增加。     

聚偏氟乙烯树脂性能和加工应用

聚偏氟乙烯具有优异的介电性能和抗老化性能,良好的耐热、耐腐蚀性能,可采用挤出、注塑、模塑、传递模塑等方法加工成型,其制品有薄膜、滤布、隔膜、衬里衬板、管道和配件等,广泛应用于化工、电子电气、建筑、军工等领域。     

Evaluation of the anti-fouling properties of nm thick atmospheric plasma deposited coatings

Both organic and inorganic fouling are significant problems for stainless steel surfaces used in industrial applications as diverse as shipping and paper making. The objective of this study is to evaluate the anti-fouling properties of a range of fluoropolymer, fluorinated and non-fluorinated siloxane coatings on stainless steel substrates. These nm thick coatings were deposited using the atmospheric plasma jet system called PlasmaStream™. The surface properties of the plasma polymerised coatings were examined using optical profilometry, SEM-EDX, ellipsometry, contact angle measurement and FTIR. Accelerated wear testing of the coated heat exchangers indicated that coating durability was a significant issue for the nanometre thick coatings investigated. A crystallization fouling study was carried out using a laboratory scale heat exchanger test apparatus. In this the heated steel surface was in contact with flowing fluid containing CaCO₃ particles. The coated steel exhibited both a delay before fouling was initiated and in addition a decrease in the fouling rate. A lubricant oil fouling study was also carried out involving a comparison between both coated and uncoated stainless steel separator discs over a 30 day period, in the engine of a passenger ferry. A significant reduction in the level of oil fouling was observed for the fluorosiloxane and fluoropolymer coated separator discs compared with the uncoated discs.