3-氟-4-氰基苯酚的合成

以间氟苯酚为原料 ,β-环糊精为定位剂 ,经碘化、氰化合成 3-氟 - 4-氰基苯酚。研究了反应因素如温度、p H、催化剂、溶剂等对收率的影响。结果表明 :碘化过程中 ,反应温度控制在 0～ 5℃之间 ,环糊精投入量为间氟苯酚量 2倍时 ,碘化产率可达 90 %以上 ;氰化过程中 ,反应温度控制在 1 2 0℃左右 ,三氯化铁作催化剂 ,DMF作反应溶剂时 ,碘化产率可达 70 %以上     

双酚AF硫化体系的硫化特性分析

研究了双酚AF硫化体系对氟橡胶硫化特性的影响。研究表明采用双酚AF硫化体系对胶料的加工性能无任何影响；在硫化体系中，BPP（苄基三苯基氯我）对胶料硫化特性的影响较双酚AF更为明显。本文的研究结果为高性能氟橡胶混炼胶的设计提供依据。     

3-(4-氯-2-氟-5-甲氧基苯基)-1-甲基-5-三氟甲基-1H-吡唑的合成

3 (4 氯 2 氟 5 甲氧基苯基 ) 1 甲基 5 三氟甲基 1H 吡唑是合成除草剂的中间体。它通过以下途径制得 :邻氯对氟苯甲醚在冰水浴下与甲基二氯甲基醚和四氯化钛反应得 4 氯 2 氟 5 甲氧基苯甲醛 ;后者经甲基格氏试剂作用 ,然后在酸性条件下用三氧化铬氧化 ,转变为 4 氯 2 氟 5 甲氧基苯乙酮 ;4 氯 2 氟 5 甲氧基苯乙酮在甲醇钠 /甲醇体系中 ,与三氟乙酸乙酯反应得相应的 β 二酮 ;然后用水合肼闭环 ,再用硫酸二甲酯甲基化即得产品。总收率 6 3 5 %。最后一步用硫酸二甲酯甲基化时 ,反应在酸性条件下进行可减少副产品的生成。产品结构经质谱、核磁共振氢谱、碳谱确认     

新型改性氟材料滑动零部件的研制

对专用于制作滑动零部件新型改性氟材料的组成、加工以及摩擦磨损性能进行研究，从而得出改性氟材料专用料具有优异的摩擦、磨损性能、特别适合制作滑动零部件。     

国外氟橡胶产品介绍

介绍了氟橡胶的发展和许多新品级氟橡胶的开发，氟橡胶已应用到各种不同的场合。     

水刺非织造布的防水整理

简述了水刺非织造布防水整理的工作原理 ,并通过对几种防水剂的筛选 ,确定了有机氟类防水剂为最佳防水剂及其防水整理的典型工艺。     

Investigation of the nanocellular foaming of polystyrene in supercritical CO2 by adding a CO2‐philic perfluorinated block copolymer

Nanocellular foaming of polystyrene (PS) and a polystyrene copolymer (PS‐b‐PFDA) with fluorinated block (1,1,2,2‐tetrahydroperfluorodecyl acrylate block, PFDA) was studied in supercritical CO₂ (scCO₂) via a one‐step foaming batch process. Atom Transfer Radical Polymerization (ATRP) was used to synthesize all the polymers. Neat PS and PS‐b‐PFDA copolymer samples were produced by extrusion and solid thick plaques were shaped in a hot‐press, and then subsequently foamed in a single‐step foaming process using scCO₂ to analyze the effect of the addition of the fluorinated block copolymer in the foaming behaviour of neat PS. Samples were saturated under high pressures of CO₂ (30 MPa) at low temperatures (e.g., 0°C) followed by a depressurization at a rate of 5 MPa/min. Foamed materials of neat PS and PS‐b‐PFDA copolymer were produced in the same conditions showing that the presence of high CO₂‐philic perfluoro blocks, in the form of submicrometric separated domains in the PS matrix, acts as nucleating agents during the foaming process. The preponderance of the fluorinated blocks in the foaming behavior is evidenced, leading to PS‐b‐PFDA nanocellular foams with cell sizes in the order of 100 nm, and bulk densities about 0.7 g/cm³. The use of fluorinated blocks improve drastically the foam morphology, leading to ultramicro cellular and possibly nanocellular foams with a great homogeneity of the porous structure directly related to the dispersion of highly CO₂‐philic fluorinated blocks in the PS matrix. © 2012 Wiley Periodicals, Inc. J Appl Polym Sci, 2012