Teflon－AF~R──新一代的电子和光电功能聚合物材料

ＴｅｆｌｏｎＡＦ是新一代高性能的Ｔｅｆｌｏｎ氟碳树脂。完全非晶态的ＴｅｆｌｏｎＡＦ具有许多突出优点，如在１９０ｎｍ厚度内的完全透明度，低折射率（１．２９～１．３１）；突出的介电性能（在塑料家族中具有最低的介电常数）；良好的力学性能；宽温区的热性能和优良的化学惰性及在选定的全氟化溶剂内受限制的溶解性等等。ＴｅｆｌｏｎＡＦ在高科技领域中具有广泛的应用前景。如用作在光纤和集成光学方面的重要材料，半导体和工艺材料，介电和释放材料，特殊性能的化学和工业材料以及生物医学材料等。     

静电粉末喷涂用聚三氟氯乙烯

综述了静电粉末喷涂用聚三氟氧乙烯的性能、合成方法及市场价值。从引发剂、乳化剂、pH缓冲剂等方面，详尽讨论了静电粉末喷涂用聚三氟氯乙烯的研究进展，总结了国内聚三氟氯乙烯存在的问题并提出了解决办法。     

含氟聚合物的合成概述

概述了无定型含氟树脂、可熔性聚四氟乙烯（PFA）、热塑性氟塑料THV、聚偏氟乙烯（PVDF）等含氟聚合物新品种的性能和合成方法。     

Interphases in the Adhesive Bonding of Fluoropolymers

Strong and durable adhesive bonds may be made between polytetrafluoroethylene (PTFE) and either cyanoacrylate (CA) or epoxy adhesives, if the PTFE surface is modified by the use of a “primer” such as triphenylphosphine (TPP) or diaminodiphenylmethane (DDM). The primer mixes with the PTFE surface, and the modified surface is then capable of forming an interphase, tens to hundreds of nanometers thick, where interpenetration of the adhesive and adherend occurs. Using CA adhesives, PTFE/CA/PTFE block compression shear bond strength (ASTM D4501-85) of over 10 MPa can be achieved, with failure occurring cohesively. Initial work with epoxy adhesives indicates that the use of DDM primer gives adhesive bonds comparable in strength with those produced by modification of the fluoropolymer surface by sodium naphthalenide.     

3‐D Printing and Development of Fluoropolymer Based Reactive Inks

Engineering reactive materials is an ever present goal in the energetics community. The desire is to have energetics configured in such a manner that performance is tailored and energy delivery can be targeted. Additive manufacturing (3‐D printing) is one area that could significantly improve our capabilities in this area, if adequate formulations are developed. In this paper, fluoropolymer based reactive inks are developed with micron (mAl) and nanoscale aluminum (nAl) serving, as the fuel at high solids loading (up to 67 wt%) and their viscosity required for 3‐D printing is detailed. For the pen‐type technique and valves used in this work, it is required to have viscosities on the order of 10⁴–10⁵ cP. For printed traces with apparent diameters under <500 μm, the combustion velocities for both micron and nano scale aluminum formulations, are approximately identical: 30 ± 3 versus 32 ± 2 mm s^?1, respectively. Further increasing the apparent diameter is shown to increase the combustion velocity in the case of the nanoscale aluminum formulation by four‐fold over that of the micron scale aluminum formulation, but it plateaus as it approaches an apparent diameter of 2 mm. The results suggest with proper architecture that tailorable combustion rates and energy delivery are feasible.

     

Polymer brush coatings for combating marine biofouling

A variety of functional polymer brushes and coatings have been developed for combating marine biofouling and biocorrosion with much less environmental impact than traditional biocides. This review summarizes recent developments in marine antifouling polymer brushes and coatings that are tethered to material surfaces and do not actively release biocides. Polymer brush coatings have been designed to inhibit molecular fouling, microfouling and macrofouling through incorporation or inclusion of multiple functionalities. Hydrophilic polymers, such as poly(ethylene glycol), hydrogels, zwitterionic polymers and polysaccharides, resist attachment of marine organisms effectively due to extensive hydration. Fouling release polymer coatings, based on fluoropolymers and poly(dimethylsiloxane) elastomers, minimize adhesion between marine organisms and material surfaces, leading to easy removal of biofoulants. Polycationic coatings are effective in reducing marine biofouling partly because of their good bactericidal properties. Recent advances in controlled radical polymerization and click chemistry have also allowed better molecular design and engineering of multifunctional brush coatings for improved antifouling efficacies.     

含氟聚碳酸酯的合成及其物性研究

用２，２－二（４－羟基苯）－１，１，１，３，３，３－六氟代丙烷和氯甲酸三氯甲酯（ＴＣＦ）进行缩合聚合，同时将上述两种单体与２，２，－二（４－羟基苯）丙烷（双酚Ａ）进行三元共聚合，然后测定聚合物的性能。实验结果表明，由于氟元素的引入，使聚合物的溶解性上升、表面能降低耐热性提高、折射率下降，使聚合物薄膜的柔软性增加、极限伸长率显著提高．     

印制版天线用常温固化氟碳涂料的研制

介绍了印制版天线用氟碳涂料的性能要求及其组成,重点讨论了氟碳树脂、固化剂和助剂对涂膜性能的影响,并用红外光谱手段对氟碳涂料的常温固化进行了跟踪。通过对比,选用常熟中昊氟碳树脂、N-3390固化剂、二丁基二月桂酸锡促进剂、BYK-161润湿分散剂、二甲苯和醋酸丁酯混合溶剂体系制备得到的常温固化氟碳涂料具有优异的耐候性、“三防”性、物理机械性能和透波性,对天线金属贴片和介质基板保护性良好。     

Laser-Enhanced Gas Phase Surface Modifications of Teflon AF1600 for Increased Copper Adhesion

Multilevel interconnect devices, made of alternating layers of a low permittivity polymer (e.g., Teflon AF1600^TM) and a low resistivity metal (e.g., copper), are increasingly being used in microelectronics in order to decrease the RC signal transmission time delay. The mechanical stability of the multilevel interconnects is related to the adhesion developed at the metal-dielectric interface. Since Cu/Teflon AF1600 adhesion is moderate and may not satisfy the requirements of the microelectronics industry, new treatments of the fluoropolymer surface are needed to improve it. In this note, we present several surface modifications, such as the formation of reactive sites during intense X-ray exposure, and S- or N-grafting, activated by UV radiation in the presence of H₂S and NH₃; copper is well known to react with both thiols (R—SH) and amines (R—NH₂) to form strong bonds. Both X-ray exposure and N-grafting lead to enhanced adhesion.     

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。