Abstract:
This invention relates to a process for the synthesis of diacyl peroxide by contacting acyl halide and peroxide complex in liquid or supercritical carbon dioxide.
Abstract:
Novel copolymers of fluorinated olefins and maleic anhydride, maleic acid, dichloromaleic anhydride or dichloromaleic acid may be made by using as solvents for the maleic anhydride or acid a perfluorinated alkyl carboxylic acid, or liquid or supercritical hexafluoropropylene or carbon dioxide. The resulting polymers are useful as adhesives or compatibilizing agents for fluoropolymers, and in coatings.
Abstract:
Fluoropolymers containing a specified ratio of hydrogen to fluorine atoms attached to polymer backbone atoms dissolve in carbon dioxide under relatively mild conditions of temperature and pressure. The resulting solutions may be used for coatings or encapsulation.
Abstract:
Fluoroplastics become identifiable as to source by incorporating 1 to 450 ppm of inorganic phosphor into the fluoroplastic which does not degrade the fluoroplastic upon processing at a temperature of 300.degree. C. and does not discolor the fluoroplastic but does emit radiation which is characteristic of the phosphor when the fluoroplastic is exposed to excitation radiation.
Abstract:
A cathode catalyst layer used for a polymer electrolyte fuel cell that includes an electrolyte membrane is provided. The cathode catalyst layer comprises a catalyst having weight of not greater than 0.3 mg/cm2 of a reaction surface of the cathode catalyst layer that is adjoining the electrolyte membrane; and an electrolyte resin having oxygen permeability of not less than 2.2*10−14 mol/m/s/Pa in an environment of temperature of 80 degrees Celsius and relative humidity of 50%.
Abstract translation:提供了用于包含电解质膜的固体高分子型燃料电池的阴极催化剂层。 阴极催化剂层包含负极与电解质膜相邻的阴极催化剂层的反应面重量不大于0.3mg / cm 2的催化剂; 以及在80℃的温度和50%的相对湿度的环境中具有不低于2.2×10-14mol / m / s / Pa的透氧度的电解质树脂。
Abstract:
This invention relates to solid polymer electrolyte materials for use in one or more electrode of a fuel cell. The solid polymer electrolyte materials comprise one or more ionomer which comprises polymerized units of monomers A and monomers B, wherein monomers A are perfluoro dioxole or perfluoro dioxolane monomers, and the monomers B are functionalized perfluoro olefins having fluoroalkyl sulfonyl, fluoroalkyl sulfonate or fluoroalkyl sulfonic acid pendant groups, CF2═CF(O)[CF2]nSO2X. The ionomer of the solid polymer electrolyte material has a number average molecular weight, Mn, of greater than 140,000. Specifically, the ionomers of the invention may find use in the catalyst layer of an electrode because the high molecular weight ionomers mitigate the formation of cracks in the catalyst layer.
Abstract translation:本发明涉及用于燃料电池的一个或多个电极的固体聚合物电解质材料。 固体聚合物电解质材料包含一种或多种离聚物,其包含单体A和单体B的聚合单元,其中单体A是全氟二氧杂环戊烯单体或全氟二氧戊环单体,单体B是具有氟代烷基磺酰基,氟烷基磺酸酯或氟烷基磺酸的全氟烯烃的官能化 侧链基团,CF 2 = CF(O)[CF 2] n SO 2 X。 固体高分子电解质材料的离聚物的数均分子量Mn大于14万。 具体地,本发明的离聚物可用于电极的催化剂层,因为高分子量离聚物可以减轻催化剂层中的裂纹的形成。
Abstract:
Methods for purifying liquid alkanes are provided. The methods produce alkanes having low absorbance, particularly at 193 nm. The alkane liquids are useful as immersion liquids in photomicrolithography employed for production of electronic circuits.
Abstract:
A one or two layer coating system has been developed for plastic substrates. The one coating system low reflective layer consists of a fluorinated copolymer having the formula: VF2/TFE/HFP, VF2/HFP or VF2/TFE/PMVE. In the two coating system, the upper coating layer consists of TFE/HFP, VF2/TFE/HFP, or TFE/Perfluorodioxole, and the lower coating layer consists of VF2/TFE/HFP, VF/TFE/HFP, VAc/TFE/HFIB, or TFE graft to PVOH.
Abstract:
This invention concerns liquid perfluoro-n-alkanes for use in applications demanding high transparency at UV wavelengths ranging from about 150 to 165 nm, especially 157 nm. Uses include optical couplants, optical cements, optical elements, optical inspection media for semiconductor wafers and devices, and most especially immersion photolithography at 157 nm exposure wavelength.
Abstract:
Methods for purifying liquid alkanes are provided. The methods produce alkanes having low absorbance, particularly at 193 nm. The alkane liquids are useful as immersion liquids in photomicrolithography employed for production of electronic circuits.